RIFT Auto-EVPN
draft-ietf-rift-auto-evpn-05
| Document | Type | Active Internet-Draft (rift WG) | |
|---|---|---|---|
| Authors | Jordan Head , Tony Przygienda , Wen Lin | ||
| Last updated | 2024-02-29 | ||
| Replaces | draft-head-rift-auto-evpn | ||
| RFC stream | Internet Engineering Task Force (IETF) | ||
| Intended RFC status | (None) | ||
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| Additional resources | Mailing list discussion | ||
| Stream | WG state | WG Document | |
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| Send notices to | (None) |
draft-ietf-rift-auto-evpn-05
RIFT J. Head, Ed.
Internet-Draft T. Przygienda
Intended status: Standards Track W. Lin
Expires: 1 September 2024 Juniper Networks
29 February 2024
RIFT Auto-EVPN
draft-ietf-rift-auto-evpn-05
Abstract
This document specifies procedures that allow an EVPN overlay to be
fully and automatically provisioned when using RIFT as underlay by
leveraging RIFT's no-touch ZTP architecture.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
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This Internet-Draft will expire on 1 September 2024.
Copyright Notice
Copyright (c) 2024 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
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Please review these documents carefully, as they describe your rights
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provided without warranty as described in the Revised BSD License.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Requirements Language . . . . . . . . . . . . . . . . . . 3
2. Design Considerations . . . . . . . . . . . . . . . . . . . . 4
3. Auto-EVPN Device Roles . . . . . . . . . . . . . . . . . . . 4
3.1. All Participating Nodes . . . . . . . . . . . . . . . . . 4
3.2. ToF Nodes as Route Reflectors . . . . . . . . . . . . . . 5
3.2.1. Data Center Interconnect Gateway Functions . . . . . 5
3.3. Leaf Nodes . . . . . . . . . . . . . . . . . . . . . . . 6
4. Auto-EVPN Variable Derivation . . . . . . . . . . . . . . . . 7
4.1. RIFT System ID . . . . . . . . . . . . . . . . . . . . . 7
4.2. Auto-EVPN Version . . . . . . . . . . . . . . . . . . . . 7
4.3. RIFT Fabric ID . . . . . . . . . . . . . . . . . . . . . 8
4.4. Auto-EVPN Model . . . . . . . . . . . . . . . . . . . . . 8
4.5. MAC-VRF ID . . . . . . . . . . . . . . . . . . . . . . . 8
4.6. Loopback Address . . . . . . . . . . . . . . . . . . . . 9
4.6.1. Leaf Nodes as Gateways . . . . . . . . . . . . . . . 9
4.6.2. ToF Nodes as Route Reflectors . . . . . . . . . . . . 9
4.6.2.1. Single Plane Route Reflector Election
Procedures . . . . . . . . . . . . . . . . . . . . 10
4.6.2.2. Multiplane Route Reflector Election Procedures . 11
4.7. Autonomous System Number . . . . . . . . . . . . . . . . 11
4.8. Router ID . . . . . . . . . . . . . . . . . . . . . . . . 11
4.9. Cluster ID . . . . . . . . . . . . . . . . . . . . . . . 12
4.10. Route Target . . . . . . . . . . . . . . . . . . . . . . 12
4.11. Route Distinguisher . . . . . . . . . . . . . . . . . . . 12
4.12. EVPN MAC-VRF Services . . . . . . . . . . . . . . . . . . 12
4.12.1. Untagged Traffic in Multiple Fabrics . . . . . . . . 13
4.12.1.1. VLAN . . . . . . . . . . . . . . . . . . . . . . 13
4.12.1.2. VNI . . . . . . . . . . . . . . . . . . . . . . 13
4.12.1.3. MAC Address . . . . . . . . . . . . . . . . . . 13
4.12.1.4. IPv6 IRB Gateway Address . . . . . . . . . . . . 13
4.12.1.5. IPv4 IRB Gateway Address . . . . . . . . . . . . 14
4.12.2. Tagged Traffic in Multiple Fabrics . . . . . . . . . 14
4.12.2.1. VLAN . . . . . . . . . . . . . . . . . . . . . . 14
4.12.2.2. VNI . . . . . . . . . . . . . . . . . . . . . . 14
4.12.2.3. MAC Address . . . . . . . . . . . . . . . . . . 14
4.12.2.4. IPv6 IRB Gateway Address . . . . . . . . . . . . 15
4.12.2.5. IPv4 IRB Gateway Address . . . . . . . . . . . . 15
4.12.3. Tagged Traffic in a Single Fabric . . . . . . . . . 15
4.12.3.1. VLAN . . . . . . . . . . . . . . . . . . . . . . 15
4.12.3.2. VNI . . . . . . . . . . . . . . . . . . . . . . 15
4.12.3.3. MAC Address . . . . . . . . . . . . . . . . . . 16
4.12.3.4. IPv6 IRB Gateway Address . . . . . . . . . . . . 16
4.12.3.5. IPv4 IRB Gateway Address . . . . . . . . . . . . 16
4.12.4. Traffic Routed to External Destinations . . . . . . 16
4.12.4.1. Route Distinguisher . . . . . . . . . . . . . . 16
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4.12.4.2. Route Target . . . . . . . . . . . . . . . . . . 17
5. RIFT Requirements . . . . . . . . . . . . . . . . . . . . . . 17
5.1. RIFT FSM / LIE Validation Requirements . . . . . . . . . 17
5.2. RIFT Node-TIE Advertisements . . . . . . . . . . . . . . 17
6. Operational Considerations . . . . . . . . . . . . . . . . . 17
6.1. RIFT Underlay and Auto-EVPN Overlay . . . . . . . . . . . 17
6.2. Auto-EVPN Analytics . . . . . . . . . . . . . . . . . . . 20
6.2.1. Auto-EVPN Analytics (Global) Key/Value Pair . . . . . 20
6.2.2. Auto-EVPN Analytics (MAC-VRF) Key/Value Pair . . . . 21
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 23
8. Security Considerations . . . . . . . . . . . . . . . . . . . 23
9. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 24
10. References . . . . . . . . . . . . . . . . . . . . . . . . . 24
10.1. Normative References . . . . . . . . . . . . . . . . . . 24
Appendix A. YANG Model . . . . . . . . . . . . . . . . . . . . . 24
Appendix B. Thrift Models . . . . . . . . . . . . . . . . . . . 24
B.1. common.thrift . . . . . . . . . . . . . . . . . . . . . . 25
B.2. encoding.thrift . . . . . . . . . . . . . . . . . . . . . 25
B.3. common_evpn.thrift . . . . . . . . . . . . . . . . . . . 26
B.4. auto_evpn_kv.thrift . . . . . . . . . . . . . . . . . . . 29
Appendix C. Auto-EVPN Variable Derivation . . . . . . . . . . . 31
C.1. Variable Derivation Functions . . . . . . . . . . . . . . 31
C.2. Variable Derivation Results . . . . . . . . . . . . . . . 44
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 89
1. Introduction
RIFT is a protocol that focuses heavily on operational simplicity.
[RIFT] natively supports Zero Touch Provisioning (ZTP) functionality
that allows each node in an underlay network to automatically derive
its place in the topology and configure itself accordingly when
properly cabled. RIFT can also disseminate Key-Value information
contained in Key-Value Topology Information Elements (KV-TIEs)
[RIFT-KV]. These KV-TIEs can contain any information and therefore
be used for any purpose. Leveraging RIFT to provision EVPN overlays
without any need for configuration and leveraging KV capabilities to
easily validate correct operation of such overlay without a single
point of failure would provide significant benefit to operators in
terms of simplicity and robustness of such a solution.
1.1. Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119 [RFC2119].
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2. Design Considerations
EVPN supports various service models, this document defines a method
for the VLAN-Aware service model defined in [RFC7432]. Other service
models may be considered in future revisions of this document.
Each model has its own set of requirements for deployment. For
example, a functional BGP overlay is necessary to exchange EVPN NLRI
regardless of the service model. Furthermore, the requirements are
made up of individual variables, such as each node's loopback address
and AS number for the BGP session. Some of these variables may be
coordinated across each node in a network, but are ultimately locally
significant (e.g. route distinguishers). Similarly, calculation of
some variables will be local only to each device. RIFT contains
currently enough topology information in each node to calculate all
those necessary variables automatically.
Once the EVPN overlay is configured and becomes operational, RIFT
Key-Value TIEs can be used to distribute state information to allow
for validation of basic operational correctness without the need for
further tooling.
3. Auto-EVPN Device Roles
Auto-EVPN requires that each node understand its given role within
the scope of the EVPN implementation so each node derives the
necessary variables and provides the necessary overlay configuration.
For example, a leaf node performing VXLAN gateway functions does not
need to derive its own Cluster ID or learn one from the Route
Reflector that it peers with.
3.1. All Participating Nodes
Not all nodes have to participate in Auto-EVPN, however if a node
does assume an Auto-EVPN role, it MUST derive the following
variables:
*IPv6 Loopback Address*
Unique IPv6 loopback address used in BGP sessions.
*Router ID*
The BGP Router ID.
*Autonomous System Number*
The ASN for IBGP sessions.
*Cluster ID*
The Cluster ID for Top-of-Fabric IBGP route reflection.
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3.2. ToF Nodes as Route Reflectors
This section defines an Auto-EVPN role whereby some Top-of-Fabric
nodes act as Route Reflectors. It is expected that Route Reflectors
would establish IBGP sessions with leaf nodes in the same fabric.
The typical Route Reflector requirements do not change, however
determining which specific values to use requires further
consideration.
ToF nodes performing Route Reflector functionality MUST derive the
following variables:
*IPv6 RR Loopback Address*
The source address for IBGP sessions with leaf nodes in case
ToF won election for one of the Route Reflectors in the fabric.
*IPv6 RR Acceptable Prefix Range*
Range of addresses acceptable by the Route Reflector to form a
IBGP session. This range covers ALL possible IPv6 Loopback
Addresses derived by other Auto EVPN nodes in the current
fabric and other Auto-EVPN RRs addresses.
*Cluster ID*
The Cluster ID for Top-of-Fabric IBGP route reflection.
3.2.1. Data Center Interconnect Gateway Functions
Implementations that require connectivity beyond the EVPN/VXLAN
boundary can leverage Data Center Interconnect Gateway functionality.
This requires additional considerations to ensure the appropriate
reachability is present.
First - new VRFs and accompanying variable derivation is required,
this is decribed below.
Second - additional Route Reflector election considerations in order
to ensure that Route Reflectors with DCI gateway functionality are
preferred. This is described later in the document in Section 4.6.2.
If DCI functionality is desired, the Top-of-Fabric nodes MUST be
capable of routing toward the correct leaf node when it receives
traffic from an external destination. Therefore, it MUST be capable
of deriving the following types of variables:
*Route Distinguisher*
The route distinguisher corresponding to a IP-VRF's IP prefix
routes that MUST uniquely identify each node.
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*Route Target*
The route target that corresponds to an IP-VRF's IP prefix
routes.
*VNI*
The VNI that corresponds to the Type-5 IP prefix routes within
an IP-VRF.
3.3. Leaf Nodes
Leaf nodes derive their role from realizing they are at the bottom of
the fabric, i.e. not having any southbound adjacencies. Alternately,
a node can assume a leaf node if it has only southbound adjacencies
to nodes with explicit LEAF_LEVEL to allow for scenarios where RIFT
leaves do NOT participate in Auto-EVPN.
Leaf nodes MUST derive the following variables:
*IPv6 RR Loopback Addresses*
Addresses of the RRs present in the fabric. Those addresses
are used to build BGP sessions to the RR.
*EVIs*
Leaf node derives all the necessary variables to instantiate
EVIs with layer-2 and optionally layer-3 functionality.
If a leaf node is required to perform layer-2 VXLAN gateway
functions, it MUST be capable of deriving the following types of
variables:
*Route Distinguisher*
The route distinguisher corresponding to a MAC-VRF that
uniquely identifies each node.
*Route Target*
The route target that corresponds to a MAC-VRF.
*MAC VRF Name*
This is an optional variable to provide a common MAC VRF name
across all leaves.
*Set of VLANs*
Those are VLANs provisioned either within the fabric or
allowing to stretch across fabrics.
For each VLAN derived in an EVI the following variables MUST be
derived:
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*VLAN*
The VLAN ID.
*Name*
This is an optional variable to provide a common VLAN name
across all leaves.
*VNI*
The VNI that corresponds to the VLAN ID. This will contribute
to the EVPN Type-2 route.
*IRB*
Optional variables of the IRB for the VLAN if the leaf performs
layer-3 gateway function.
4. Auto-EVPN Variable Derivation
As previously mentioned, not all nodes are required to derive all
variables in a given network (e.g. a transit spine node may not need
to derive any or participate in Auto-EVPN). Additionally, all
derived variables are derived from RIFT's FSM or ZTP mechanism so no
additional flooding beside RIFT flooding is necessary for the
functionality.
It is also important to mention that all variable derivation is in
some way based on combinations of System ID, MAC-VRF ID, Fabric ID,
EVI, and VLAN and MUST comply precisely with calculation methods
specified in the Auto-EVPN Variable Derivation section to allow
interoperability between different implementations. All foundational
code elements are also mentioned there.
4.1. RIFT System ID
The 64-bit RIFT System ID that uniquely identifies a node as defined
in RIFT [RIFT].
4.2. Auto-EVPN Version
This section describes extensions to both the RIFT LIE and Node-TIE
packet schemas in the form of a 16-bit value that identifies the
Auto-EVPN Version. Auto-EVPN capable nodes MUST support this
extension, but MAY choose not to advertise it in LIEs and Node-TIEs
when Auto-EVPN is not being utilized.
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The complete encoding.thrift schema documented in RIFT [RIFT]
describes both major and minor protocol/schema versions. Auto-EVPN
Version calculation is done by multiiplying a static value of 256 by
the major version then adding the minor version, that is to say - 256
* MAJOR + MINOR.
This section also describes an extension to the NodeCapabilities
schema indicating whether or not a node supports Auto-EVPN.
The appendix (Appendix B) details described changes to the RIFT
LIEPacket, NodeTIEElement, and NodeCapabilities Thrift schemas.
4.3. RIFT Fabric ID
RIFT operates on variants of Clos substrate which are commonly called
an IP Fabric. Since EVPN VLANs can be either contained within one
fabric or span them, Auto-EVPN introduces the concept of a Fabric ID
into RIFT.
This section describes extensions to both the RIFT LIE and Node-TIE
packet schemas in the form of a 16-bit Fabric ID that identifies a
node's membership within a particular fabric. Auto-EVPN capable
nodes MUST support this extension but MAY not advertise it when not
participating in Auto-EVPN. A non-present Fabric ID and value of 0
is reserved as ANY_FABRIC and MUST NOT be used for any other purpose.
The appendix (Appendix B) details necessary changes to the RIFT
LIEPacket and NodeTIEElement Thrift schemas.
4.4. Auto-EVPN Model
This section describes extensions to the RIFT Node-TIE packet schema
that describe a particular EVPN model (e.g. VLAN-Aware).
The appendix (Appendix B) details necessary changes to the RIFT
NodeTIEElement Thrift schema.
4.5. MAC-VRF ID
This section describes a variable MAC-VRF ID that uniquely identifies
an EVPN Instance (EVI) and is used in variable derivation procedures.
Each EVPN EVI MUST be associated with a unique MAC-VRF ID, this
document does not specify a method for making that association or
ensuring that they are coordinated properly across fabric(s).
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4.6. Loopback Address
First and foremost, RIFT does not advertise anything more specific
than the fabric default route in the southbound direction by default.
However, Auto-EVPN nodes MUST advertise specific loopback addresses
southbound to all other Auto-EVPN nodes so to establish MP-BGP
reachability correctly in all scenarios.
Auto-EVPN nodes MUST derive a ULA-scoped IPv6 loopback address to be
used as both the IBGP source address, as well as the VTEP source when
VXLAN gateways are required. Calculation is done using the 6-bytes
of reserved ULA space, the 2-byte Fabric ID, and the node's 8-byte
System ID. Derivation of the System ID varies slightly depending
upon the node's location/role in the fabric and will be described in
subsequent sections.
4.6.1. Leaf Nodes as Gateways
Calculation is done using the 6-bytes of reserved ULA space, the
2-byte Fabric ID, and the node's 8-byte System ID.
In order for leaf nodes to derive IPv6 loopback addresses, algorithms
shown in both auto_evpn_fidsidv6loopback (Figure 28) and
auto_evpn_v6prefixfidsid2loopback (Figure 13) are required.
IPv4 addresses MAY be supported, but it should be noted that they
have a higher likelihood of collision. The appendix contains the
required auto_evpn_fidsid2v4loopback (Figure 27) algorithm to support
IPv4 loopback derivation.
4.6.2. ToF Nodes as Route Reflectors
ToF nodes acting as Route Reflectors MUST derive their loopback
address according to the specific section describing the algorithm.
Calculation is done using the 6-bytes of reserved ULA space, the
2-byte Fabric ID, and the 8-byte System ID of each elected Route
Reflector.
In order for the ToF nodes to derive IPv6 loopbacks, the algorithms
shown in both auto_evpn_fidsidv6loopback (Figure 28) and
auto_evpn_fidrrpref2rrloopback (Figure 14) are required.
In order for the ToF derive the necessary prefix range to facilitate
peering requests from any leaf, the algorithm shown in
"auto_evpn_fid2fabric_prefixes" (Figure 12) is required.
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A topology MUST elect at least 1 Top-of-Fabric node as an IBGP Route
Reflector, but SHOULD elect 3. The election method varies depending
upon whether the fabric is comprised of a single plane or multiple
planes or if DCI gateway functionality is desired.
4.6.2.1. Single Plane Route Reflector Election Procedures
Each ToF performs the election independently based on system IDs of
other ToFs in the fabric obtained via southbound reflection. The
Route Reflector election procedures are defined as follows:
1. ToF node with the highest System ID.
2. ToF node with the lowest System ID.
3. ToF node with the 2nd highest System ID.
4. etc.
This ordering is necessary to prevent a single node with either the
highest or lowest System ID from triggering changes to Route
Reflector loopback addresses as it would result in all BGP sessions
dropping.
For example, if two nodes, ToF01 and ToF02 with System IDs
002c6af5a281c000 and 002c6bf5788fc000 respectively, ToF02 would be
elected due to it having the highest System ID of the ToFs
(002c6bf5788fc000). If a ToF determines that it is elected as Route
Reflector, it uses the knowledge of its position in the list to
derive Route Reflector IPv6 loopback address.
The algorithm shown in "auto_evpn_sids2rrs" (Figure 10) is required
to accomplish this.
4.6.2.1.1. Data Center Interconnect Gateway Variations
It is beneficial for ToF-RRs requiring DCI-GW functions to be
preferred over ToF-RRs that do not. As such, the
"default_acting_auto_evpn_dci_when_tof" flag described in the
NodeFlags schema (Appendix B.1) MUST be factored into election
procedures mentioned in the previous section. Essentially, ToFs
flagged as requiring DCI-GW functions, will be sorted separately from
those that do not. That is to say, that ToFs requiring DCI-GW
functions will always be preferred as RRs.
For example, if a fabric contains 4 ToF nodes where 2 require DCI-GW
functions and the other 2 do not, the election will take place as
follows:
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1. ToF node (DCI) with the highest System ID.
2. ToF node (DCI) with the lowest System ID.
3. ToF node (non-DCI) with the 2nd highest System ID.
4. ToF node (non-DCI) with the 2nd lowest System ID.
4.6.2.2. Multiplane Route Reflector Election Procedures
As mentioned in the main RIFT [RIFT] specification, when an
implementation uses multiplane fabrics, inter-ToF rings are
recommended in order to facilitate northbound flooding between ToFs
in different planes.
If a multiplane implementation is using Auto-EVPN, those inter-Tof
rings are REQUIRED to ensure that DCI/RR election works as intended.
Each ToF performs the election independently based on system IDs of
other ToFs in the other fabrics obtained from northbound flooding
across the inter-ToF rings. The highest System ID from each plane
will be considered the Plane ID, which is then factored into the
election as follows:
1. The ToF node with the highest Plane ID, DCI bit, System ID
2. The ToF node with the lowest Plane ID, DCI bit, System ID
3. The ToF node with the 2nd highest Plane ID, DCI bit, System ID
4. etc.
This algorithm allows DCI/RRs to be split across planes for improved
redundancy.
4.7. Autonomous System Number
Nodes in each fabric MUST derive a private autonomous system number
based on its Fabric ID so that it is unique across the fabric.
The algorithm shown in auto_evpn_fid2private_AS (Figure 29) is
required to derive the private ASN.
4.8. Router ID
Nodes MUST drive a Router ID that is based on both its System ID and
Fabric ID so that it is unique to both.
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The algorithm shown in auto_evpn_sidfid2bgpid (Figure 15) is required
to derive the BGP Router ID.
4.9. Cluster ID
Route reflector nodes in each fabric MUST derive a Cluster ID that is
based on its Fabric ID so that it is unique across the fabric.
The algorithm shown in auto_evpn_fid2clusterid (Figure 30) is
required to derive the BGP Cluster ID.
4.10. Route Target
Nodes hosting EVPN EVIs MUST derive a route target extended community
based on the MAC-VRF ID for each EVI so that it is unique across the
network. Route targets MUST be of type 0 as per [RFC4360].
For example, if given a MAC-VRF ID of 1, the derived route target
would be "target:1"
The algorithm shown in auto_evpn_evi2rt (Figure 16) is required to
derive the Route Target community.
4.11. Route Distinguisher
Nodes hosting EVPN EVIs MUST derive a type-0 route distinguisher
based on its System ID and Fabric ID so that it is unique per node
within a fabric.
The algorithm shown in auto_evpn_sidfid2rd (Figure 22) is required to
derive the Route Distinguisher.
4.12. EVPN MAC-VRF Services
It's obvious that applications utilizing Auto-EVPN overlay services
may require a variety of layer-2 and/or layer-3 traffic
considerations. Variables supporting these services are also derived
based on some combination of MAC-VRF ID, Fabric ID, and other
constant values. Integrated Routing and Bridging (IRB) gateway
address derivation also leverages a set of constant RANDOMSEEDS
(Figure 9) values that MUST be used to provide additional entropy.
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In order to ensure that VLAN ID's don't collide, a single deployment
SHOULD NOT exceed 6 fabrics with 7 EVIs where each EVI terminates 30
VLANs. The algorithms shown in auto_evpn_fidevivlansvlans2desc
(Figure 20) and auto_evpn_vlan_description_table (Figure 19) are
required to derive VLANs accordingly. An implementation MAY exceed
this, but MUST indicate methods to ensure collision-free derivation
and describe which VLANs are stretched across fabrics.
Lastly, Table 3 shows example derivation results for the previously
mentioned scaling figures.
4.12.1. Untagged Traffic in Multiple Fabrics
This section defines methods to derive unique VLAN, VNI, MAC, and
gateway address values for deployments where untagged traffic is
stretched across multiple fabrics.
4.12.1.1. VLAN
Untagged traffic stretched across multiple fabrics MUST derive VLAN
tags based on MAC-VRF ID in conjunction with a constant value.
4.12.1.2. VNI
Untagged traffic stretched across multiple fabrics MUST derive VNIs
based on MAC-VRF ID in conjunction with a constant value. These VNIs
MUST correspond to EVPN Type-2 routes.
The algorithm shown in auto_evpn_fidevivid2vni (Figure 18) is
required to derive VNIs for Type-2 EVPN routes.
4.12.1.3. MAC Address
The MAC address MUST be a unicast address and also MUST be identical
for any IRB gateways that belong to an individual bridge-domain
across fabrics. The last 5-bytes MUST be a hash of the MAC-VRF ID
and a constant value that is calculated using the previously
mentioned random seed values.
The algorithm shown in auto_evpn_fidevividsid2mac (Figure 26) is
required to derive MAC addresses.
4.12.1.4. IPv6 IRB Gateway Address
The derived IPv6 gateway address MUST be from a ULA-scoped range that
will account for the first 6-bytes. The next 5-bytes MUST be the
last bytes of the derived MAC address. Finally, the remaining
7-bytes MUST be ::0001.
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The algorithm shown in auto_evpn_fidevividsid2v6subnet (Figure 25) is
required to derive the IPv6 gateway address.
4.12.1.5. IPv4 IRB Gateway Address
The derived IPv4 gateway address MUST be from a RFC1918 range, which
accounts for the first octet. The next octet MUST a hash of the MAC-
VRF ID and a constant value of 1 that is calculated using the
previously mentioned random seed values. Finally, the remaining 2
octets MUST be 0 and 1 respectively.
The algorithm shown in auto_evpn_v4prefixfidevividsid2v4subnet
(Figure 23) is required to derive the IPv4 gateway address. It
should be noted that there is a higher likelihood of address
collisions when deriving IPv4 addresses.
4.12.2. Tagged Traffic in Multiple Fabrics
This section defines methods to derive unique VLAN, VNI, MAC, and
gateway address values for deployments where tagged traffic is
stretched across multiple fabrics.
4.12.2.1. VLAN
Tagged traffic stretched across multiple fabrics MUST derive VLAN
tags based on MAC-VRF ID in conjunction with a constant value.
4.12.2.2. VNI
Tagged traffic stretched across multiple fabrics MUST derive VNIs
based on MAC-VRF ID in conjunction with a constant value. These VNIs
MUST correspond to EVPN Type-2 routes.
The algorithm shown in auto_evpn_fidevivid2vni (Figure 18) is
required to derive VNIs for Type-2 EVPN routes.
4.12.2.3. MAC Address
The MAC address MUST be a unicast address and also MUST be identical
for any IRB gateways that belong to an individual bridge-domain
across fabrics. The last 5-bytes MUST be a hash of the MAC-VRF ID
and a constant value that is calculated using the previously
mentioned random seed values.
The algorithm shown in auto_evpn_fidevividsid2mac (Figure 26) is
required to derive MAC addresses.
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4.12.2.4. IPv6 IRB Gateway Address
The derived IPv6 gateway address MUST be from a ULA-scoped range that
will account for the first 6-bytes. The next 5-bytes MUST be the
last bytes of the derived MAC address. Finally, the remaining
7-bytes MUST be ::0001.
The algorithm shown in auto_evpn_fidevividsid2v6subnet (Figure 25) is
required to derive the IPv6 gateway address.
4.12.2.5. IPv4 IRB Gateway Address
The derived IPv4 gateway address MUST be from a RFC1918 range, which
accounts for the first octet. The next octet MUST a hash of the MAC-
VRF ID and a constant value of 16 that is calculated using the
previously mentioned random seed values. Finally, the remaining 2
octets MUST be 0 and 1 respectively.
The algorithm shown in auto_evpn_v4prefixfidevividsid2v4subnet
(Figure 23) is required to derive the IPv4 gateway address. It
should be noted that there is a higher likelihood of address
collisions when deriving IPv4 addresses.
4.12.3. Tagged Traffic in a Single Fabric
This section defines a method to derive unique VLAN, VNI, MAC, and
gateway address values for deployments where untagged traffic is
contained within a single fabric.
4.12.3.1. VLAN
Tagged traffic contained to a single fabric MUST derive VLAN tags
based on MAC-VRF ID and Fabric ID in conjunction with a constant
value.
4.12.3.2. VNI
Tagged traffic contained to a single fabric MUST derive VNIs based on
MAC-VRF ID and Fabric ID in conjunction with a constant value. These
VNIs MUST correspond to EVPN Type-2 routes.
The algorithm shown in auto_evpn_fidevivid2vni (Figure 18) is
required to derive VNIs for Type-2 EVPN routes.
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4.12.3.3. MAC Address
The MAC address MUST be a unicast address and also MUST be identical
for any IRB gateways that belong to an individual bridge-domain
across fabrics. The last 5-bytes MUST be a hash of the MAC-VRF ID
and a constant value that is calculated using the previously
mentioned random seed values.
The algorithm shown in auto_evpn_fidevividsid2mac (Figure 26) is
required to derive MAC addresses.
4.12.3.4. IPv6 IRB Gateway Address
The derived IPv6 gateway address MUST be from a ULA-scoped range,
which accounts for the first 6-bytes. The next 5-bytes MUST be the
last bytes of the derived MAC address. Finally, the remaining
7-bytes MUST be ::0001.
The algorithm shown in auto_evpn_fidevividsid2v6subnet (Figure 25) is
required to derive the IPv6 gateway address.
4.12.3.5. IPv4 IRB Gateway Address
The derived IPv4 gateway address MUST be from a RFC1918 range, which
accounts for the first octet. The next octet MUST a hash of the MAC-
VRF ID and a constant value of 17 that is calculated using the
previously mentioned random seed values. Finally, the remaining 2
octets MUST be 0 and 1 respectively.
The algorithm shown in auto_evpn_v4prefixfidevividsid2v4subnet
(Figure 23) is required to derive the IPv4 gateway address. It
should be noted that there is a higher likelihood of address
collisions when deriving IPv4 addresses.
4.12.4. Traffic Routed to External Destinations
4.12.4.1. Route Distinguisher
Nodes hosting IP Prefix routes MUST derive a type-0 route
distinguisher based on its System ID and Fabric ID so that it is
unique per IP-VRF and per node.
The algorithm shown in auto_evpn_sidfid2rd (Figure 22) is required to
derive the Route Target.
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4.12.4.2. Route Target
Nodes hosting IP prefix routes MUST derive a route target extended
community based on the MAC-VRF ID for each IP-VRF so that it is
unique across the network. Route targets MUST be of type 0.
The algorithm shown in auto_evpn_evi2rt (Figure 16) is required to
derive the Route Target community.
5. RIFT Requirements
5.1. RIFT FSM / LIE Validation Requirements
Existing RIFT FSM adjacency rules MUST consider Auto-EVPN Version
(Section 4.2) and Auto-EVPN Fabric ID (Section 4.3) values so that
nodes that do not support Auto-EVPN can interoperate with those that
do. The LIE validation is extended with the following clause and if
it is not met, miscabling should be declared:
(if fabric_id is not advertised by either node OR
if fabric_id is identical on both nodes)
AND
(if auto_evpn_version is not advertised by either node OR
if auto_evpn_version is identical on both nodes)
5.2. RIFT Node-TIE Advertisements
All nodes utilizing Auto-EVPN MUST advertise their Auto-EVPN Version
(Section 4.2), Auto-EVPN Fabric ID (Section 4.3), and Auto-EVPN Model
(Section 4.4) values in at least one Node-TIE in each direction (i.e.
North and South).
6. Operational Considerations
To fully realize the benefits of Auto-EVPN, it may help to describe
the high-level methodology. Simply put, RIFT automatically
provisions the underlay and Auto-EVPN provisions the overlay. The
goal of this section is to draw clear lines between general fabric
concepts, RIFT, and Auto-EVPN and how they fit into current network
designs and practices.
This section also describes an set of optional Key-Value TIEs that
leverages the variables that have already been derived to provide
further operational enhancement to the operator.
6.1. RIFT Underlay and Auto-EVPN Overlay
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+----------------+ +----------------+
| Superspine-01 | | Superspine-02 |
| Top-of-Fabric | | Top-of-Fabric |
| RR/DCI Gateway | | RR/DCI Gateway |
+-+--+------+--+-+ +-+--+------+--+-+
| | | | | | | |
+---------------------+ | | | | | | |
| | | | | | | +---------------------+
| +-----------)------)--)--------+ | | |
| | | | | +-------+ | |
| | | | | | | |
| | | | +---)--------------)-----------+ |
| | | | | | | |
| | +--+ +------)----+ +--+ | |
| | | | | | | |
| | | +---+ | | | |
| | | | | | | |
+-+------------+-+ +-+------------+-+ +-+------------+-+ +-+------------+-+
| Spine-1-1 | | Spine-1-2 | | Spine-2-1 | | Spine-2-2 |
| Top-of-PoD | | Top-of-PoD | | Top-of-PoD | | Top-of-PoD |
| N/A | | N/A | | N/A | | N/A |
+--+----------+--+ +--+----------+--+ +--+----------+--+ +--+----------+--+
| | | | | | | |
| +----------)---+ | | +----------)---+ |
| | | | | | | |
| +----------+ | | | +----------+ | |
| | | | | | | |
+--+----------+--+ +------+------+--+ +--+----------+--+ +------+------+--+
| Leaf-1-1 | | Leaf-1-2 | | Leaf-2-1 | | Leaf-2-2 |
| Leaf +----+ Leaf | | Leaf | | Leaf |
| Leaf Gateway | | Leaf Gateway | | Leaf Gateway | | Leaf Gateway |
+--+-------------+ +--------------+-+ +--+-------------+ +----------------+
| | |
| ESI | |
| (00:00:00:00:00:00:00:00:11:01) | |
| +----------------------+ |
| | |
+--+----------+--+ +--+-------------+
| Server-1-1 | | Server-2-2 |
+----------------+ +----------------+
+-------------- PoD-1 -------------+ +-------------- PoD-2 -------------+
Figure 1: Auto-EVPN Example Topology
Figure 1 illustrates a typical 5-stage Clos IP fabric. Each node is
labelled in such a way that conveys the following:
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1. The nodes placement within the generic IP fabric.
2. The nodes role within the RIFT IP underlay.
3. The nodes role within the Auto-EVPN overlay.
Table 1 should also help further align these concepts.
+==================+===============+====================+
| Fabric Placement | RIFT Role | Auto-EVPN Role |
+==================+===============+====================+
| Superspine | Top-of-Fabric | Route Reflector |
| | | and/or DCI Gateway |
+------------------+---------------+--------------------+
| Spine | Spine or Top- | N/A |
| | of-PoD | |
+------------------+---------------+--------------------+
| Leaf | Leaf | Leaf Gateway |
+------------------+---------------+--------------------+
Table 1: Role Associations
It's also important to remember that Auto-EVPN simply takes existing
EVPN overlay deployment scenarios and simplifies the provisioning.
Figure 2 further illustrates the resulting EVPN overlay topology.
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+----------------+ +----------------+
| Superspine-01 | | Superspine-02 |
| RR1 | | RR2 |
| | | |
+-+--+---------+-+ +-+--+---------+-+
| | | | | |
+---------------------+ | | | | |
| | | | | |
| +-----------)---------)--------+ | |
| | | | +-------+ |
| | | | | |
| | | +---)-----+ |
| | | | | |
| | +--+ | | |
| | | | | |
| | | +---+ | |
| | | | | |
+--+----------+--+ +------+------+--+ +--+-----------+-+
| Leaf-1-1 | | Leaf-1-2 | | Leaf-2-1 |
| Leaf Gateway | | Leaf Gateway | | Leaf Gateway |
| | | | | |
+--+-------------+ +--------------+-+ +--+-------------+
| | |
| ESI | |
| (00:00:00:00:00:00:00:00:11:01) | |
| +----------------------+ |
| | |
+--+----------+--+ +--+-------------+
| Server-1-1 | | Server-2-2 |
+----------------+ +----------------+
+-------------- PoD-1 -------------+ +-------------- PoD-2 -------------+
Figure 2: Auto-EVPN Overlay Topology
6.2. Auto-EVPN Analytics
Leaf nodes MAY optionally advertise analytics information about the
Auto-EVPN fabric to ToF nodes using RIFT Key-Value TIEs. This may be
advantageous in that overlay validation and troubleshooting
activities can be performed on the ToF nodes.
6.2.1. Auto-EVPN Analytics (Global) Key/Value Pair
This Key/Value pair describes node level information within the
context of the Auto-EVPN fabric. The System ID of the advertising
leaf node MUST be used to differentiate the node among other nodes in
the fabric.
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The Auto-EVPN Analytics (Global) Key/Value pair MUST be advertised
with the Auto-EVPN Fabric ID encoded into the 3rd and 4th bytes of
the Key Identifier.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Well-Known | Auto-EVPN (Global) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| (Auto-EVPN Role, |
| Established BGP Peer Count, |
| Total BGP Peer Count,) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 3: Auto-EVPN Analytics (Global) Key/Value Pair
*where:*
*Auto-EVPN Role:*
A REQUIRED value indicating the node's Auto-EVPN role within
the fabric.
*0:* Illegal value, MUST NOT be used.
*1:* Auto-EVPN Leaf Gateway
*2:* Auto-EVPN Top-of-Fabric Gateway
*Established BGP Session Count:*
A RECOMMENDED 16-bit integer indicating the number of BGP
sessions in the Established state.
*Total BGP Peer Count:*
A RECOMMENDED 16-bit integer indicating the total number of
possible BGP sessions on the local node, regardless of state.
Implementations leveraging Thrift for Key-Value functionality SHOULD
refer to the auto_evpn_kv.thrift (Appendix B.4) schema in the
appendix.
6.2.2. Auto-EVPN Analytics (MAC-VRF) Key/Value Pair
This Key/Value pair contains information about a specific MAC-VRF on
a node within the Auto-EVPN fabric.
The Auto-EVPN MAC-VRF Key/Value pair MUST be advertised with the
Auto-EVPN MAC-VRF ID encoded into the 3rd and 4th bytes of the Key
Identifier.
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All values advertised in this Key/Value pair MUST represent only
state of the local node.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Well-Known | Auto-EVPN (MAC-VRF) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| (Operational CE Interface Count, |
| Total CE Interface Count, |
| Operational IRB Interface Count, |
| Total IRB Interface Count, |
| EVPN Type-2 MAC Route Count, |
| EVPN Type-2 MAC/IP Route Count, |
| Configured VLAN Count, |
| MAC-VRF Name, |
| MAC-VRF Description,) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 4: Auto-EVPN Analytics (MAC-VRF) Key/Value Pair
*where:*
*Operational Customer Edge Interface Count:*
A RECOMMENDED 16-bit integer indicating the number of CE
interfaces associated with the MAC-VRF where both
administrative and operational status are "up".
*Total Customer Edge Interface Count:*
A RECOMMENDED 16-bit integer indicating the total number of CE
interfaces associated with the MAC-VRF regardless of interface
status.
*Operational IRB Interface Count:*
A RECOMMENDED 16-bit integer indicating the number of IRB
interfaces associated with the MAC-VRF where both
administrative and operational status are "up".
*Total IRB Interface Count:*
A RECOMMENDED 16-bit integer indicating the total number of IRB
interfaces associated with the MAC-VRF regardless of interface
status.
*EVPN Type-2 MAC Route Count:*
A RECOMMENDED 32-bit integer indicating the total number of
EVPN Type-2 MAC routes.
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*EVPN Type-2 MAC/IP Route Count:*
A RECOMMENDED 32-bit integer indicating the total number of
EVPN Type-2 MAC/IP routes.
*VLAN Count:*
A RECOMMENDED 16-bit integer indicating the total number
configured VLANs.
*MAC-VRF Name:*
A RECOMMENDED string used to indicate the name of the MAC-VRF
on the node.
*MAC-VRF Description:*
A RECOMMENDED string used to describe the MAC-VRF on the node,
similar to that of an interface description.
Implementations leveraging Thrift for Key-Value functionality SHOULD
refer to the auto_evpn_kv.thrift (Appendix B.4) schema in the
appendix.
7. IANA Considerations
This section requests the suggested values from the RIFT Well-Known
Key-Type Registry and describes their use for Auto-EVPN.
+=======+================+=======================+===========+
| Value | Key-Identifier | Description | Status/ |
| | | | Reference |
+=======+================+=======================+===========+
| 3 | Auto-EVPN | Analytics describing | This |
| | Analytics | the state of a MAC- | document. |
| | (MAC-VRF) | VRF on a particular | |
| | | node within a fabric. | |
+-------+----------------+-----------------------+-----------+
| 4 | Auto-EVPN | Analytics describing | This |
| | Analytics | BGP state for an | document. |
| | (Global) | Auto-EVPN node within | |
| | | a fabric. | |
+-------+----------------+-----------------------+-----------+
Table 2: Auto-EVPN Suggested Value(s) for RIFT Well-Known
Key-Type Registry
8. Security Considerations
This document introduces no new security concerns to RIFT or other
specifications referenced in this document.
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9. Acknowledgements
The authors would like to thank Olivier Vandezande for some nice
operational improvements for variable derivation procedures, as well
as Matthew Jones and Michal Styszynski for their contributions.
10. References
10.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<https://www.rfc-editor.org/info/rfc2119>.
[RFC4360] Sangli, S., Tappan, D., and Y. Rekhter, "BGP Extended
Communities Attribute", February 2006,
<https://www.rfc-editor.org/info/rfc4360>.
[RFC7432] Sajassi, A., Aggarwal, R., Bitar, N., Isaac, A., Uttaro,
J., Drake, J., and W. Henderickx, "BGP MPLS-Based Ethernet
VPN", February 2015,
<https://www.rfc-editor.org/info/rfc7432>.
[RFC8126] Cotton, M., Leiba, B., and T. Narten, "Guidelines for
Writing an IANA Considerations Section in RFCs", June
2017, <https://www.rfc-editor.org/info/rfc8126>.
[RIFT] Przygienda, T., Sharma, A., Thubert, P., Rijsman, B.,
Afanasiev, D., and J. Head, "RIFT: Routing in Fat Trees",
Work in Progress draft-ietf-rift-rift-18, July 2023,
<https://www.ietf.org/archive/id/draft-ietf-rift-rift-
18.html>.
[RIFT-KV] Head, J. and T. Przygienda, "RIFT Key/Value Structure and
Registry", Work in Progress, draft-head-rift-kv-registry-
05, March 2023.
Appendix A. YANG Model
This section serves as a placeholder for a YANG model supporting RIFT
Auto-EVPN.
Appendix B. Thrift Models
This section contains the normative Thrift models required to support
Auto-EVPN. Per the main RIFT [RIFT] specification, all signed values
MUST be interpreted as unsigned values.
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B.1. common.thrift
This section specifies extensions to RIFT common.thrift model.
These extensions are REQUIRED in order to support Auto-EVPN.
...
/** EVPN Fabric ID */
typedef i16 FabricIDType
const FabricIDType undefined_fabric_id = 0
const FabricIDType default_fabric_id = 1
const bool default_acting_auto_evpn_dci_when_tof = false
enum AutoEVPNModel {
ERB_VLAN_BUNDLE = 0,
}
const AutoEVPNModel default_autoevpn_model = AutoEVPNModel.ERB_VLAN_BUNDLE
Figure 5: RIFT Common Schema for Auto-EVPN
B.2. encoding.thrift
This section specifies extensions to RIFT encoding.thrift model.
These extensions are REQUIRED in order to support Auto-EVPN.
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struct LIEPacket {
...
/** provides the optional ID of the configured auto-evpn fabric. */
35: optional common.FabricIDType fabric_id;
/** provides optional version of EVPN ZTP as 256 * MAJOR + MINOR */
36: optional i16 auto_evpn_version;
...
}
struct NodeTIEElement {
...
/** All Auto EVPN elements MUST be present in at least one node TIE in each direction if auto evpn is running. */
/** It provides optional version of EVPN ZTP as 256 * MAJOR + MINOR, if set auto EVPN is enabled. */
21: optional i16 auto_evpn_version;
/** It provides the optional ID of the Fabric configured */
22: optional common.FabricIDType fabric_id = common.default_fabric_id;
/** provides optionally the EVPN model supported */
25: optional common.AutoEVPNModel auto_evpn_model = common.AutoEVPNModel.ERB_VLAN_BUNDLE,
...
}
struct NodeCapabilities {
...
/** provides the optional ID of the configured auto-evpn fabric. */
10: optional bool auto_evpn_support = false;
...
}
struct NodeFlags {
...
/** acting as DCI for auto-evpn, necessary for proper RR election where DCIs are preferred */
10: optional bool acting_auto_evpn_dci_when_tof = common.default_acting_auto_evpn_dci_when_tof,
...
}
Figure 6: RIFT Encoding Schema for Auto-EVPN
B.3. common_evpn.thrift
This section defines common_evpn.thrift, a normative Thrift model to
support the core functionality for Auto-EVPN.
This model is REQUIRED in order to support Auto-EVPN.
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/**
Thrift file for common AUTO EVPN definitions for RIFT
Copyright (c) Juniper Networks, Inc., 2016-
All rights reserved.
*/
namespace py common_evpn
namespace rs models
include "common.thrift"
include "encoding.thrift"
include "statistics.thrift"
const i8 default_evis = 3
const i8 default_vlans_per_evi = 7
typedef i32 RouterIDType
typedef i32 ASType
typedef i32 ClusterIDType
struct EVPNAnyRole {
1: required common.IPv6Address v6_loopback,
2: required common.IPv6Address type5_v6_loopback,
3: required common.IPv4Address type5_v4_loopback,
4: required RouterIDType bgp_router_id,
5: required ASType autonomous_system,
6: required ClusterIDType cluster_id,
/** prefixes to be redistributed north */
7: required set<common.IPPrefixType> redistribute_north,
/** prefixes to be redistributed south */
8: required set<common.IPPrefixType> redistribute_south,
/** group name for evpn auto overlay */
9: required string bgp_group_name,
/** fabric prefixes to be advertised in rift instead of default */
10: required set<common.IPPrefixType> fabric_prefixes,
/** v6 loopback prefix range, used e.g. to clean up config */
20: required common.IPv6PrefixType v6_loopback_range,
21: required common.IPv6PrefixType rr_loopback_range,
22: required common.IPv6PrefixType type5_loopback_range,
23: required common.IPv4PrefixType type5_v4_loopback_range,
/** v6 addresses of all possible RR loopbacks in this config. Can be used for e.g. cleanup */
24: required set<common.IPv6PrefixType> possible_elected_rrs,
}
struct PartialEVPNEVI {
// route target per RFC4360
1: required CommunityType rt_target,
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2: required RTDistinguisherType rt_distinguisher,
3: required RTDistinguisherType rt_type5_distinguisher,
5: required string mac_vrf_name,
6: required VNIType type5_vni,
}
struct EVPNRRRole {
2: required common.IPv6Address v6_rr_addr_loopback,
3: required common.IPv6PrefixType v6_peers_allowed_range,
4: required map<MACVRFNumberType, PartialEVPNEVI> evis,
}
typedef i64 RTDistinguisherType
typedef i64 RTTargetType
typedef i16 MACVRFNumberType
typedef i16 VLANIDType
typedef binary MACType
typedef i16 UnitType
struct IRBType {
1: required string name,
2: required UnitType unit,
/// constant
3: required MACType mac,
/// contains address of the gateway as well
4: optional common.IPv6PrefixType v6_subnet,
/// contains address of the gateway as well
5: optional common.IPv4PrefixType v4_prefix,
}
typedef i32 VNIType
struct VLANType {
1: optional VLANIDType id,
2: required string name,
3: optional IRBType irb,
5: optional bool stretched = false,
6: optional bool is_native = false,
}
struct CEInterfaceType {
2: optional common.IEEE802_1ASTimeStampType moved_to_ce,
// we may not be able to obtain it in case of internal errors
3: optional string platform_interface_name,
}
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typedef i64 CommunityType
struct EVPNEVI {
// route target per RFC4360
1: required CommunityType rt_target,
2: required RTDistinguisherType rt_distinguisher,
3: required RTDistinguisherType rt_type5_distinguisher,
4: required string mac_vrf_name,
// fabric unique 24 bits VNI on non-stretch, otherwise unique across fabrics
5: required map<VNIType, VLANType> vlans,
6: required VNIType type5_vni,
}
struct EVPNLeafRole {
1: required set<common.IPv6Address> rrs,
2: required map<MACVRFNumberType, EVPNEVI> evis,
3: optional map<common.LinkIDType,
CEInterfaceType> ce_interfaces,
5: optional binary leaf_unique_lacp_system_id,
6: optional binary fabric_unique_lacp_system_id,
}
/// structure to indicate EVPN roles assumed and their variables for
/// external platform to configure itself accordingly. Presence of
/// according structure indicates that the role is assumed.
struct EVPNRoles {
1: required EVPNAnyRole generic,
2: optional EVPNRRRole route_reflector,
3: optional EVPNLeafRole leaf,
}
const common.TimeIntervalInSecType default_leaf_delay = 120
const common.TimeIntervalInSecType default_interface_ce_delay = 180
/// default delay before AUTOEVPN FSM starts to compute anything
const common.TimeIntervalInSecType default_AUTOEVPN_startup_delay = 60
Figure 7: Auto-EVPN Common Thrift Schema
B.4. auto_evpn_kv.thrift
This section defines auto_evpn_kv.thrift as a method of supporting
Auto-EVPN analytics functionality.
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include "common.thrift"
namespace py auto_evpn_kv
namespace rs models
/** We don't need the full role structure, only an indication of the node's basic role */
enum AutoEVPNRole {
ILLEGAL = 0,
auto_evpn_leaf_erb = 1,
auto_evpn_tof_gw = 2,
}
const i8 AutoEVPNWellKnownKeyType = 1
typedef i32 AutoEVPNKeyIdentifier
typedef i16 AutoEVPNCounterType
typedef i32 AutoEVPNLongCounterType
const i8 GlobalAutoEVPNTelemetryKV = 4
const i8 AutoEVPNTelemetryKV = 3
/** Per the according RIFT draft the key comes from the well known space.
Part of the key is used as Fabric-ID.
1st byte MUST be = "Well-Known"
2nd byte MUST be = "Auto-EVPN Analytics (Global)",
3rd/4th bytes MUST be = FabricIDType
*/
struct AutoEVPNTelemetryGlobalKV {
/** Only values that the ToF cannot derive itself should be flooded. */
1: required set<AutoEVPNRole> auto_evpn_roles,
/** Established BGP peer count (for Auto-EVPN)
2: optional AutoEVPNCounterType established_bgp_peer_count,
/** Total BGP peer count (for Auto-EVPN)
3: optional AutoEVPNCounterType total_bgp_peer_count,
}
/** Per the according RIFT draft the key comes from the well known space.
Part of the key is used as MAC-VRF number.
1st byte MUST be = "Well-Known"
2nd byte MUST be = "Auto-EVPN Analytics (MAC-VRF)",
3rd/4th bytes MUST be = MACVRFNumberType
*/
struct AutoEVPNTelemetryMACVRFKV {
/** Active CE interface count (up/up)
1: optional AutoEVPNCounterType active_ce_interfaces,
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/** Total CE interface count
2: optional AutoEVPNCounterType total_ce_interfaces,
/** Active IRB interface count (up/up)
3: optional AutoEVPNCounterType active_irb_interfaces,
/** Total IRB interface count
4: optional AutoEVPNCounterType total_irb_interfaces,
/** Local EVPN Type-2 MAC route count
5: optional AutoEVPNLongCounterType local_evpn_type2_mac_routes,
/** Local EVPN Type-2 MAC/IP route count
6: optional AutoEVPNLongCounterType local_evpn_type2_mac_ip_routes,
/** number of configured VLANs */
7: optional i16 configured_vlans,
/** optional human readable name */
8: optional string name,
/** optional human readable string describing the MAC-VRF */
9: optional string description,
}
Figure 8: Auto-EVPN Key-Value Thrift Schema
Appendix C. Auto-EVPN Variable Derivation
C.1. Variable Derivation Functions
This section contains the normative derivation procedures that are
REQUIRED to support Auto-EVPN.
/// indicates how many RRs we're computing in AUTO EVPN
pub const MAX_AUTO_EVPN_RRS: usize = 3;
/// indicates the fabric has no ID, used in computations to omit effects of fabric ID
pub const NO_FABRIC_ID: FabricIDType = 0;
/// invalid MACVRF number, MACVRFs start from 1
pub const NO_MACVRF: MACVRFNumberType = 0;
/// first MACVRF
pub const MIN_MACVRF : MACVRFNumberType = 1;
/// unique v6 prefix for all nodes starts with this
pub fn auto_evpn_v6pref(fid: FabricIDType) -> String {
format!("FD00:{:04X}:A1", fid)
}
/// how many bytes in a v6pref for different purposes
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pub const AUTO_EVPN_V6PREFLEN: usize = 8 * 5;
/// unique v6 prefix for route reflector purposes starts like this
pub fn auto_evpn_v6rrpref(fid: FabricIDType) -> String {
format!("FD00:{:04X}:A2", fid)
}
/// unique v6 prefix for type-5 purposes starts like this
pub fn auto_evpn_v6t5pref(fid: FabricIDType) -> String {
format!("FD00:{:04X}:A3", fid)
}
/// unique v6 prefix for IRB prefix purposes
pub fn auto_evpn_v6irbpref(fid: FabricIDType) -> String {
format!("FD00:{:04X}:A4", fid)
}
/// 2 bytes of prefix, then fabric ID, then another byte
pub const AUTO_EVPN_V6_FABPREFIXLEN: usize = 16 + 16 + 8;
/// unique v4 prefix for IRB purposes
pub const AUTO_EVPN_V4IRBPREF: &str = "10";
/// per RFC magic
const RT_TARGET_HIGH: CommunityType = 0;
const RT_TARGET_LOW: CommunityType = 0;
/// first available VLAN number
pub const FIRST_VLAN: UnsignedVLANIDType = 1;
// maximum vlan number one less than maximum to use as bitmask
pub const MAX_VLAN: UnsignedVLANIDType = 4095;
/// constant VLAN shift
pub const FIRST_VLAN_SHIFT: UnsignedVLANIDType = NATIVE_VLAN + 1;
/// NATIVE VLAN number
pub const NATIVE_VLAN: UnsignedVLANIDType = 1;
/// abstract description of VLAN properties for a derived VLAN
pub struct VLANDescription {
pub vlan_id: UnsignedVLANIDType,
pub name: String,
/// can this VLAN be stretched across multiple fabrics
pub stretchable: bool,
pub native: bool,
}
/// maximum number of VLANs per MACVRF
pub const MAX_VLANS_PER_EVI: usize = 30;
/// maximum number of EVIs
pub const MAX_EVIS: MACVRFNumberType = 7;
pub type VLANStretchableType = bool;
pub type VLANNativeType = bool;
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pub type UnsignedVNIType = u32;
pub type UnsignedFabricIDType = u16;
pub type UnsignedUnitType = u16;
pub type UnsignedVLANIDType = u16;
pub type UnsignedRTDistinguisherType = u64;
pub const EXTRATYPE5_RD_DISTINGUISHER: u32 = 0xffff_ffff;
/// high bits of type 5 VNI
const TYPE5VNIHIGH: UnsignedVNIType = 0x0080_0000;
/// bitmask for type 2 VNI
const TYPE2VNIMASK: UnsignedVNIType = 0x00ff_ffff ^ TYPE5VNIHIGH;
/// random seeds used in several algorithms to increase entropy
pub const RANDOMSEEDS: [u64; 4] = [
27008318799u64,
67438371571,
37087353685,
88675895388,
];
Figure 9: auto_evpn_const_structs_type
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/// function sorts vector of (is_dci, systemID) first,
/// splits of the DCIs from the non-DCIs and sorts them
/// followed by a shuffle taking largest/smallest/2nd largest/2nd smallest.
/// Ultimately both are merged which prefers the DCIs while
/// still making sure that the election is stable with a system ID joining
/// as smallest/largest.
pub(crate) fn auto_evpn_sids2rrs(v: Vec<(bool, UnsignedSystemID)>)
-> Vec<UnsignedSystemID> {
let (dcis, nondcis): (Vec<(bool, UnsignedSystemID)>, Vec<(bool, UnsignedSystemID)>) =
v.into_iter().partition(|(dci, _)| *dci);
vec![dcis, nondcis]
.into_iter()
.flat_map(|mut v| {
v.par_sort();
if v.len() > 2 {
let mut s = v.split_off(v.len() / 2);
s.reverse();
interleave(v.into_iter(), s.into_iter())
.collect::<Vec<_>>()
.into_iter()
} else {
v.into_iter()
}
})
.map(|(_, sid)| sid)
.collect()
}
Figure 10: auto_evpn_sids2rrs
pub(crate) fn auto_evpn_v62octets(a: Ipv6Addr) -> Vec<u8> {
a.octets().iter().cloned().collect()
}
Figure 11: auto_evpn_v62octets
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/// fabric prefixes derived instead of advertising default on the fabric to allow
/// for default route on ToF or leaves
pub fn auto_evpn_fid2fabric_prefixes(fid: FabricIDType) -> Result<Vec<IPPrefixType>, ServiceErrorType> {
vec![
(auto_evpn_fidsidv6loopback(fid, ILLEGAL_SYSTEM_I_D as _), AUTO_EVPN_V6PREFLEN),
(auto_evpn_fidrrpref2rrloopback(fid, ILLEGAL_SYSTEM_I_D as _), AUTO_EVPN_V6PREFLEN),
]
.into_iter()
.map(|(p, _)|
match p {
Ok(_) => Ok(
IPPrefixType::Ipv6prefix(
IPv6PrefixType {
address: auto_evpn_v62octets(p?),
prefixlen: AUTO_EVPN_V6PREFLEN as _,
})),
Err(e) => Err(e),
}
)
.collect::<Result<Vec<_>, _>>()
}
Figure 12: auto_evpn_fid2fabric_prefixes
/// local address with encoded fabric ID and system ID for collision free identifiers. Basis
/// for several different prefixes.
pub fn auto_evpn_v6prefixfidsid2loopback(v6pref: &str, fid: FabricIDType,
sid: UnsignedSystemID) -> Result<Ipv6Addr, ServiceErrorType> {
assert!(fid != UNDEFINED_FABRIC_ID);
let a = format!("{}00::{}",
v6pref,
sid.to_ne_bytes()
.iter()
.chunks(2)
.into_iter()
.map(|chunk|
chunk.fold(0u16, |v, n| (v << 8) | *n as u16))
.map(|v| format!("{:04X}", v))
.collect::<Vec<_>>()
.into_iter()
.join(":")
);
Ipv6Addr::from_str(&a)
.map_err(|_| ServiceErrorType::INTERNALRIFTERROR)
}
Figure 13: auto_evpn_v6prefixfidsid2loopback
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/// auto evpn V6 loopback for RRs
pub fn auto_evpn_fidrrpref2rrloopback(fid: FabricIDType,
preference: u8) -> Result<Ipv6Addr, ServiceErrorType> {
auto_evpn_v6prefixfidsid2loopback(&auto_evpn_v6rrpref(fid), fid, (1 + preference) as _)
}
Figure 14: auto_evpn_fidrrpref2rrloopback
/// auto evpn BGP router ID
pub fn auto_evpn_sidfid2bgpid(fid: FabricIDType, sid: UnsignedSystemID) -> u32 {
assert!(fid != 0);
let hs: u32 = ((sid & 0xffff_ffff_0000_0000) >> 32) as _;
let mut ls: u32 = (sid & 0xffff_ffff) as _;
ls = ls.rotate_right(7) ^ (fid as u32).rotate_right(13);
max(1, hs ^ ls) // never a 0
}
Figure 15: auto_evpn_sidfid2bgpid
/// route target bytes are type0/0 and then add EVI
pub fn auto_evpn_evi2rt(evi: MACVRFNumberType) -> CommunityType {
let wideevi = (evi + 1) as CommunityType;
(RT_TARGET_HIGH << (64 - 8)) | (RT_TARGET_LOW << 64 - 16) |
((wideevi) << 17) |
((wideevi))
}
Figure 16: auto_evpn_evi2rt
/// type-5 VNI for an EVI
pub fn auto_evpn_fidevi2type5vni(fid: FabricIDType, evi: MACVRFNumberType) -> UnsignedVNIType {
TYPE5VNIHIGH | auto_evpn_fidevivid2vni(fid, evi, 0, false)
}
Figure 17: auto_evpn_fidevi2type5vni
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/// type-2 VNI for a specific VLAN
pub fn auto_evpn_fidevivid2vni(fid: FabricIDType, evi: MACVRFNumberType, vlanid: VLANIDType, stretchable: bool) -> UnsignedVNIType {
let rfid = if stretchable {
NO_FABRIC_ID as _
} else {
fid as UnsignedVNIType
};
let revi = evi as UnsignedVNIType;
let rvlan = vlanid as UnsignedVNIType;
// mask out high bits, VNI is only 24 bits
TYPE2VNIMASK &
(
rfid.rotate_left(16) ^
revi.rotate_left(12) ^
rvlan
)
}
Figure 18: auto_evpn_fidevivid2vni
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/// maximum VLANs per EVI supported by auto evpn when deriving
pub fn auto_evpn_vlan_description_table<'a>(vlans: usize)
-> Result<&'a [(UnsignedVLANIDType, VLANStretchableType, VLANNativeType)], ServiceErrorType> {
// up to 15 vlans can be activated
const VLANSARRAY: [(UnsignedVLANIDType, bool, bool); MAX_VLANS_PER_EVI] = [
(NATIVE_VLAN, true, true, ),
(FIRST_VLAN_SHIFT, true, false, ),
(FIRST_VLAN_SHIFT + 1, true, false, ),
(FIRST_VLAN_SHIFT + 2, true, false, ),
(FIRST_VLAN_SHIFT + 3, true, false, ),
(FIRST_VLAN_SHIFT + 4, true, false, ),
(FIRST_VLAN_SHIFT + 5, true, false, ),
(FIRST_VLAN_SHIFT + 6, true, false, ),
(FIRST_VLAN_SHIFT + 7, true, false, ),
(FIRST_VLAN_SHIFT + 8, false, false, ),
(FIRST_VLAN_SHIFT + 9, false, false, ),
(FIRST_VLAN_SHIFT +10, false, false, ),
(FIRST_VLAN_SHIFT +11, false, false, ),
(FIRST_VLAN_SHIFT +12, false, false, ),
(FIRST_VLAN_SHIFT +13, false, false, ),
(FIRST_VLAN_SHIFT +14, false, false, ),
(FIRST_VLAN_SHIFT +15, false, false, ),
(FIRST_VLAN_SHIFT +16, false, false, ),
(FIRST_VLAN_SHIFT +17, false, false, ),
(FIRST_VLAN_SHIFT +18, false, false, ),
(FIRST_VLAN_SHIFT +19, false, false, ),
(FIRST_VLAN_SHIFT +20, false, false, ),
(FIRST_VLAN_SHIFT +21, false, false, ),
(FIRST_VLAN_SHIFT +22, false, false, ),
(FIRST_VLAN_SHIFT +23, false, false, ),
(FIRST_VLAN_SHIFT +24, false, false, ),
(FIRST_VLAN_SHIFT +25, false, false, ),
(FIRST_VLAN_SHIFT +26, false, false, ),
(FIRST_VLAN_SHIFT +27, false, false, ),
(FIRST_VLAN_SHIFT +28, false, false, ),
];
if vlans > VLANSARRAY.len() {
return Err(ServiceErrorType::INVALIDPARAMETERVALUE)
}
Ok(&VLANSARRAY[..vlans])
}
Figure 19: auto_evpn_vlan_description_table
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const fn num_bits<T>() -> usize { std::mem::size_of::<T>() * 8 }
fn log2(x: u32) -> u32 {
assert!(x > 0);
num_bits::<u32>() as u32 - x.leading_zeros() - 1
}
/// delivers the vlan description that can be used to generate vlans for a
/// specific fabric ID and a MACVRF number
pub fn auto_evpn_fidevivlansvlans2desc(fid: UnsignedFabricIDType, macvrf: MACVRFNumberType,
vlans: usize) -> Vec<VLANDescription> {
assert!(NO_MACVRF != macvrf);
// abstract description of derived VLANs
let vlan_table = auto_evpn_vlan_description_table(vlans)
.expect("vlan table in AUTO EVPN incorrect");
let vlanshift = log2(vlan_table
.iter()
.map(|(vl, _, _)| *vl as usize)
.max()
.expect("vlan table in AUTO EVPN incorrect")
.checked_next_power_of_two()
.expect("vlan table in AUTO EVPN incorrect")
as u32);
vlan_table
.iter()
.map(move |(vid, stretch, native_)| {
let stretchedfid = if !stretch {
fid
} else {
NO_FABRIC_ID as _
};
let reducedmacvrf = macvrf - MIN_MACVRF;
// we shift fid & evi same amount to extinguish them possibly
let fidandevishift = vlanshift + 1;
let mut vlan_id = *vid ^ stretchedfid
.rotate_left(fidandevishift) as UnsignedVLANIDType;
// leave space for VLANs in the encoding
vlan_id ^= reducedmacvrf.rotate_left(fidandevishift) as UnsignedVLANIDType;
vlan_id %= MAX_VLAN;
vlan_id = max(1, vlan_id);
VLANDescription {
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vlan_id: vlan_id as _,
name: format!("V{}", vlan_id),
stretchable: *stretch,
native: *native_,
}
})
.collect()
}
Figure 20: auto_evpn_fidevivlansvlans2desc
/// IRB interface number.
/// fid/evi combination shifted up to not interfere with the VLAN-ID
/// and then add the VLAN-ID
pub fn auto_evpn_fidevivid2irb(_fid: FabricIDType, _evi: MACVRFNumberType, vid: VLANIDType) -> UnsignedUnitType {
assert!(NO_MACVRF != _evi);
// VLAN collision function is collision free to the point we can just ignore EVI
// and assign IRB interface number to be same as VLAN which simplifies deployment
let mut v: UnsignedUnitType = 0;
v = v.wrapping_add(vid as UnsignedVLANIDType);
max(1, v % (UnsignedUnitType::MAX - 1))
}
Figure 21: auto_evpn_fidevivid2irb
/// route distinguisher derivation
pub fn auto_evpn_sidfid2rd(sid: UnsignedSystemID, fid: UnsignedFabricIDType, extra: u32) -> UnsignedRTDistinguisherType {
// generate type 0 route distinguisher, first 2 bytes 0 and then 6 bytes
assert!(fid != NO_FABRIC_ID as _);
// shift the 2 bytes we loose
let convsid = sid as UnsignedRTDistinguisherType;
let hs = ((sid & 0xffff_0000_0000_0000) >> 32) as UnsignedRTDistinguisherType;
let mut ls: UnsignedRTDistinguisherType = convsid & 0x0000_ffff_ffff_ffff;
ls ^= hs;
ls ^= (fid as UnsignedRTDistinguisherType).rotate_left(16);
ls ^= extra as UnsignedRTDistinguisherType;
ls
}
Figure 22: auto_evpn_sidfid2rd
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/// v4 subnet derivation
pub fn auto_evpn_v4prefixfidevividsid2v4subnet(v4pref: &str, fid: FabricIDType,
evi: MACVRFNumberType, vid: VLANIDType,
sid: UnsignedSystemID) -> Result<IPv4PrefixType, ServiceErrorType> {
assert!(NO_MACVRF != evi);
// fid can be 0 for stretched v4subnets
let mut sub = evi.to_ne_bytes().iter()
.fold((RANDOMSEEDS[0] & 0xff) as u8, |r, e| r.rotate_left(1) ^ e.rotate_right(1));
sub ^= fid.to_ne_bytes().iter()
.fold((RANDOMSEEDS[1] & 0xff) as u8, |r, e| r.rotate_left(2) ^ e.rotate_right(1));
sub ^= vid.to_ne_bytes().iter()
.fold((RANDOMSEEDS[2] & 0xff) as u8, |r, e| r.rotate_left(3) ^ e.rotate_right(1));
let subnet = sub % 254; // make sure we don't show multicast subnet
let _host = sid.to_ne_bytes().iter()
.fold(0u16, |r, e| r.rotate_left(3) ^ e.rotate_right(3) as u16);
let a = format!("{}.{}.{}.{}",
v4pref,
subnet,
0,
1,
);
Ok(
IPv4PrefixType {
address: Ipv4Addr::from_str(&a)
.map_err(|_| {
ServiceErrorType::INTERNALRIFTERROR
})?
.octets()
.iter()
.fold(0u32, |v, nv| v << 8 | (*nv as u32)) as IPv4Address
,
prefixlen: 16,
}
)
}
Figure 23: auto_evpn_v4prefixfidevividsid2v4subnet
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/// generic v6 bytes derivation used for different purposes
pub fn auto_evpn_v6hash(fid: FabricIDType, evi: MACVRFNumberType, vid: VLANIDType, sid: UnsignedSystemID)
-> [u8; 8] {
let mut sub = evi.to_ne_bytes().iter()
.fold(RANDOMSEEDS[3], |r, e| r.rotate_left(6) ^ e.rotate_right(4) as u64);
sub ^= fid.to_ne_bytes().iter()
.fold(RANDOMSEEDS[0], |r, e| r.rotate_left(6) ^ e.rotate_right(4) as u64);
sub ^= vid as u64;
sub ^= sid;
sub.to_ne_bytes()
}
Figure 24: auto_evpn_v6hash
/// v6 subnet derivation
pub fn auto_evpn_fidevividsid2v6subnet(fid: FabricIDType, evi: MACVRFNumberType,
vid: VLANIDType,
sid: UnsignedSystemID) -> Result<IPv6PrefixType, ServiceErrorType> {
assert!(NO_MACVRF != evi);
let sb = auto_evpn_v6hash(fid, evi, vid, sid);
let a = format!("{}:{:02X}{:02X}:{:02X}{:02X}:{:02X}{:02X}::1",
auto_evpn_v6irbpref(fid),
sb[3] ^ sb[0],
sb[4] ^ sb[1],
sb[6],
sb[7],
sb[5],
sb[2],
);
Ok(IPv6PrefixType {
address: Ipv6Addr::from_str(
&a)
.map_err(|_| {
ServiceErrorType::INTERNALRIFTERROR
})?
.octets()
.to_vec(),
prefixlen: 64,
})
}
Figure 25: auto_evpn_fidevividsid2v6subnet
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/// MAC address derivation for IRB
pub fn auto_evpn_fidevividsid2mac(fid: FabricIDType, evi: MACVRFNumberType,
vid: VLANIDType, sid: UnsignedSystemID) -> Vec<u8> {
let sb = auto_evpn_v6hash(fid, evi, vid, sid);
vec![0x02,
sb[3] ^ sb[0],
sb[4] ^ sb[1],
sb[6],
sb[7],
sb[5] ^ sb[2],
]
}
Figure 26: auto_evpn_fidevividsid2mac
/// v4 loopback address derivation for every node in auto-evpn, returns address and
/// subnet mask length
pub fn auto_evpn_fidsid2v4loopback(fid: FabricIDType, sid: UnsignedSystemID) -> (IPv4Address, u8) {
let mut derived = sid.to_ne_bytes().iter()
.fold(0 as IPv4Address, |p, e| (p << 4) ^ (*e as IPv4Address));
derived ^= fid as IPv4Address;
// use the byte we loose for entropy
derived ^= derived >> 24;
// and sanitize for loopback range, we nuke 9 bits out
derived &= 0x007f_ffff;
let m = ((127 as IPv4Address) << 24) | derived;
(m as _, 9)
}
Figure 27: auto_evpn_fidsid2v4loopback
/// V6 loopback derivation for every node in auto-evpn
pub fn auto_evpn_fidsidv6loopback(fid: FabricIDType,
sid: UnsignedSystemID) -> Result<Ipv6Addr, ServiceErrorType> {
auto_evpn_v6prefixfidsid2loopback(&auto_evpn_v6pref(fid), fid, sid)
}
Figure 28: auto_evpn_fidsidv6loopback
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#[allow(non_snake_case)]
pub fn auto_evpn_fid2private_AS(fid: FabricIDType) -> u32 {
assert!(fid != NO_FABRIC_ID);
// range 4200000000-4294967294
const DIFF: u32 = 4_294_967_294 - 4_200_000_000;
64496 + ((fid as u32) << 3) % DIFF
}
Figure 29: auto_evpn_fid2private_AS
pub fn auto_evpn_fid2clusterid(fid: FabricIDType) -> u32 {
auto_evpn_fid2private_AS(fid)
}
Figure 30: auto_evpn_fid2clusterid
C.2. Variable Derivation Results
This section contains functional variable derviation results that can
be used as a confirmation that an implementation conforms to
procedures in this document.
+===========+============+=========+===========+========+=====+
| Fabric ID | MAC-VRF ID | VLAN ID | Stretched | VNI | IRB |
+===========+============+=========+===========+========+=====+
| 1 | 1 | 1 | Y | 4097 | 1 |
+-----------+------------+---------+-----------+--------+-----+
| 1 | 1 | 2 | Y | 4098 | 2 |
+-----------+------------+---------+-----------+--------+-----+
| 1 | 1 | 3 | Y | 4099 | 3 |
+-----------+------------+---------+-----------+--------+-----+
| 1 | 1 | 4 | Y | 4100 | 4 |
+-----------+------------+---------+-----------+--------+-----+
| 1 | 1 | 5 | Y | 4101 | 5 |
+-----------+------------+---------+-----------+--------+-----+
| 1 | 1 | 6 | Y | 4102 | 6 |
+-----------+------------+---------+-----------+--------+-----+
| 1 | 1 | 7 | Y | 4103 | 7 |
+-----------+------------+---------+-----------+--------+-----+
| 1 | 1 | 8 | Y | 4104 | 8 |
+-----------+------------+---------+-----------+--------+-----+
| 1 | 1 | 9 | Y | 4105 | 9 |
+-----------+------------+---------+-----------+--------+-----+
| 1 | 1 | 74 | N | 69706 | 74 |
+-----------+------------+---------+-----------+--------+-----+
| 1 | 1 | 75 | N | 69707 | 75 |
+-----------+------------+---------+-----------+--------+-----+
| 1 | 1 | 76 | N | 69708 | 76 |
Head, et al. Expires 1 September 2024 [Page 44]
Internet-Draft RIFT Auto-EVPN February 2024
+-----------+------------+---------+-----------+--------+-----+
| 1 | 1 | 77 | N | 69709 | 77 |
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Head, et al. Expires 1 September 2024 [Page 45]
Internet-Draft RIFT Auto-EVPN February 2024
+-----------+------------+---------+-----------+--------+-----+
| 1 | 2 | 71 | Y | 8263 | 71 |
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Head, et al. Expires 1 September 2024 [Page 46]
Internet-Draft RIFT Auto-EVPN February 2024
+-----------+------------+---------+-----------+--------+-----+
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Head, et al. Expires 1 September 2024 [Page 47]
Internet-Draft RIFT Auto-EVPN February 2024
+-----------+------------+---------+-----------+--------+-----+
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Head, et al. Expires 1 September 2024 [Page 48]
Internet-Draft RIFT Auto-EVPN February 2024
+-----------+------------+---------+-----------+--------+-----+
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Head, et al. Expires 1 September 2024 [Page 49]
Internet-Draft RIFT Auto-EVPN February 2024
+-----------+------------+---------+-----------+--------+-----+
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Head, et al. Expires 1 September 2024 [Page 50]
Internet-Draft RIFT Auto-EVPN February 2024
+-----------+------------+---------+-----------+--------+-----+
| 1 | 6 | 327 | Y | 24903 | 327 |
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Head, et al. Expires 1 September 2024 [Page 51]
Internet-Draft RIFT Auto-EVPN February 2024
+-----------+------------+---------+-----------+--------+-----+
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Head, et al. Expires 1 September 2024 [Page 52]
Internet-Draft RIFT Auto-EVPN February 2024
+-----------+------------+---------+-----------+--------+-----+
| 2 | 1 | 153 | N | 135321 | 153 |
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Head, et al. Expires 1 September 2024 [Page 53]
Internet-Draft RIFT Auto-EVPN February 2024
+-----------+------------+---------+-----------+--------+-----+
| 2 | 2 | 211 | N | 139475 | 211 |
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Head, et al. Expires 1 September 2024 [Page 54]
Internet-Draft RIFT Auto-EVPN February 2024
+-----------+------------+---------+-----------+--------+-----+
| 2 | 3 | 13 | N | 143373 | 13 |
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Head, et al. Expires 1 September 2024 [Page 55]
Internet-Draft RIFT Auto-EVPN February 2024
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| 2 | 4 | 199 | Y | 16583 | 199 |
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Head, et al. Expires 1 September 2024 [Page 56]
Internet-Draft RIFT Auto-EVPN February 2024
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Head, et al. Expires 1 September 2024 [Page 57]
Internet-Draft RIFT Auto-EVPN February 2024
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Head, et al. Expires 1 September 2024 [Page 58]
Internet-Draft RIFT Auto-EVPN February 2024
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Head, et al. Expires 1 September 2024 [Page 59]
Internet-Draft RIFT Auto-EVPN February 2024
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Head, et al. Expires 1 September 2024 [Page 60]
Internet-Draft RIFT Auto-EVPN February 2024
+-----------+------------+---------+-----------+--------+-----+
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Head, et al. Expires 1 September 2024 [Page 61]
Internet-Draft RIFT Auto-EVPN February 2024
+-----------+------------+---------+-----------+--------+-----+
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Head, et al. Expires 1 September 2024 [Page 62]
Internet-Draft RIFT Auto-EVPN February 2024
+-----------+------------+---------+-----------+--------+-----+
| 3 | 3 | 89 | N | 208985 | 89 |
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Head, et al. Expires 1 September 2024 [Page 63]
Internet-Draft RIFT Auto-EVPN February 2024
+-----------+------------+---------+-----------+--------+-----+
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Head, et al. Expires 1 September 2024 [Page 64]
Internet-Draft RIFT Auto-EVPN February 2024
+-----------+------------+---------+-----------+--------+-----+
| 3 | 5 | 461 | N | 217549 | 461 |
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| 3 | 6 | 326 | Y | 24902 | 326 |
Head, et al. Expires 1 September 2024 [Page 65]
Internet-Draft RIFT Auto-EVPN February 2024
+-----------+------------+---------+-----------+--------+-----+
| 3 | 6 | 327 | Y | 24903 | 327 |
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Head, et al. Expires 1 September 2024 [Page 66]
Internet-Draft RIFT Auto-EVPN February 2024
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Head, et al. Expires 1 September 2024 [Page 67]
Internet-Draft RIFT Auto-EVPN February 2024
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| 4 | 1 | 281 | N | 266521 | 281 |
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Head, et al. Expires 1 September 2024 [Page 68]
Internet-Draft RIFT Auto-EVPN February 2024
+-----------+------------+---------+-----------+--------+-----+
| 4 | 2 | 339 | N | 270675 | 339 |
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Head, et al. Expires 1 September 2024 [Page 69]
Internet-Draft RIFT Auto-EVPN February 2024
+-----------+------------+---------+-----------+--------+-----+
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Head, et al. Expires 1 September 2024 [Page 70]
Internet-Draft RIFT Auto-EVPN February 2024
+-----------+------------+---------+-----------+--------+-----+
| 4 | 4 | 199 | Y | 16583 | 199 |
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Head, et al. Expires 1 September 2024 [Page 71]
Internet-Draft RIFT Auto-EVPN February 2024
+-----------+------------+---------+-----------+--------+-----+
| 4 | 5 | 257 | Y | 20737 | 257 |
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Head, et al. Expires 1 September 2024 [Page 72]
Internet-Draft RIFT Auto-EVPN February 2024
+-----------+------------+---------+-----------+--------+-----+
| 4 | 5 | 25 | N | 282649 | 25 |
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Head, et al. Expires 1 September 2024 [Page 73]
Internet-Draft RIFT Auto-EVPN February 2024
+-----------+------------+---------+-----------+--------+-----+
| 4 | 6 | 83 | N | 286803 | 83 |
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| 5 | 1 | 1 | Y | 4097 | 1 |
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| 5 | 1 | 330 | N | 332106 | 330 |
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Head, et al. Expires 1 September 2024 [Page 74]
Internet-Draft RIFT Auto-EVPN February 2024
+-----------+------------+---------+-----------+--------+-----+
| 5 | 1 | 333 | N | 332109 | 333 |
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| 5 | 1 | 342 | N | 332118 | 342 |
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Head, et al. Expires 1 September 2024 [Page 75]
Internet-Draft RIFT Auto-EVPN February 2024
+-----------+------------+---------+-----------+--------+-----+
| 5 | 2 | 71 | Y | 8263 | 71 |
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| 5 | 2 | 267 | N | 336139 | 267 |
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| 5 | 2 | 286 | N | 336158 | 286 |
Head, et al. Expires 1 September 2024 [Page 76]
Internet-Draft RIFT Auto-EVPN February 2024
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Head, et al. Expires 1 September 2024 [Page 77]
Internet-Draft RIFT Auto-EVPN February 2024
+-----------+------------+---------+-----------+--------+-----+
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Head, et al. Expires 1 September 2024 [Page 78]
Internet-Draft RIFT Auto-EVPN February 2024
+-----------+------------+---------+-----------+--------+-----+
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Head, et al. Expires 1 September 2024 [Page 79]
Internet-Draft RIFT Auto-EVPN February 2024
+-----------+------------+---------+-----------+--------+-----+
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Head, et al. Expires 1 September 2024 [Page 80]
Internet-Draft RIFT Auto-EVPN February 2024
+-----------+------------+---------+-----------+--------+-----+
| 5 | 6 | 327 | Y | 24903 | 327 |
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Head, et al. Expires 1 September 2024 [Page 81]
Internet-Draft RIFT Auto-EVPN February 2024
+-----------+------------+---------+-----------+--------+-----+
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Head, et al. Expires 1 September 2024 [Page 82]
Internet-Draft RIFT Auto-EVPN February 2024
+-----------+------------+---------+-----------+--------+-----+
| 6 | 1 | 409 | N | 397721 | 409 |
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Head, et al. Expires 1 September 2024 [Page 83]
Internet-Draft RIFT Auto-EVPN February 2024
+-----------+------------+---------+-----------+--------+-----+
| 6 | 2 | 467 | N | 401875 | 467 |
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Head, et al. Expires 1 September 2024 [Page 84]
Internet-Draft RIFT Auto-EVPN February 2024
+-----------+------------+---------+-----------+--------+-----+
| 6 | 3 | 269 | N | 405773 | 269 |
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Head, et al. Expires 1 September 2024 [Page 85]
Internet-Draft RIFT Auto-EVPN February 2024
+-----------+------------+---------+-----------+--------+-----+
| 6 | 4 | 199 | Y | 16583 | 199 |
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+-----------+------------+---------+-----------+--------+-----+
| 6 | 4 | 341 | N | 409941 | 341 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 4 | 342 | N | 409942 | 342 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 4 | 343 | N | 409943 | 343 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 4 | 344 | N | 409944 | 344 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 4 | 345 | N | 409945 | 345 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 4 | 346 | N | 409946 | 346 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 4 | 347 | N | 409947 | 347 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 4 | 348 | N | 409948 | 348 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 4 | 349 | N | 409949 | 349 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 4 | 350 | N | 409950 | 350 |
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+-----------+------------+---------+-----------+--------+-----+
| 6 | 5 | 257 | Y | 20737 | 257 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 5 | 258 | Y | 20738 | 258 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 5 | 259 | Y | 20739 | 259 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 5 | 260 | Y | 20740 | 260 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 5 | 261 | Y | 20741 | 261 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 5 | 262 | Y | 20742 | 262 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 5 | 263 | Y | 20743 | 263 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 5 | 264 | Y | 20744 | 264 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 5 | 265 | Y | 20745 | 265 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 5 | 138 | N | 413834 | 138 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 5 | 139 | N | 413835 | 139 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 5 | 140 | N | 413836 | 140 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 5 | 141 | N | 413837 | 141 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 5 | 142 | N | 413838 | 142 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 5 | 143 | N | 413839 | 143 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 5 | 144 | N | 413840 | 144 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 5 | 145 | N | 413841 | 145 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 5 | 146 | N | 413842 | 146 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 5 | 147 | N | 413843 | 147 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 5 | 148 | N | 413844 | 148 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 5 | 149 | N | 413845 | 149 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 5 | 150 | N | 413846 | 150 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 5 | 151 | N | 413847 | 151 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 5 | 152 | N | 413848 | 152 |
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+-----------+------------+---------+-----------+--------+-----+
| 6 | 5 | 153 | N | 413849 | 153 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 5 | 154 | N | 413850 | 154 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 5 | 155 | N | 413851 | 155 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 5 | 156 | N | 413852 | 156 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 5 | 157 | N | 413853 | 157 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 5 | 158 | N | 413854 | 158 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 6 | 321 | Y | 24897 | 321 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 6 | 322 | Y | 24898 | 322 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 6 | 323 | Y | 24899 | 323 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 6 | 324 | Y | 24900 | 324 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 6 | 325 | Y | 24901 | 325 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 6 | 326 | Y | 24902 | 326 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 6 | 327 | Y | 24903 | 327 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 6 | 328 | Y | 24904 | 328 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 6 | 329 | Y | 24905 | 329 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 6 | 202 | N | 417994 | 202 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 6 | 203 | N | 417995 | 203 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 6 | 204 | N | 417996 | 204 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 6 | 205 | N | 417997 | 205 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 6 | 206 | N | 417998 | 206 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 6 | 207 | N | 417999 | 207 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 6 | 208 | N | 418000 | 208 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 6 | 209 | N | 418001 | 209 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 6 | 210 | N | 418002 | 210 |
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+-----------+------------+---------+-----------+--------+-----+
| 6 | 6 | 211 | N | 418003 | 211 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 6 | 212 | N | 418004 | 212 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 6 | 213 | N | 418005 | 213 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 6 | 214 | N | 418006 | 214 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 6 | 215 | N | 418007 | 215 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 6 | 216 | N | 418008 | 216 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 6 | 217 | N | 418009 | 217 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 6 | 218 | N | 418010 | 218 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 6 | 219 | N | 418011 | 219 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 6 | 220 | N | 418012 | 220 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 6 | 221 | N | 418013 | 221 |
+-----------+------------+---------+-----------+--------+-----+
| 6 | 6 | 222 | N | 418014 | 222 |
+-----------+------------+---------+-----------+--------+-----+
Table 3: Example Derivation Results
Authors' Addresses
Jordan Head (editor)
Juniper Networks
1137 Innovation Way
Sunnyvale, CA
United States of America
Email: jhead@juniper.net
Tony Przygienda
Juniper Networks
1137 Innovation Way
Sunnyvale, CA
United States of America
Email: prz@juniper.net
Head, et al. Expires 1 September 2024 [Page 89]
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Wen Lin
Juniper Networks
10 Technology Park Drive
Westford, MA
United States of America
Email: wlin@juniper.net
Head, et al. Expires 1 September 2024 [Page 90]