Network Programming extension: SRv6 uSID instruction
draft-filsfils-spring-net-pgm-extension-srv6-usid-10
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Clarence Filsfils
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Pablo Camarillo
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Dezhong Cai
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Dani Voyer
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Israel Meilik
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Keyur Patel
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Wim Henderickx
,
Prem Jonnalagadda
,
David Melman
,
Yisong Liu
,
Jim Guichard
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2021-03-10
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SPRING C. Filsfils, Ed.
Internet-Draft P. Camarillo, Ed.
Intended status: Standards Track Cisco Systems, Inc.
Expires: September 11, 2021 D. Cai
Alibaba
D. Voyer
Bell Canada
I. Meilik
Broadcom
K. Patel
Arrcus, Inc.
W. Henderickx
Nokia
P. Jonnalagadda
Barefoot Networks
D. Melman
Marvell
Y. Liu
China Mobile
J. Guichard
Futurewei
March 10, 2021
Network Programming extension: SRv6 uSID instruction
draft-filsfils-spring-net-pgm-extension-srv6-usid-10
Abstract
The SRv6 "micro segment" (SRv6 uSID or uSID for short) instruction is
a straightforward extension of the SRv6 Network Programming model:
o The SRv6 Control Plane is leveraged without any change
o The SRH dataplane encapsulation is leveraged without any change
o Any SID in the SID list can carry micro segments
o Based on the Compressed SRv6 Segment List Encoding in SRH
[I-D.filsfilscheng-spring-srv6-srh-comp-sl-enc] framework
This enables:
o ultra-scale (e.g. multi-domain 5G deployments)
o minimum MTU overhead
o installed-base reuse
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Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in BCP
14 [RFC2119] [RFC8174] when, and only when, they appear in all
capitals, as shown here.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on September 11, 2021.
Copyright Notice
Copyright (c) 2021 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
Provisions Relating to IETF Documents
(https://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 4
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 5
3. uSID Allocation within a uSID Block . . . . . . . . . . . . . 6
3.1. GIB, LIB, global uSID and local uSID . . . . . . . . . . 6
3.1.1. Global uSID . . . . . . . . . . . . . . . . . . . . . 6
3.1.2. Local uSID . . . . . . . . . . . . . . . . . . . . . 6
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3.1.3. Reference Illustration . . . . . . . . . . . . . . . 6
4. SRv6 behaviors associated with a uSID . . . . . . . . . . . . 8
4.1. uSID behaviors related to the IGP . . . . . . . . . . . . 8
4.1.1. uN . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.1.2. uA . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.2. uSID Behaviors related to BGP . . . . . . . . . . . . . . 10
4.2.1. uDT . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.2.2. uDX . . . . . . . . . . . . . . . . . . . . . . . . . 10
5. FIB entry at originating node for performant support of
global-local sequence . . . . . . . . . . . . . . . . . . . . 11
6. Routing . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
7. Benefits . . . . . . . . . . . . . . . . . . . . . . . . . . 12
8. Running code . . . . . . . . . . . . . . . . . . . . . . . . 14
8.1. NANOG78 interoperability testing . . . . . . . . . . . . 14
8.2. L3VPN interoperability testing with control-plane . . . . 14
9. Security . . . . . . . . . . . . . . . . . . . . . . . . . . 15
10. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 15
11. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 16
12. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 17
13. References . . . . . . . . . . . . . . . . . . . . . . . . . 20
13.1. Normative References . . . . . . . . . . . . . . . . . . 20
13.2. Informative References . . . . . . . . . . . . . . . . . 21
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 21
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1. Introduction
SRv6 Network Programming [I-D.ietf-spring-srv6-network-programming]
defines a mechanism to build a network program with topological and
service segments. It leverages the SRH [RFC8754] to encode a network
program together with optional metadata shared among the different
SIDs.
This draft extends SRv6 Network Programming with a new type of SRv6
SID behaviors: SRv6 uN, uA, uDT, uDX.
This extension fully leverages the SRv6 network programming solution:
o The SRv6 Control Plane is leveraged without any change
o The SRH dataplane encapsulation is leveraged without any change
o Any SID in the SID list can carry micro segments
o Based on the Compressed SRv6 Segment List Encoding in SRH
[I-D.filsfilscheng-spring-srv6-srh-comp-sl-enc] framework
This enables:
o ultra-scale (e.g. multi-domain 5G deployments)
o minimum MTU overhead
o installed-base reuse
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2. Terminology
The SRv6 Network Programming, SRH and Compressed SRv6 Segment List
Encoding in SRH terminology is leveraged and extended with the
following terms:
+-----------+-------------------------------------------------------+
| Term | Definition |
+-----------+-------------------------------------------------------+
| uSID | A block of uSID's. It can be any IPv6 prefix |
| block | available to the provider. |
+-----------+-------------------------------------------------------+
| uSID | A Compressed-SID. In this document a 16-bit ID. A |
| | different uSID length may be used. |
+-----------+-------------------------------------------------------+
| Active | First uSID after the uSID block. |
| uSID | |
+-----------+-------------------------------------------------------+
| Next uSID | Next uSID after the Active uSID. |
+-----------+-------------------------------------------------------+
| Last uSID | From left to right, the last uSID before the first |
| | End-of-Container uSID. |
+-----------+-------------------------------------------------------+
| End-of- | Reserved uSID used to mark the end of a uSID |
| Container | container. The value 0000 is selected as End-of- |
| | Container. All of the empty uSID container positions |
| | must be filled with the End-of-Container ID. Hence, |
| | the End-of-Container can be present more than once in |
| | a uSID container. |
+-----------+-------------------------------------------------------+
| uSID | A CSID container. A 128bit SRv6 SID of format |
| container | <uSID-Block><Active-uSID><Next-uSID>...<Last- |
| | uSID><End-of-Container>...<End-of-Container>. |
| | A uSID container can be encoded in the Destination |
| | Address of an IPv6 header or at any position in the |
| | Segment List of an SRH. |
+-----------+-------------------------------------------------------+
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3. uSID Allocation within a uSID Block
3.1. GIB, LIB, global uSID and local uSID
GIB: The set of IDs available for global uSID allocation.
LIB: The set of IDs available for local uSID allocation.
3.1.1. Global uSID
A uSID from the GIB.
A Global uSID typically identifies a shortest-path to a node in the
SR domain. An IP route (e.g., /64) is advertised by the parent node
to each of its global uSID's, under the associated uSID block. The
parent node executes a variant of the END behavior.
A node can have multiple global uSID's under the same uSID blocks
(e.g. one per IGP flex-algorithm). Multiple nodes may share the same
global uSID (anycast).
3.1.2. Local uSID
A uSID from the LIB.
A local uSID may identify a cross-connect to a direct neighbor over a
specific interface or a VPN context.
No IP route is advertised by a parent node for its local uSID'.
If N1 and N2 are two different physical nodes of the uSID domain and
I is a local uSID value, then N1 and N2 may bind two different
behaviors to I.
3.1.3. Reference Illustration
For illustration simplicity, we will use:
o uSID block length: 48 bits
o uSID block: 2001:db8:0::/48
o uSID length: 16 bits
o uSID: 2001:db8:0:XYZW::/64
o GIB: nibble X from hexa(0) to hexa(D)
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o LIB: nibble X hexa(E) or hexa(F)
Leveraging our reference illustration,
o A uSID 2001:db8:0:XYZW::/64 is said to be allocated from its block
(2001:db8:0::/48).
o More specifically, a uSID is allocated from the GIB or LIB of
block 2001:db8:0::/48 depending on the value of the "X" nibble:
0-D for GIB, and E-F for LIB.
o With the above allocation scheme, the uSID Block 2001:db8:0::/48
supports up to 57k global uSID's (e.g. routers) while each router
would support up to 8k local uSID's.
Another illustration could assume a 32-bit uSID length and a LIB
restricted to the uSIDs with the first byte set to FF. In this
context, the network as a whole would support 2^32-2^24 global uSID's
(e.g. routers) while each router would support up to 2^24 local
uSID's.
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4. SRv6 behaviors associated with a uSID
The SRv6 SRH encapsulation and its network programming model are
extended with the following functions:
4.1. uSID behaviors related to the IGP
4.1.1. uN
The uN is a short notation for the End behavior with NEXT-CSID, PSP
and USD flavors as defined in
[I-D.filsfilscheng-spring-srv6-srh-comp-sl-enc].
As a reminder the pseudo-code of the End behavior with NEXT-CSID
flavor, when applied to a 48b uSID block and a 16b uSID length is as
follows:
2001:db8:0:0N00::/64 bound to the pseudocode shift-and-lookup:
1. Copy DA[64..127] into DA[48..111] ;; Ref1
2. Set DA[112..127] to 0x0000
3. Forward the packet to the new DA
2001:db8:0:0N00::/80 bound to the End behavior with PSP & USD flavors
Ref 1: DA[X..Y] refers to the bits from position X to Y (included) in
the IPv6 Destination Address of the received packet. The bit 0 is
the MSB, while the bit 127 is the LSB.
4.1.1.1. Control-plane representation
In ISIS [I-D.ietf-lsr-isis-srv6-extensions], a uN is advertised with
the following information:
o Value = 2001:db8:0:0N00::
o Behavior = uN
o Structure =
* LBL = 48
* LNL = 16
* FL = 0
* AL = 64
o Algorithm = 0 (or other)
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4.1.2. uA
The uA local behavior is a short notation for the End.X behavior with
NEXT-CSID, PSP and USD flavors
[I-D.filsfilscheng-spring-srv6-srh-comp-sl-enc].
An instance of the uA SRv6 uSID behavior is associated with a set, J,
of one or more Layer-3 adjacencies.
As a reminder the pseudo-code of the End.X behavior with NEXT-CSID
flavor, when applied to a 48b uSID block and a 16b uSID length is as
follows:
2001:db8:0:FNAJ::/64 bound to the pseudocode shift-and-xconnect:
1. Copy DA[64..127] into DA[48..111] ;; Ref1
2. Set DA[112..127] to 0x0000
3. Forward to layer-3 adjacency J
2001:db8:0:FNAJ::/80 bound to the End.X behavior w PSP & USD flavors
Ref 1: DA[X..Y] refers to the bits from position X to Y (included) in
the IPv6 Destination Address of the received packet. The bit 0 is
the MSB, while the bit 127 is the LSB.
4.1.2.1. Control-plane representation
In ISIS [I-D.ietf-lsr-isis-srv6-extensions], a uA is advertised with
the following information:
o Value = 2001:db8:0:0N00:FNAJ::
o Behavior = uA
o Structure =
* LBL = 48
* LNL = 16
* FL = 16
* AL = 48
o Algorithm = 0 (or other)
Note: From a formal viewpoint, a uA SID of node N is defined by the
local FIB entry B:uA/64 of N (i.e. this definition is independent
from any uN SID of node N). In order to signal in ISIS a container
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SID with the same routable semantics as End.X, the ISIS advertisement
of a uA SID is done as uN+uA. uN provides the global route to the
node like the End behavior. uA provides the cross-connect function
like the "X" of the End.X.
4.2. uSID Behaviors related to BGP
4.2.1. uDT
A local uDT behavior of Node D 2001:db8:0:FNVT:: is defined by the
following single FIB entry and pseudo-code:
2001:db8:0:FNVT::/80 bound to the same pseudocode as End.DT4/End.DT6/
End.DT2*
4.2.1.1. Control-plane representation
In BGP [I-D.ietf-bess-srv6-services], a uDT is advertised with the
following information:
o Value = 2001:db8:0:0N00:FNVT::
o Behavior = uDT
o Structure =
* LBL = 48
* LNL = 16
* FL = 16
* AL = 0
* TL = 16
* TO = 64
o Algorithm = 0 (or other)
Note: the advertised SID value includes the uN SRv6 uSID of the
parent.
4.2.2. uDX
A local uDX behavior of Node D 2001:db8:0:FNXJ:: is defined by the
following single FIB entry and pseudo-code:
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2001:db8:0:FNXJ::/80 bound to the same pseudocode as End.DX4/End.DX6/
End.DX2
4.2.2.1. Control-plane representation
In BGP [I-D.ietf-bess-srv6-services], a uDX is advertised with the
following information:
o Value = 2001:db8:0:0N00:FNXJ::
o Behavior = uDX
o Structure =
* LBL = 48
* LNL = 16
* FL = 16
* AL = 0
* TL = 16
* TO = 64
o Algorithm = 0 (or other)
Note: the advertised SID value includes the uN SRv6 uSID of the
parent.
5. FIB entry at originating node for performant support of global-local
sequence
Any originating parent node may install the sequence of <Global,
Local> uSID to perform more efficient processing given the LPM
lookup.
For example, a parent node N that has the following FIB entries:
o 2001:db8:0:0N00::/64 bound to the pseudocode shift-and-lookup
o 2001:db8:0:0N00:0000::/80 bound to the End behavior with PSP&USD
flavors
o 2001:db8:0:FNAJ::/64 bound to the pseudocode shift-and-xconnect
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o 2001:db8:0:FNAJ:0000:/80 bound to the End.X behavior with PSP&USD
flavors
may install the following additional FIB entries:
o 2001:db8:0:0N00:FNAJ::/80 bound to the pseudocode shift-and-
xconnect (with 32b shifting)
o 2001:db8:0:0N00:FNAJ:0000::/96 bound to the End.X behavior with
PSP&USD flavors
6. Routing
If Node 1 is configured with a uN SID 2001:db8:0:0100::/64 then the
operator must ensure that Node 1 advertises 2001:db8:0:0100::/64 in
the routing protocol.
7. Benefits
o Leverages SRv6 Network Programming with NO change
* SRv6 uSID is a flavor of the SRv6 network programming model
o Leverages SRv6 dataplane (SRH) with NO change
* Any SID in DA or SRH can be an SRv6 uSID container
o Leverages SRv6 Control-Plane with NO change
o Ultra-Scale
* 6 uSID's per uSID container
* 18 source routing waypoints in only 40bytes of overhead
+ H.Encaps.Red with an SRH of 40 bytes (8 fixed + 2 * 16
bytes)
+ 6 uSID's in DA and 12 in SRH
o Lowest MTU overhead
* In apple to apple comparison, the SRv6 solution outperforms any
alternative (VxLAN with SR-MPLS, CRH).
o Scalable number of globally unique nodes in the domain
* 16-bit uSID: 65k uSIDs per domain block
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* 32-bit uSID: 4.3M uSIDs per domain block
o Proven Hardware-friendliness
* Leverages mature hardware capabilities (Inline DA edit, DA
longest match)
* Avoids any extra lookup in indexed mapping table
* Demonstrated by the number of linerate interoperable hardware
implementations at the first Interop report in February 2020,
less than 9 months after the first public version of this
document.
* Public operator report of leverage of installed base
* A micro-program which requires less than 6 uSID's only requires
legacy IPinIP encapsulation behavior
o Scalable Control-Plane
* No indexed mapping table is required
* Summarization at area/domain boundary provides massive scaling
advantage
* No routing extension is required: a simple prefix advertisement
suffices
o Seamless Deployment
* A uSID may be used as a SID: i.e. the container holds a single
uSID
* The inner structure of an SR Policy can stay opaque to the
source: i.e. a container with uSID's is just seen as a SID by
the policy headend
o Security
* Leverages SRv6's native SR domain security
o Large-Scale DC
* SID's may be used to address applications on hosts (scale in
2^128)
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* Hardware friendliness of uSID's may be used to specify billions
of waypoints in cost/power-optimized DC fabric
8. Running code
8.1. NANOG78 interoperability testing
The hardware and software platforms listed have participated in a
joint interoperability testing of the uN instruction defined in this
document.
Hardware implementations (in alphabetical order):
o Arrcus ArcOS (based on Broadcom Jericho2)
o Barefoot Tofino P4-programmable Ethernet switch ASIC
o Cisco 8000 Series Routers (based on Cisco Silicon One Q100)
o Cisco ASR9000 platform (with 3rd gen Tomahawk and 4th gen
Lightspeed line-cards)
o Cisco NCS5500 platform (based on Broadcom Jericho/Jericho+)
o Marvell Prestera Packet Processor
Software open-source implementations (in alphabetical order):
o FD.io VPP
o Linux Kernel
Further details are available in the [NANOG78].
8.2. L3VPN interoperability testing with control-plane
In December 2020 the following routing platforms have participated in
a successful interoperability testing including the uDT instruction
and its BGP control-plane signalling.
o Arrcus ArcOS
o Cisco ASR9000 with IOS-XR
o Cisco NCS5500 with IOS-XR
o Cisco XRv9k with IOS-XR
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o FD.io VPP with GoBGP
Further details are available in [L3VPN-INTEROP].
9. Security
The security rules defined in Section 7 of
[I-D.ietf-spring-srv6-network-programming], protect intra-domain
deployments that includes SRv6 uSID.
10. IANA Considerations
This document requests IANA to allocate the following codepoints
within the "SRv6 Endpoint Behaviors" sub-registry under the top-level
"Segment Routing Parameters" registry.
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+-------+--------+--------------------------------------+-----------+
| Value | Hex | Endpoint behavior | Reference |
+-------+--------+--------------------------------------+-----------+
| 42 | 0x002A | End with NEXT-ONLY-CSID | [This.ID] |
| 43 | 0x002B | End with NEXT-CSID | [This.ID] |
| 44 | 0x002C | End with NEXT-CSID & PSP | [This.ID] |
| 45 | 0x002D | End with NEXT-CSID & USP | [This.ID] |
| 46 | 0x002E | End with NEXT-CSID, PSP & USP | [This.ID] |
| 47 | 0x002F | End with NEXT-CSID & USD | [This.ID] |
| 48 | 0x0030 | End with NEXT-CSID, PSP & USD | [This.ID] |
| 49 | 0x0031 | End with NEXT-CSID, USP & USD | [This.ID] |
| 50 | 0x0032 | End with NEXT-CSID, PSP, USP & USD | [This.ID] |
| 51 | 0x0033 | End.X with NEXT-ONLY-CSID | [This.ID] |
| 52 | 0x0034 | End.X with NEXT-CSID | [This.ID] |
| 53 | 0x0035 | End.X with NEXT-CSID & PSP | [This.ID] |
| 54 | 0x0036 | End.X with NEXT-CSID & USP | [This.ID] |
| 55 | 0x0037 | End.X with NEXT-CSID, PSP & USP | [This.ID] |
| 56 | 0x0038 | End.X with NEXT-CSID & USD | [This.ID] |
| 57 | 0x0039 | End.X with NEXT-CSID, PSP & USD | [This.ID] |
| 58 | 0x003A | End.X with NEXT-CSID, USP & USD | [This.ID] |
| 59 | 0x003B | End.X with NEXT-CSID, PSP, USP & USD | [This.ID] |
| 60 | 0x003C | End.DX6 with NEXT-CSID | [This.ID] |
| 61 | 0x003D | End.DX4 with NEXT-CSID | [This.ID] |
| 62 | 0x003E | End.DT6 with NEXT-CSID | [This.ID] |
| 63 | 0x003F | End.DT4 with NEXT-CSID | [This.ID] |
| 64 | 0x0040 | End.DT46 with NEXT-CSID | [This.ID] |
| 65 | 0x0041 | End.DX2 with NEXT-CSID | [This.ID] |
| 66 | 0x0042 | End.DX2V with NEXT-CSID | [This.ID] |
| 67 | 0x0043 | End.DT2U with NEXT-CSID | [This.ID] |
| 68 | 0x0044 | End.DT2M with NEXT-CSID | [This.ID] |
+-------+--------+--------------------------------------+-----------+
Table 1: IETF - SRv6 Endpoint Behaviors
11. Acknowledgements
The authors would like to acknowledge Francois Clad, Peter Psenak,
Ketan Talaulikar, Jakub Horn, Swadesh Agrawal, Zafar Ali, Darren
Dukes, Kiran Sasidharan, Junaid Israr, Lakshmanan Srikanth, Asif
Islam, Saleem Hafeez, Michael MacKenzie, Sushek Shekar, YuanChao Su,
Alexander Preusche, Alberto Donzelli, Miya Kohno, David Smith, Ianik
Semco, Bertrand Duvivier, Frederic Trate, Kris Michielsen, Eyal
Dagan, Eli Stein, Ofer Iny, Elad Naor, Guy Caspari, Mel Tsai, Anand
Sridharan, Aviad Behar, Joseph Chin.
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12. Contributors
Jisu Bhattacharyaa
Cisco Systems, Inc.
United States of America
Email: jisu@cisco.com
Kamran Raza
Cisco Systems, Inc.
Canada
Email: skraza@cisco.com
John Bettink
Cisco Systems, Inc.
United States of America
Email: jbettink@cisco.com
Tomonobu Niwa
KDDI
Japan
Email: to-niwa@kddi.com
Luay Jalil
Verizon
United States of America
Email: luay.jalil@one.verizon.com
Zhichun Jiang
Tencent
China
Email: zcjiang@tencent.com
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Ahmed Shawky
Saudi Telecom Company
Saudi Arabia
Email: ashawky@stc.com.sa
Nic Leymann
Deutsche Telekom
Germany
Email: N.Leymann@telekom.de
Dirk Steinberg
Lapishills Consulting Limited
Cyprus
Email: dirk@lapishills.com
Shawn Zandi
LinkedIn
United States of America
Email: szandi@linkedin.com
Gaurav Dawra
LinkedIn
United States of America
Email: gdawra@linkedin.com
Jim Uttaro
AT&T
United States of America
Email: ju1738@att.com
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Ning So
Reliance
United States of America
Email: Ning.So@ril.com
Michael Fiumano
Sprint
United States of America
Email: michael.f.fiumano@sprint.com
Mazen Khaddam
Cox
United States of America
Email: Mazen.Khaddam@cox.com
Jichun Ma
China Unicom
China
Email: majc16@chinaunicom.cn
Satoru Matsushima
Softbank
Japan
Email: satoru.matsushima@g.softbank.co.jp
Francis Ferguson
CenturyLink
United States of America
Email: Francis.Ferguson@centurylink.com
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Takuya Miyasaka
KDDI
Japan
Email: ta-miyasaka@kddi.com
Kentaro Ebisawa
Toyota Motor Corporation
Japan
Email: ebisawa@toyota-tokyo.tech
Yukito Ueno
NTT Communications Corporation
Japan
Email: yukito.ueno@ntt.com
13. References
13.1. Normative References
[I-D.filsfilscheng-spring-srv6-srh-comp-sl-enc]
Cheng, W., Filsfils, C., Li, Z., Cai, D., Voyer, D., Clad,
F., Zadok, S., Guichard, J., and L. Aihua, "Compressed
SRv6 Segment List Encoding in SRH", draft-filsfilscheng-
spring-srv6-srh-comp-sl-enc-02 (work in progress),
November 2020.
[I-D.ietf-spring-srv6-network-programming]
Filsfils, C., Camarillo, P., Leddy, J., Voyer, D.,
Matsushima, S., and Z. Li, "SRv6 Network Programming",
draft-ietf-spring-srv6-network-programming-28 (work in
progress), December 2020.
[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>.
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[RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
May 2017, <https://www.rfc-editor.org/info/rfc8174>.
[RFC8754] Filsfils, C., Ed., Dukes, D., Ed., Previdi, S., Leddy, J.,
Matsushima, S., and D. Voyer, "IPv6 Segment Routing Header
(SRH)", RFC 8754, DOI 10.17487/RFC8754, March 2020,
<https://www.rfc-editor.org/info/rfc8754>.
13.2. Informative References
[I-D.ietf-bess-srv6-services]
Dawra, G., Filsfils, C., Talaulikar, K., Raszuk, R.,
Decraene, B., Zhuang, S., and J. Rabadan, "SRv6 BGP based
Overlay services", draft-ietf-bess-srv6-services-05 (work
in progress), November 2020.
[I-D.ietf-lsr-isis-srv6-extensions]
Psenak, P., Filsfils, C., Bashandy, A., Decraene, B., and
Z. Hu, "IS-IS Extension to Support Segment Routing over
IPv6 Dataplane", draft-ietf-lsr-isis-srv6-extensions-11
(work in progress), October 2020.
[L3VPN-INTEROP]
Cisco Systems, Inc. and Arrcus, "SRv6 uSID L3VPN
Interopability Testing", L3VPN Interop , December 2020,
<https://www.segment-routing.net/demos/2020-12-22-SRv6-
uSID-L3VPN-interoperability/>.
[NANOG78] Filsfils, C., "SRv6 Technology and Deployment Use-cases",
NANOG78 , February 2020, <https://storage.googleapis.com/
site-media-prod/meetings/NANOG78/2097/20200212_Mcdougall_S
rv6_Technology_And_v1.pdf>.
Authors' Addresses
Clarence Filsfils (editor)
Cisco Systems, Inc.
Belgium
Email: cf@cisco.com
Pablo Camarillo Garvia (editor)
Cisco Systems, Inc.
Spain
Email: pcamaril@cisco.com
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Dennis Cai
Alibaba
China
Email: d.cai@alibaba-inc.com
Daniel Voyer
Bell Canada
Canada
Email: daniel.voyer@bell.ca
Israel Meilik
Broadcom
Israel
Email: israel.meilik@broadcom.com
Keyur Patel
Arrcus, Inc.
United States of America
Email: keyur@arrcus.com
Wim Henderickx
Nokia
Belgium
Email: wim.henderickx@nokia.com
Prem Jonnalagadda
Barefoot Networks
United States of America
Email: prem@barefootnetworks.com
David Melman
Marvell
Israel
Email: davidme@marvell.com
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Yisong Liu
China Mobile
China
Email: liuyisong@chinamobile.com
James Guichard
Futurewei
United States of America
Email: james.n.guichard@futurewei.com
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