LSR Working Group T. Saad
Internet-Draft V. Beeram
Intended status: Standards Track Juniper Networks
Expires: March 20, 2022 R. Chen
S. Peng
ZTE Corporation
B. Wen
Comcast
D. Ceccarelli
Ericsson
September 16, 2021
IGP Extensions for SR Slice Aggregate SIDs
draft-bestbar-lsr-spring-sa-01
Abstract
Segment Routing (SR) defines a set of topological "segments" within
an IGP topology to enable steering over a specific SR path. These
segments are advertised by the link-state routing protocols (IS-IS
and OSPF).
This document describes extensions to the IS-IS that enable
advertising Slice Aggregate SR segments that share the same IGP
computed forwarding path but offer a forwarding treatment (e.g.
scheduling and drop policy) that is associated with a specific Slice
Aggregate.
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
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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 March 20, 2022.
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Copyright Notice
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document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Requirements Language . . . . . . . . . . . . . . . . . . . . 3
3. Slice Aggregate SIDs for SR-MPLS . . . . . . . . . . . . . . 3
3.1. IS-IS Slice Aggregate Prefix-SID Sub-TLV . . . . . . . . 3
3.2. IS-IS Slice Aggregate Adjacency-SID Sub-TLV . . . . . . . 5
3.3. IS-IS Slice Aggregate LAN Adjacency-SIDs . . . . . . . . 6
4. Slice Aggregate SIDs for SRv6 . . . . . . . . . . . . . . . . 7
4.1. SRv6 SID Slice Aggregate Sub-Sub-TLV . . . . . . . . . . 7
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 8
5.1. SR Slice Aggregate Prefix-SID sub-TLV . . . . . . . . . . 9
5.2. SR Slice Aggregate Adjacency-SID sub-TLV . . . . . . . . 9
5.3. SR Slice Aggregate LAN-Adj-SID sub-TLV . . . . . . . . . 9
5.4. SRv6 SID Slice Aggregate Sub-Sub-TLV . . . . . . . . . . 9
6. Security Considerations . . . . . . . . . . . . . . . . . . . 9
7. Acknowledgement . . . . . . . . . . . . . . . . . . . . . . . 9
8. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 9
9. References . . . . . . . . . . . . . . . . . . . . . . . . . 10
9.1. Normative References . . . . . . . . . . . . . . . . . . 10
9.2. Informative References . . . . . . . . . . . . . . . . . 11
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 12
1. Introduction
The Segment Routing (SR) architecture [RFC8402] defines a set of
topological "segments" within an IGP topology as means to enable
steering over a specific SR end-to-end path. These segments are
advertised by the IGP link-state routing protocols (IS-IS and OSPF).
The SR control plane can be applied to both IPv6 and MPLS data
planes.
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The definition of a network slice for use within the IETF and the
characteristics of IETF network slice are specified in
[I-D.ietf-teas-ietf-network-slice-definition]. A framework for
reusing IETF VPN and traffic-engineering technologies to realize IETF
network slices is discussed in [I-D.nsdt-teas-ns-framework].
[I-D.bestbar-teas-ns-packet] introduces the notion of a Slice
Aggregate as the construct that comprises of one of more IETF network
slice traffic streams. A slice policy can be used to realize a slice
aggregate by instantiating specific control and data plane resources
on select topological elements in an IP/MPLS network.
[I-D.bestbar-spring-scalable-ns] describes an approach to extend SR
to advertiser new SID types called Slice Aggregate (SA) SIDs. Such
SA SIDs are used on a router to define the forwarding action for a
packet (next-hop selection), as well as enforce the specific
treatment (scheduling and drop policy) associated with the Slice
Aggregate.
This document defines the IS-IS and OSPF encodings for the IGP-Prefix
Segment, the IGP-Adjacency Segment, the IGP-LAN-Adjacency Segment
that are required to support the signaling of SR Slice Aggregate SIDs
operating over SR-MPLS and SRv6 dataplanes. When the Slice Aggregate
segments have the same topology (and Algorithm for Prefix-SIDs), the
SA SIDs share the same forwarding path (IGP next-hop(s)), but are
associated with different forwarding treatment (e.g. scheduling and
drop policy) that is associated with the specific Slice Aggregate.
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. Slice Aggregate SIDs for SR-MPLS
Segment Routing can be directly instantiated on the MPLS data plane
through the use of the Segment Routing header instantiated as a stack
of MPLS labels defined in [RFC8402].
3.1. IS-IS Slice Aggregate Prefix-SID Sub-TLV
[RFC8667] defines the IS-IS Prefix Segment Identifier sub-TLV
(Prefix-SID sub-TLV) that is applicable to SR-MPLS dataplane. The
Prefix-SID sub-TLV carries the Segment Routing IGP-Prefix-SID, and is
associated with a prefix advertised by a router.
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A new IS-IS SR Slice Aggregate Prefix-SID (SA Prefix-SID) sub-TLV is
defined to allow a router advertising a prefix to associate multiple
SA Prefix-SIDs to the same prefix. The SA Prefix-SIDs associated
with the same prefix share the same IGP path to the destination
prefix within the specific mapped or customized topology/algorithm
but offer the specific QoS treatment associated with the specific
Slice Aggregate.
The Slice Aggregate ID is carried in the SA Prefix-SID sub-TLV to
associate it to Prefix-SID with a specific Slice Aggregate. The SA
Prefix-SID sub-TLV has the following format:
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type=TBD1 | Length | Flag | Algorithm |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| SA-ID |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| SID/Index/Label(Variable) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 1: SA Prefix-SID sub-TLV for SR-MPLS.
where:
Type: TBD1 (Suggested value to be assigned by IANA)
Length: Variable. Depending on the size of the SID.
The "Flags" and "SID/Index/Label" fields are the same as the
Prefix-SID sub-TLV [RFC8667].
Algorithm: 1 octet. Associated algorithm. Algorithm values are
defined in the IGP Algorithm Type registry
SA-ID: Identifies a specific Slice Aggregate within the IGP
domain.
This sub-TLV MAY be present in any of the following TLVs:
TLV-135 (Extended IPv4 reachability) defined in [RFC5305].
TLV-235 (Multitopology IPv4 Reachability) defined in [RFC5120].
TLV-236 (IPv6 IP Reachability) defined in [RFC5308].
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TLV-237 (Multitopology IPv6 IP Reachability) defined in [RFC5120].
This sub-TLV MAY appear multiple times in each TLV.
3.2. IS-IS Slice Aggregate Adjacency-SID Sub-TLV
[RFC8667] defines the IS-IS Adjacency Segment Identifier sub-TLV
(Adj-SID sub-TLV). The Adj-SID sub-TLV is an optional sub-TLV
carrying the Segment Routing IGP Adjacency-SID as defined in
[RFC8402].
A new SR Slice Aggregate Adjacency-SID (SA Adj-SID) sub-TLV is
defined to allow a router to allocate and advertise multiple SA Adj-
SIDs towards the same IS-IS neighbor (adjacency). The SA Adj-SIDs
allows a router to enforce the specific treatment associated with the
Slice Aggregate.
The Slice Aggregate ID is carried in the SA Adj-SID sub-TLV to
associate it to the specific Slice Aggregate. The SA Adj-SID sub-TLV
has the following format:
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Length | Flags | Weight |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| SA-ID |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| SID/Index/Label(Variable) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 2: SA Adj-SID sub-TLV for SR-MPLS.
where:
Type: TBD2 (Suggested value to be assigned by IANA)
Length: Variable. Depending on the size of the SID.
The "Flags" and "SID/Index/Label" fields are the same as the Adj-
SID sub-TLV [RFC8667].
SA-ID: Identifies a specific Slice Aggregate within the IGP
domain.
This sub-TLV MAY be present in any of the following TLVs:
TLV-22 (Extended IS reachability) [RFC5305].
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TLV-222 (Multitopology IS) [RFC5120].
TLV-23 (IS Neighbor Attribute) [RFC5311].
TLV-223 (Multitopology IS Neighbor Attribute) [RFC5311].
TLV-141 (inter-AS reachability information) [RFC5316].
Multiple Adj-SID sub-TLVs MAY be associated with a single IS-IS
neighbor. This sub-TLV MAY appear multiple times in each TLV.
3.3. IS-IS Slice Aggregate LAN Adjacency-SIDs
In LAN subnetworks, [RFC8667] defines the SR-MPLS LAN-Adj-SID sub-TLV
for a router to advertise the Adj-SID of each of its neighbors.
A new SR Slice Aggregate LAN Adjacency-SID (SA LAN-Adj-SID) sub-TLV
is defined to allow a router to allocate and advertise multiple SA
LAN-Adj-SIDs towards each of its neighbors on the LAN. The SA LAN-
Adj-SIDs allows a router to enforce the specific treatment associated
with the specific Slice Aggregate towards a neighbor.
The Slice Aggregate ID is carried in the SA LAN-Adj-SID sub-TLV to
associate it to the specific Slice Aggregate. The SA LAN-Adj-SID
sub-TLV has the following format:
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type=TBD3 | Length | Flags | Weight |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| SA-ID |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Neighbor System-ID (ID length octets) |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| SID/Label/Index (variable) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 3: SA LAN Adj-SID sub-TLV for SR-MPLS.
where:
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Type: TBD3 (Suggested value to be assigned by IANA)
Length: Variable. Depending on the size of the SID.
The "Flags" and "SID/Index/Label" fields are the same as the LAN-
Adj-SID sub-TLV [RFC8667].
SA-ID: Identifies a specific Slice Aggregate within the IGP
domain.
This sub-TLV MAY be present in any of the following TLVs:
TLV-22 (Extended IS reachability) [RFC5305].
TLV-222 (Multitopology IS) [RFC5120].
TLV-23 (IS Neighbor Attribute) [RFC5311].
TLV-223 (Multitopology IS Neighbor Attribute) [RFC5311].
Multiple LAN-Adj-SID sub-TLVs MAY be associated with a single IS-IS
neighbor. This sub-TLV MAY appear multiple times in each TLV.
Editor Note: the OSPF Sub-TLV sections will be populated in
further update.
4. Slice Aggregate SIDs for SRv6
Segment Routing can be directly instantiated on the IPv6 data plane
through the use of the Segment Routing Header defined in [RFC8754].
SRv6 refers to this SR instantiation on the IPv6 dataplane.
The SRv6 Locator TLV was introduced in
[I-D.ietf-lsr-isis-srv6-extensions] to advertise SRv6 Locators and
End SIDs associated with each locator.
4.1. SRv6 SID Slice Aggregate Sub-Sub-TLV
The SRv6 End SID sub-TLV was introduced in
[I-D.ietf-lsr-isis-srv6-extensions] to advertise SRv6 Segment
Identifiers (SID) with Endpoint behaviors which do not require a
particular neighbor.
The SRv6 End SID sub-TLV is advertised in the SRv6 Locator TLV, and
inherits the topology/algorithm from the parent locator. The SRv6
End SID sub-TLV defined in [I-D.ietf-lsr-isis-srv6-extensions]
carries optional sub-sub-TLVs.
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A new SRv6 Slice Aggregate (SA) SID Sub-Sub-TLV is defined to allow a
router to assign and advertise an SRv6 End SID that is associated
with a specific Slice Aggregate. The SRv6 SID SA Sub-Sub-TLV allows
routers to infer and enforce the specific treatment associated with
the Slice Aggregate on the selected next-hops along the path to the
End SID destination.
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type=TBD4 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| SA-ID |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 4: SRv6 SID SA Sub-Sub-TLV format for SRv6.
where:
Type: TBD4
Length: 4 octets.
SA-ID: Identifies a specific Slice Aggregate within the IGP
domain.
ISIS SRv6 SID SA Sub-Sub-TLV MUST NOT appear more than once in its
parent Sub-TLV. If it appears more than once in its parent Sub- TLV,
the parent Sub-TLV MUST be ignored by the receiver.
The new SRv6 SID SA Sub-Sub-TLV is an optional Sub-Sub-TLV of:
SRv6 End SID Sub-TLV (Section 7.2 of
[I-D.ietf-lsr-isis-srv6-extensions])
SRv6 End.X SID Sub-TLV (Section 8.1 of
[I-D.ietf-lsr-isis-srv6-extensions])
SRv6 LAN End.X SID Sub-TLV (Section 8.2 of
[I-D.ietf-lsr-isis-srv6-extensions])
5. IANA Considerations
This document requests allocation for the following Sub-TLVs.
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5.1. SR Slice Aggregate Prefix-SID sub-TLV
This TLV shares sub-TLV space with existing "Sub-TLVs for TLVs
135,235,226 and 237 registry".
Type: TBD1 (to be assigned by IANA).
5.2. SR Slice Aggregate Adjacency-SID sub-TLV
This TLV shares sub-TLV space with existing "Sub-TLVs for TLVs 22,
222, 23, 223 and 141 registry".
Type: TBD2 (to be assigned by IANA).
5.3. SR Slice Aggregate LAN-Adj-SID sub-TLV
This TLV shares sub-TLV space with existing "Sub-TLVs for TLVs 22,
222, 23, and 223 registry".
Type: TBD3 (to be assigned by IANA).
5.4. SRv6 SID Slice Aggregate Sub-Sub-TLV
Type: TBD4 (to be assigned by IANA).
6. Security Considerations
TBD.
7. Acknowledgement
The authors would like to thank Swamy SRK, and Prabhu Raj Villadathu
Karunakaran for their review of this document, and for providing
valuable feedback on it.
8. Contributors
The following individuals contributed to this document:
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Colby Barth
Juniper Networks
Email: cbarth@juniper.net
Srihari R. Sangli
Juniper Networks
Email: ssangli@juniper.net
Chandra Ramachandran
Juniper Networks
Email: csekar@juniper.net
9. References
9.1. Normative References
[I-D.bestbar-spring-scalable-ns]
Saad, T., Beeram, V. P., Chen, R., Peng, S., Wen, B., and
D. Ceccarelli, "Scalable Network Slicing over SR
Networks", draft-bestbar-spring-scalable-ns-02 (work in
progress), September 2021.
[I-D.bestbar-teas-ns-packet]
Saad, T., Beeram, V. P., Wen, B., Ceccarelli, D., Halpern,
J., Peng, S., Chen, R., Liu, X., Contreras, L. M., and R.
Rokui, "Realizing Network Slices in IP/MPLS Networks",
draft-bestbar-teas-ns-packet-03 (work in progress), July
2021.
[I-D.ietf-lsr-isis-srv6-extensions]
Psenak, P., Filsfils, C., Bashandy, A., Decraene, B., and
Z. Hu, "IS-IS Extensions to Support Segment Routing over
IPv6 Dataplane", draft-ietf-lsr-isis-srv6-extensions-17
(work in progress), June 2021.
[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>.
[RFC5120] Przygienda, T., Shen, N., and N. Sheth, "M-ISIS: Multi
Topology (MT) Routing in Intermediate System to
Intermediate Systems (IS-ISs)", RFC 5120,
DOI 10.17487/RFC5120, February 2008,
<https://www.rfc-editor.org/info/rfc5120>.
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[RFC5305] Li, T. and H. Smit, "IS-IS Extensions for Traffic
Engineering", RFC 5305, DOI 10.17487/RFC5305, October
2008, <https://www.rfc-editor.org/info/rfc5305>.
[RFC5308] Hopps, C., "Routing IPv6 with IS-IS", RFC 5308,
DOI 10.17487/RFC5308, October 2008,
<https://www.rfc-editor.org/info/rfc5308>.
[RFC5311] McPherson, D., Ed., Ginsberg, L., Previdi, S., and M.
Shand, "Simplified Extension of Link State PDU (LSP) Space
for IS-IS", RFC 5311, DOI 10.17487/RFC5311, February 2009,
<https://www.rfc-editor.org/info/rfc5311>.
[RFC5316] Chen, M., Zhang, R., and X. Duan, "ISIS Extensions in
Support of Inter-Autonomous System (AS) MPLS and GMPLS
Traffic Engineering", RFC 5316, DOI 10.17487/RFC5316,
December 2008, <https://www.rfc-editor.org/info/rfc5316>.
[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>.
[RFC8402] Filsfils, C., Ed., Previdi, S., Ed., Ginsberg, L.,
Decraene, B., Litkowski, S., and R. Shakir, "Segment
Routing Architecture", RFC 8402, DOI 10.17487/RFC8402,
July 2018, <https://www.rfc-editor.org/info/rfc8402>.
[RFC8667] Previdi, S., Ed., Ginsberg, L., Ed., Filsfils, C.,
Bashandy, A., Gredler, H., and B. Decraene, "IS-IS
Extensions for Segment Routing", RFC 8667,
DOI 10.17487/RFC8667, December 2019,
<https://www.rfc-editor.org/info/rfc8667>.
[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>.
9.2. Informative References
[I-D.ietf-teas-ietf-network-slice-definition]
Rokui, R., Homma, S., Makhijani, K., Contreras, L. M., and
J. Tantsura, "Definition of IETF Network Slices", draft-
ietf-teas-ietf-network-slice-definition-01 (work in
progress), February 2021.
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[I-D.nsdt-teas-ns-framework]
Gray, E. and J. Drake, "Framework for IETF Network
Slices", draft-nsdt-teas-ns-framework-05 (work in
progress), February 2021.
Authors' Addresses
Tarek Saad
Juniper Networks
Email: tsaad@juniper.net
Vishnu Pavan Beeram
Juniper Networks
Email: vbeeram@juniper.net
Ran Chen
ZTE Corporation
Email: chen.ran@zte.com.cn
Shaofu Peng
ZTE Corporation
Email: peng.shaofu@zte.com.cn
Bin Wen
Comcast
Email: Bin_Wen@cable.comcast.com
Daniele Ceccarelli
Ericsson
Email: daniele.ceccarelli@ericsson.com
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