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ISIS Extensions for MRT. Zhenbin Li, Nan Wu, Quintin Zhao (Huawei) Alia Atlas, Chris Bowers(Juniper) Jeff Tantsura(Ericsson) IETF 88, Vancouver , Canada. Outline: Discussing ISIS-MRT Draft. Overview of ISIS-MRT IS-IS extension for MRT Capability IS-IS extension advertising & parsing

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ISIS Extensions for MRT


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    1. ISIS Extensions for MRT Zhenbin Li, Nan Wu, Quintin Zhao (Huawei) Alia Atlas, Chris Bowers(Juniper) Jeff Tantsura(Ericsson) IETF 88, Vancouver, Canada

    2. Outline: Discussing ISIS-MRT Draft Overview of ISIS-MRT IS-IS extension for MRT Capability IS-IS extension advertising & parsing Next step

    3. Overview of ISIS-MRT • MRT Capability advertisement • Default profile: A new M-bit introduced into MT-TLV(229) . • Non-default profile: A new Sub-TLV planned. • Electing GADAG root • An unique root must be chosed for MRT domain. • One priority is planned for each MRT node. • Root is chosed based on priority comparing.

    4. Overview of ISIS-MRT • MRT Ineligible link advertisement • Option is provided for certain links do not involved into MRT. • A new Sub-TLV is planned for these links. • MRT computation trigger • Topology changes • MRT Capability changes

    5. Outline: Discussing ISIS-MRT Draft Overview of ISIS-MRT IS-IS extension for MRT Capability IS-IS extension advertising & parsing Next step

    6. IS-IS extension for MRT Capability No. of Octets +--------------------------------+ |O |A |M |R | MT ID | 2 +--------------------------------+ M-bit in MT-TLV(229) is used to identify MRT-Capable for default profile. Multiple MT support MRT can have its corresponding M-bit SET. MT-TLV is carried in LSP #0 fragment. MRT-Capability can be updated soon when it changed.

    7. IS-IS extension for MRT Capability No. of Octets +--------------------------------+ |R |R |R |R | MT ID | 2 +----------------+---------------+ | Profile ID | 1 +----------------+ | Priority | 1 +----------------+---------------+ | MRT-Blue MT ID | 2 +--------------------------------+ | MRT-Red MT ID | 2 +--------------------------------+ Sub-TLV is planned in Router CAPABILITY TLV(242) to advertise MRT profile. Extra MRT Blue&Red MT ID is used for customized profile. Multi-instance of Sub-TLV are used to advertise supporting for multiple MRT profile.

    8. IS-IS extension for MRT Capability No. of Octets +--------------------------------+ |R |R |R |R | MT ID | 2 +----------------+---------------+ | Profile ID | 1 +----------------+ | Priority | 1 +----------------+---------------+ | MRT-Blue MT ID | 2 +--------------------------------+ | MRT-Red MT ID | 2 +--------------------------------+ Profile ID is in range [0, 255] with zero as the default profile. Priority is in range [0, 255] with 128 as the default priority. Biggest value win as the root with system-Id as tie-breaker. Non-zero Blue&Red MT ID will overwrite the two ID defined in profile.

    9. IS-IS extension for MRT Capability No. of Octets +--------------------------------+ |R |R |R |R | MT ID | 2 +--------------------------------+----------------+ |System ID and pseudo-node number | 7 +--------------------------------+----------------+ | Default metric | 3 +--------------------------------+ . . . . +--------------------------------+----------------+ |System ID and pseudo-node number | 7 +--------------------------------+----------------+ | Default metric | 3 +--------------------------------+ Sub-TLV is planned in Router CAPABILITY TLV(242) to advertise MRT Ineligible Links. IS-IS links are described as IS Reachability without IP info. Multi-instance of Sub-TLV are allowed. If ineligible-link split MRT Island then need to trigger new computation.

    10. Outline: Discussing ISIS-MRT Draft Overview of ISIS-MRT IS-IS extension for MRT Capability IS-IS extension advertising & parsing Next step

    11. IS-IS extension advertising & parsing MRT should not affect normal IS-IS behavior. MRT info should be ignored if not recognized. MRT info is in level scope. Default MRT profile can be carried MT-TLV in LSP #0 fragment(M-bit). Capability & Ineligible Sub-TLV is optional and carried in Router Capability TLV(242). Multi-instance of MRT is allowed. But care that Blue & Red MT-ID should not conflict in different profile.

    12. Next step Comments and suggestion are welcomed for this draft. Request to be accepted as WG draft.