ISIS extensions for SRv6 draft-bashandy-isis-srv6-extensions-02 Ahmed Bashandy, Cisco Systems Clarence Filsfils, Cisco Systems Les Ginsberg, Cisco Systems Bruno Decraene, Orange Zhibo Hu, Huawei 101st IETF, London, March 2018

Key SRv6 Documents draft-filsfils-spring-srv6-network-programming draft-ietf-6man-segment-routing-header 101st IETF, London, March 2018

draft-li-ospf-ospfv3-srv6-extensions-01 OSPFv3 Equivalent   draft-li-ospf-ospfv3-srv6-extensions-01 Zhenbin Li, Huawei Technologies Zhibo Hu, Huawei Technologies Dean Cheng, Huawei Technologies Ketan Talaulikar, Cisco Systems Peter Psenak, Cisco Systems 101st IETF, London, March 2018

Changes since V1 Alignment with latest Network Programming Draft/function registry and terminology Support for OAM (O-bit in SRH and End.OTP function) added Convert Function Descriptor from sub-TLV to direct encoding in the appropriate TLV/sub-TLVs (multiple functions/SID is not required) Some TLV/sub-TLVs renamed for clarity   101st IETF, London, March 2018

New Advertisements SRv6 Capabilities (sub-TLV of Router Capabilities) SRv6 Node SIDs (new top level TLV) Endpoint functions types associated w SRv6 Node SIDs SRv6 SIDs Associated w a Neighbor (sub-TLVs of IS-Neighbor) 101st IETF, London, March 2018

SRv6 Capabilities Sub-TLV 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 | | Optional sub-sub-TLVs … | Flags +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |E|O| Reserved | E-flag: Indicates router is able to apply "T.Encap“ function O-flag: Indicates the router supports use of the O-bit in SRH (OAM) sub-sub-TLVs: 0 1 2 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type | Length | Value | Used to advertise the support for SRv6 and the limitation on such support 101st IETF, London, March 2018

SRv6 Capabilities Sub-sub-TLVs Max-SL: Maximum Received SL in the SRH Max-End-Pop-SRH: Maximum number of SIDs when applying PSP or USP flavors (0 => not supported) Max-T-Ins-SRH: Maximum number of SIDs when applying T.insert (0 => not supported) Max-T-Encap-SRH: Maximum number of SIDs when applying T.Encap (Valid when E-flag is set) Max-End-D-SRH: Maximum number of SIDs when applying End.DX6 or End.DT6 Used to advertise the support for SRv6 and the limitation on such support 101st IETF, London, March 2018

SRv6 Endpoint Function Descriptor 0 1 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 +-+-+-+-+-+-+-+-+ | Func-flags | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Endpoint Function | No func-flags defined Endpoint Functions: End (no PSP, no USP) End.X with USP End with PSP End.X with PSP&USP End with USP End.DX6 Function End with PSP&USP End.DT6 Function End.X (no PSP, no USP) End.OTP End.X with PSP * E.g. Different leaking/propagating policy Different tagging (e.g admit tags) ** For End and End.DT, not for End.X and End.DX 101st IETF, London, March 2018

SRv6 Node SID TLV Top Level TLV Non-SRv6 capable nodes ignore this TLV Not a prefix to be installed in RIB/FIB Minimum impact on existing routing functionality Advertises SRv6 Node SIDs and the associated attributes Used for SIDs not related to neighbors Does NOT result in routing action on its own Shares sub-TLV space with prefix reachability TLV (135/235/236/237) Can be leaked between levels Advertised SRv6 SID need not be covered by IPv6 prefix reachability (TLV 236 and 237) E.g. may be reachable via static route * E.g. Different leaking/propagating policy Different tagging (e.g admit tags) ** For End and End.DT, not for End.X and End.DX 101st IETF, London, March 2018

SRv6 Node SID 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 | Func-flags | Endpoint function Value | | SID size | SID (variable) . . . | sub-tlv-len | Sub-TLVs (variable) . . . | Flags: 0 1 2 3 4 5 6 7 +-+-+-+-+-+-+-+-+ |D| Reserved | D bit: When the SID is leaked from level-2 to level-1, the D bit MUST be set. Function variants: End, End.OTP * E.g. Different leaking/propagating policy Different tagging (e.g admit tags) ** For End and End.DT, not for End.X and End.DX 101st IETF, London, March 2018

SRv6 Node SID (cont) SID size: 1-128 (typically 128) 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 | Func-flags | Endpoint function Value | | SID size | SID (variable) . . . | sub-tlv-len | Sub-TLVs (variable) . . . | SID size: 1-128 (typically 128) SID: (SID size +7)/8 octets Sub-TLVs: None defined yet * E.g. Different leaking/propagating policy Different tagging (e.g admit tags) ** For End and End.DT, not for End.X and End.DX 101st IETF, London, March 2018

SRv6 Adjacency sub-TLV 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 | Func-flags | Endpoint function Value | | SID size | SID (variable) . . . | sub-tlv-len | Sub-TLVs (variable) . . . | Sub-TLV of neighbor reachability for P2P adjacency Same structure as SRv6 Node SID TLV No flags defined Function variants: End.X, End.DX 101st IETF, London, March 2018

SRv6 LAN Adjacency sub-TLV 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 | System ID (6 octets) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | | | Flags | Func-flags | Endpoint function Value | | SID size | SID (variable) . . . | sub-tlv-len | Sub-TLVs (variable) . . . | Sub-TLV of neighbor reachability for LAN adjacency Same structure as SRv6 Adjacency SID TLV plus neighbor system-id No flags defined Function variants: End.X, End.DX 101st IETF, London, March 2018

Next Step WG adoption 101st IETF, London, March 2018