draft-ietf-lsr-isis-srv6-extensions-16.txt   draft-ietf-lsr-isis-srv6-extensions-17.txt 
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Updates: 7370 (if approved) Cisco Systems Updates: 7370 (if approved) Cisco Systems
Intended status: Standards Track A. Bashandy Intended status: Standards Track A. Bashandy
Expires: December 20, 2021 Individual Expires: December 20, 2021 Individual
B. Decraene B. Decraene
Orange Orange
Z. Hu Z. Hu
Huawei Technologies Huawei Technologies
June 18, 2021 June 18, 2021
IS-IS Extensions to Support Segment Routing over IPv6 Dataplane IS-IS Extensions to Support Segment Routing over IPv6 Dataplane
draft-ietf-lsr-isis-srv6-extensions-16 draft-ietf-lsr-isis-srv6-extensions-17
Abstract Abstract
The Segment Routing (SR) architecture allows flexible definition of The Segment Routing (SR) architecture allows flexible definition of
the end-to-end path by encoding it as a sequence of topological the end-to-end path by encoding it as a sequence of topological
elements called "segments". It can be implemented over the MPLS or elements called "segments". It can be implemented over the MPLS or
the IPv6 data plane. This document describes the IS-IS extensions the IPv6 data plane. This document describes the IS-IS extensions
required to support Segment Routing over the IPv6 data plane. required to support Segment Routing over the IPv6 data plane.
This document updates RFC 7370 by modifying an existing registry. This document updates RFC 7370 by modifying an existing registry.
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ISIS SRv6 SID Structure Sub-Sub-TLV MUST NOT appear more than once in ISIS SRv6 SID Structure Sub-Sub-TLV MUST NOT appear more than once in
its parent Sub-TLV. If it appears more than once in its parent Sub- 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. TLV, the parent Sub-TLV MUST be ignored by the receiver.
The sum of all four sizes advertised in ISIS SRv6 SID Structure Sub- The sum of all four sizes advertised in ISIS SRv6 SID Structure Sub-
Sub-TLV MUST be less than or equal to 128 bits. If the sum of all Sub-TLV MUST be less than or equal to 128 bits. If the sum of all
four sizes advertised in the ISIS SRv6 SID Structure Sub-Sub-TLV is four sizes advertised in the ISIS SRv6 SID Structure Sub-Sub-TLV is
larger than 128 bits, the parent Sub-TLV MUST be ignored by the larger than 128 bits, the parent Sub-TLV MUST be ignored by the
receiver. receiver.
The SRv6 SID Sub-Sub-TLV is intended for informational use by the The SRv6 SID Structure Sub-Sub-TLV is intended for informational use
control and management planes. It MUST NOT be used at a transit node by the control and management planes. It MUST NOT be used at a
(as defined in [RFC8754]) for forwarding packets. As an example, transit node (as defined in [RFC8754]) for forwarding packets. As an
this information could be used for: example, this information could be used for:
o validation of SRv6 SIDs being instantiated in the network and o validation of SRv6 SIDs being instantiated in the network and
advertised via ISIS. These can be learnt by controllers via BGP- advertised via ISIS. These can be learnt by controllers via BGP-
LS and then be monitored for conformance to the SRv6 SID LS and then be monitored for conformance to the SRv6 SID
allocation scheme chosen by the operator as described in allocation scheme chosen by the operator as described in
Section 3.2 of [RFC8986]. Section 3.2 of [RFC8986].
o verification and the automation for securing the SRv6 domain by o verification and the automation for securing the SRv6 domain by
provisioning filtering rules at SR domain boundaries as described provisioning filtering rules at SR domain boundaries as described
in Section 5 of [RFC8754]. in Section 5 of [RFC8754].
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