BGP Flow Specification for DetNet and TSN Flow Mapping
draft-xiong-idr-detnet-flow-mapping-03
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| Authors | Quan Xiong , Haisheng Wu , Junfeng Zhao , Dong Yang | ||
| Last updated | 2022-09-13 | ||
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draft-xiong-idr-detnet-flow-mapping-03
IDR Q. Xiong
Internet-Draft H. Wu
Intended status: Standards Track ZTE Corporation
Expires: 17 March 2023 J. Zhao
CAICT
D. Yang
Beijing Jiaotong University
13 September 2022
BGP Flow Specification for DetNet and TSN Flow Mapping
draft-xiong-idr-detnet-flow-mapping-03
Abstract
This document proposes extensions to BGP Flow Specification for the
flow mapping of Deterministic Networking (DetNet) when interconnected
with IEEE 802.1 Time-Sensitive Networking (TSN). The BGP flowspec is
used for the filtering of the packets that match the DetNet newtworks
and the mapping between TSN streams and DetNet flows in the control
plane.
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
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material or to cite them other than as "work in progress."
This Internet-Draft will expire on 17 March 2023.
Copyright Notice
Copyright (c) 2022 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
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and restrictions with respect to this document. Code Components
extracted from this document must include Revised BSD License text as
described in Section 4.e of the Trust Legal Provisions and are
provided without warranty as described in the Revised BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Conventions used in this document . . . . . . . . . . . . . . 3
2.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 3
2.2. Requirements Language . . . . . . . . . . . . . . . . . . 3
3. The Requirements for DetNet Control Plane . . . . . . . . . . 3
3.1. Functions for DetNet Flow to TSN Stream Mapping . . . . . 3
3.2. Aggregation during DetNet Flow to TSN Stream Mapping . . 4
4. BGP Extensions for Flow Specification Encoding . . . . . . . 5
4.1. Filtering Rules for TSN Streams . . . . . . . . . . . . . 5
4.2. Traffic Action for TSN Streams . . . . . . . . . . . . . 6
4.3. Filtering Rules for DetNet Flows . . . . . . . . . . . . 7
4.4. Traffic Action for DetNet Flows . . . . . . . . . . . . . 8
5. Security Considerations . . . . . . . . . . . . . . . . . . . 9
6. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 9
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 9
8. Normative References . . . . . . . . . . . . . . . . . . . . 9
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 11
1. Introduction
[RFC8655] specifies the architecture of Deterministic Networking
(DetNet), which provide a capability for the delivery of data flows
with extremely low packet loss rates and bounded end-to-end delivery
latency. DetNet-enabled end systems and DetNet nodes can be
interconnected by sub-networks, i.e., Layer 2 technologies such as
IEEE 802.1 Time-Sensitive Networking (TSN).
As defined in [RFC8655], the DetNet IP and MPLS flows can be carried
over TSN sub-networks. DetNet needs to be mapped to the sub-networks
technology used to interconnect DetNet nodes. For example, a TSN
node may be used to interconnect DetNet-aware nodes, and these DetNet
nodes can map DetNet flows to TSN streams. When the Detnet provide
the deterministic service for the TSN end system, a DetNet edge node
may be used to interconnect the TSN end system, and the DetNet nodes
can map the TSN streams to DetNet flows.
As described in [RFC8938], one of the primary requirements of the
DetNet Controller Plane is restricting flows to IEEE 802.1 TSN and
the requirement could use the centralized network management
provisioning mechanisms such as BGP protocol. As defined in
[RFC8955], the Flow Specifications for BGP is an n-tuple consisting
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of several matching criteria which is comprised of traffic filtering
rules and is associated with actions that can be applied to the
traffic flows. The DetNet edge nodes can provide the capability to
process the traffic including classifing, shaping, rate limiting,
filtering, and redirecting packets based on the policies configured
by the BGP Flow Specification.
BGP flow specification version 1 (FSv1) has been defined in [RFC8955]
and version 2 of the BGP flow specification (FSv2) protocol has been
proposed in [I-D.ietf-idr-flowspec-v2]. This document proposes
extensions to BGP FSv2 for the interconnection of DetNet and TSN.
The BGP flowspec is used for the filtering of the packets that match
the DetNet newtworks and the mapping between TSN streams and DetNet
flows in the control plane.
2. Conventions used in this document
2.1. Terminology
The terminology is defined as [RFC8655], [RFC8938], [RFC8955] and
[I-D.ietf-idr-flowspec-v2].
2.2. 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.
3. The Requirements for DetNet Control Plane
3.1. Functions for DetNet Flow to TSN Stream Mapping
As described in [RFC9024], TSN networks can be interconnected over a
DetNet MPLS Network. And as discussed in [RFC9023] and [RFC9037],
DetNet IP or MPLS networks can be operating over a TSN sub-network.
The mapping between TSN Streams and DetNet flows is required for the
service proxy function at DetNet Edge nodes. And the mapping table
can be configured and maintained in the control plane. When a DetNet
Edge Node receives a packet, it MUST identify and check whether such
flow is present in its mapping table and decide to drop (when not
match) or to forward the packet (when match) to the associated
service.
As Figure 1 shows, it is required to configue the identification
information when mapping received TSN Streams to the DetNet flows at
Edge Node-1. Mechanisms and Parameters of TSN stream identification
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(e.g.,Mask-and-Match Stream identification) defined in [IEEE8021CB]
and [IEEEP8021CBdb] can be used for service proxy function. After
the identification of the TSN stream, it need to map the packet to
the DetNet flow information such as S-Label, d-CW when in DetNet MPLS
data plane and handle the packet as defined in [RFC8964].
When the DetNet Edge Node-2 receives a DetNet flow, it MUST identify
the DetNet flow-ID information such as IP 6-tuple in DetNet IP data
plane or S-Label and d-CW information in DetNet MPLS data plane.
Then the Service proxy function need to map the DetNet flow-ID and
flow related parameters to the associated TSN Stream IDs and streams
related parameters.
TSN Edge Transit Edge TSN
End System Node-1 Node Node-2 End System
+----------+ +----------+
| TSN | <---------End to End TSN Service----------> | TSN |
| Applic. | | Applic. |
+----------+ +.........+ +.........+ +----------+
| | |Service-Proxy Service-Proxy| | |
| TSN | | +.+---+<-- DetNet flow -->+---+.| | | TSN |
| | |TSN| |Svc| |Svc| |TSN| | |
+----------+ +---+ +---+ +----------+ +---+ +---+ +----------+
| L2 | | L2| |Fwd| |Forwarding| |Fwd| |L2 | | L2 |
+------.---+ +-.-+ +-.-+ +---.----.-+ +--.+ +-.-+ +---.------+
: Link : / ,-----. \ : Link : / ,-----. \
+........+ +-[ Sub ]-+ +........+ +-[ TSN ]-+
[Network] [Network]
`-----' `-----'
Flow Mapping:
|TSN : DetNet|<--------- DetNet ---------->|DetNet : TSN|
Figure 1: Figure 1: Flow Mapping in TSN over DetNet Network
3.2. Aggregation during DetNet Flow to TSN Stream Mapping
As described in [RFC8938], the DetNet data plane allows for the
aggregation of DetNet flows, which should also be accomplished in the
control plane. IP, MPLS and TSN aggregation has both data plane and
controller Plane aspects. Bandwidth reservations, resource
assignment, path computation, delay, delay variation and aggregate
number should be taken into considerations in the controller plane.
Moreover, as defined in [RFC9023] and [RFC9037], 1:1 and N:1 mapping
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(aggregating multiple TSN Streams in a single DetNet flow) MUST be
supported.
4. BGP Extensions for Flow Specification Encoding
As defined in [RFC8955], the nodes that applied a Flow Specification
can fillter the received pakects according to the matching criteria
and can forward the flows based on the associated actions. This
document proposes extensions to BGP Flow Specification for the
mapping of DetNet flows and TSN streams by using the traffic
filtering rules to identify the packet and using the associated
action to map the packet to the related service.
4.1. Filtering Rules for TSN Streams
As IEEE Std 802.1Q defined, a Stream ID is a 64-bit field that
uniquely identifies a stream and can be generated by the system
offering the stream, or possibly a device controlling that system.
But it is not carried in the header of the TSN Stream. As defined in
[IEEE8021CB] and [IEEEP8021CBdb], five specific Stream identification
functions are described: Null Stream identification, Source MAC and
VLAN Stream identification, Active Destination MAC and VLAN Stream
identification, and IP Stream identification, and Mask-and-match
Stream identification. It needs to examines the header of the
streams such as destination_address, vlan_identifier, IP source
address, IP destination address, DSCP, IP next protocol, source port,
destination port and mac_service_data_unit.
As defined in [I-D.ietf-idr-flowspec-l2vpn], the Ethernet Layer 2
(L2) related fields has been covered by the L2 traffic filtering
rules except the mac_service_data_unit in Mask-and-Match Stream
identification. A mac_service_data_unit mask is defined to identify
communication flows supported by various higher-layer protocols. L2
Traffic Rules and L2 header TLV in BGP FSv2 of has been defined in
[I-D.ietf-idr-flowspec-v2] section 3.4. This document proposes a new
L2 SubTLV for TSN Streams in L2 Flow Specification Component shown in
Figure 2.
+----------------------------------+
| SubTLV type = TBD1 (1 octet) |
+----------------------------------+
| length (1 octet) |
+ ---------------------------------+
| Mac Service Data Unit (6 octets)|
+----------------------------------+
Figure 2: Figure 2: TSN SubTLV
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SubTLV type = TBD1: Mac Service Data Unit
Encoding: <type (1 octet), length (1 octet), [op, value]+>
Defines a list of {operation, value} pairs used to match 6-octet Mac
Service Data Unit field. Values are encoded as 6-octet quantities.
op is encoded as specified in Section 4.2.1.1 of [RFC8955].
4.2. Traffic Action for TSN Streams
The action for an TSN traffic filtering flowspec is to accept the TSN
streams that matches that particular rule and map the streams to the
DetNet flows. The action for L3 traffic with extended communities
types per [RFC8955] and [RFC8956] such as traffic-rate, traffic-
marking, traffic-action, and redirect can be used for TSN to DetNet
IP flow mapping. The Wide Community has been proposed for FSv2
actions in [I-D.ietf-idr-flowspec-v2] section 3.2.
The DetNet flow is identified by a S-Label and the DetNet Header
consists of d-CW and F-Labels. The MPLS label related action for an
TSN stream mapping to a DetNet MPLS network can use the Label-action
defined in [I-D.ietf-idr-bgp-flowspec-label]. And the action for the
information ensuring deterministic latency, this document proposes a
new Action SubTLV in BGP FSv2 Wide Community for TSN Streams as
following shown.
+======+==============================+==========+
| type | Wide Community | encoding |
+======+==============================+==========+
| TBD2 | Deterministic Latency Action | bitmask |
+------+------------------------------+----------+
Table 1
The Deterministic Latency Action SubTLV is shown in Figure 3.
0 15
+-----------------------------------------------+
| SubTLV type = TBD2 (2 octet) |
+-----------------------------------------------+
| length (2 octet) |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| Flag |Deterministic Latency Information |
+--+--+--+--+ +
| ~ |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
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Figure 3: Figure 3: Deterministic Latency Action
Flag: 4 bits, indicates the type of queuing mechanisms:
Deterministic Latency Information: variable length, the information
when implementing the DetNet queuing mechanisms to guarantee the
deterministic latency. For instance, the cycle ID for cyclic queuing
and forwarding or the latency related information for deadline time
based queuing in order to enable the applicability of the respective
queuing and/or scheduling mechanisms in the large scale network.
4.3. Filtering Rules for DetNet Flows
The L3 traffic filtering rules defined in [RFC8955] and [RFC8956] can
be used for DetNet IP flow.
As defined in RFC8964, the MPLS-based DetNet data plane encapsulation
consists of d-CW, S-Label and F-Labels. The MPLS label filtering
rules have been defined in [I-D.ietf-idr-flowspec-mpls-match]. IP
header TLV in BGP FSv2 of has been defined in
[I-D.ietf-idr-flowspec-v2] section 3.1.
This document proposes a new IP header SubTLV for DetNet MPLS flows
shown in Figure 4.
+----------------------------------+
| SubTLV type = TBD3 (1 octet) |
+----------------------------------+
| length (1 octet) |
+ ---------------------------------+
| Deterministic Latency Information|
| ~ |
+----------------------------------+
Figure 4: Figure 4: DetNet SubTLV
SubTLV Type TBD3:indicates deterministic latency information.
Encoding: <type (1 octet), length (1 octet), [op, value]+>
Defines a list of {operation, value} pairs used to match
Deterministic Latency Information. Values are encoded as variable
length. op is encoded as specified in Section 4.2.1.1 of [RFC8955].
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4.4. Traffic Action for DetNet Flows
The extended action for an DetNet traffic filtering flowspec is to
accept the DetNet flows that matches that particular rule and map the
flows to the TSN streams. This document proposes a new Action SubTLV
in BGP FSv2 Wide Community for DetNet flows as the following shown.
+======+================+==========+
| type | Wide Community | encoding |
+======+================+==========+
| TBD4 | TSN Action | bitmask |
+------+----------------+----------+
Table 2
The TSN Action SubTLV is shown in Figure 3.
0 15
+-----------------------------------------------+
| SubTLV type = TBD4 (2 octet) |
+-----------------------------------------------+
| length (2 octet) |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| Type | Resv |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| TSN-Profile |
| ~ |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
Figure 5: Figure 5: TSN Action
Type: 1-octet, indicates the type of TSN profiles. The value of the
types is TBD:
Resv: 1-octet, reserved for future use. MUST be sent as zero and
ignored on receipt.
TSN-profile: 4-octet, can be converted to the TSN Stream ID and
stream related parameters and requirements as the following shown.
stream_handle: identifying the Stream to which the packet belongs in
TSN networks.
sequence_number: identifying the order in which the packet was
transmitted relative to other packets in the same Compound Stream in
TSN networks.
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traffic_scheduling: identifying the traffic scheduling mechanisms
including traffic policy, queuing and forwarding methods in TSN
networks.
5. Security Considerations
TBA
6. Acknowledgements
TBA
7. IANA Considerations
TBA
8. Normative References
[I-D.ietf-idr-bgp-flowspec-label]
Liang, Q., Hares, S., You, J., Raszuk, R., and D. Ma,
"Carrying Label Information for BGP FlowSpec", Work in
Progress, Internet-Draft, draft-ietf-idr-bgp-flowspec-
label-01, 6 December 2016,
<https://www.ietf.org/archive/id/draft-ietf-idr-bgp-
flowspec-label-01.txt>.
[I-D.ietf-idr-flowspec-l2vpn]
Hao, W., Eastlake, D. E., Litkowski, S., and S. Zhuang,
"BGP Dissemination of L2 Flow Specification Rules", Work
in Progress, Internet-Draft, draft-ietf-idr-flowspec-
l2vpn-19, 18 April 2022, <https://www.ietf.org/archive/id/
draft-ietf-idr-flowspec-l2vpn-19.txt>.
[I-D.ietf-idr-flowspec-mpls-match]
Yong, L., Hares, S., Liang, Q., and J. You, "BGP Flow
Specification Filter for MPLS Label", Work in Progress,
Internet-Draft, draft-ietf-idr-flowspec-mpls-match-01, 6
December 2016, <https://www.ietf.org/archive/id/draft-
ietf-idr-flowspec-mpls-match-01.txt>.
[I-D.ietf-idr-flowspec-v2]
Hares, S., Eastlake, D., Yadlapalli, C., and S. Maduschke,
"BGP Flow Specification Version 2", Work in Progress,
Internet-Draft, draft-ietf-idr-flowspec-v2-00, 19 April
2022, <https://www.ietf.org/archive/id/draft-ietf-idr-
flowspec-v2-00.txt>.
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[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>.
[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>.
[RFC8655] Finn, N., Thubert, P., Varga, B., and J. Farkas,
"Deterministic Networking Architecture", RFC 8655,
DOI 10.17487/RFC8655, October 2019,
<https://www.rfc-editor.org/info/rfc8655>.
[RFC8938] Varga, B., Ed., Farkas, J., Berger, L., Malis, A., and S.
Bryant, "Deterministic Networking (DetNet) Data Plane
Framework", RFC 8938, DOI 10.17487/RFC8938, November 2020,
<https://www.rfc-editor.org/info/rfc8938>.
[RFC8955] Loibl, C., Hares, S., Raszuk, R., McPherson, D., and M.
Bacher, "Dissemination of Flow Specification Rules",
RFC 8955, DOI 10.17487/RFC8955, December 2020,
<https://www.rfc-editor.org/info/rfc8955>.
[RFC8956] Loibl, C., Ed., Raszuk, R., Ed., and S. Hares, Ed.,
"Dissemination of Flow Specification Rules for IPv6",
RFC 8956, DOI 10.17487/RFC8956, December 2020,
<https://www.rfc-editor.org/info/rfc8956>.
[RFC8964] Varga, B., Ed., Farkas, J., Berger, L., Malis, A., Bryant,
S., and J. Korhonen, "Deterministic Networking (DetNet)
Data Plane: MPLS", RFC 8964, DOI 10.17487/RFC8964, January
2021, <https://www.rfc-editor.org/info/rfc8964>.
[RFC9023] Varga, B., Ed., Farkas, J., Malis, A., and S. Bryant,
"Deterministic Networking (DetNet) Data Plane: IP over
IEEE 802.1 Time-Sensitive Networking (TSN)", RFC 9023,
DOI 10.17487/RFC9023, June 2021,
<https://www.rfc-editor.org/info/rfc9023>.
[RFC9024] Varga, B., Ed., Farkas, J., Malis, A., Bryant, S., and D.
Fedyk, "Deterministic Networking (DetNet) Data Plane: IEEE
802.1 Time-Sensitive Networking over MPLS", RFC 9024,
DOI 10.17487/RFC9024, June 2021,
<https://www.rfc-editor.org/info/rfc9024>.
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[RFC9037] Varga, B., Ed., Farkas, J., Malis, A., and S. Bryant,
"Deterministic Networking (DetNet) Data Plane: MPLS over
IEEE 802.1 Time-Sensitive Networking (TSN)", RFC 9037,
DOI 10.17487/RFC9037, June 2021,
<https://www.rfc-editor.org/info/rfc9037>.
Authors' Addresses
Quan Xiong
ZTE Corporation
No.6 Huashi Park Rd
Wuhan
Hubei, 430223
China
Email: xiong.quan@zte.com.cn
Haisheng Wu
ZTE Corporation
Nanjing
Jiangsu,
China
Email: wu.haisheng@zte.com.cn
Junfeng Zhao
CAICT
Beijing
China
Email: zhaojunfeng@caict.ac.cn
Dong Yang
Beijing Jiaotong University
Beijing
China
Email: dyang@bjtu.edu.cn
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