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Multi-Topology/Multi-Instance IS-IS for IPv4-Embedded IPv6 draft-boucadair-isis-v4v6-mt-02

Multi-Topology/Multi-Instance IS-IS for IPv4-Embedded IPv6 draft-boucadair-isis-v4v6-mt-02. Mohamed Boucadair (mohamed.boucadair@orange-ftgroup.com) Christian Jacquenet (christian.jacquenet@orange-ftgroup.com) Dean Cheng (chengd@huawei.com) Yiu Lee (yiu_lee@cable.comcast.com) IETF77, Anaheim.

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Multi-Topology/Multi-Instance IS-IS for IPv4-Embedded IPv6 draft-boucadair-isis-v4v6-mt-02

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  1. Multi-Topology/Multi-Instance IS-ISfor IPv4-Embedded IPv6draft-boucadair-isis-v4v6-mt-02 Mohamed Boucadair (mohamed.boucadair@orange-ftgroup.com) Christian Jacquenet (christian.jacquenet@orange-ftgroup.com) Dean Cheng (chengd@huawei.com) Yiu Lee (yiu_lee@cable.comcast.com) IETF77, Anaheim

  2. The Motivation • In some scenarios during IPv6 transition, there is a need to inject IPv4-Embbedded IPv6 addresses into IPv6 networks for the purpose of routing IPv4-Embedded IPv6 packets across IPv6 network, where IS-IS is the routing protocol • Ongoing work in BEHAVE WG and SOFTWIRE WG • IPv4-Embedded IPv6 address is defined in: http://tools.ietf.org/html/draft-ietf-behave-address-format-04.txt • i.e., an IPv6 address contains a 32-bit IPv4 address • In doing so, it is desirable to reduce the impact on the normal IS-IS operation (performance, scaling, routing table size, etc.) by constructing a separate IPv4-Embedded IPv6 topology using: RFC5120 - M-ISIS: Multi Topology in IS-IS, or: draft-ietf-isis-mi-02 - IS-IS Multi-Instance

  3. IPv6 IPv4 IPv4-Embedded IPv6 addresses are advertised in partial IPv6 backbone An example: IPv4-Embedded IPv6 IPv4-Embedded IPv6 addresses are advertised in the IPv6 backbone IPv4 IPv6 IPv6 IPv6 backbone IPv4 ASBR

  4. Provisioning… • Use IS-IS multi-topology mechanism • Reference: RFC5120 - M-ISIS: Multi Topology in IS-IS • Configure MT ID on interfaces for IPv4-Embedded unicast IPv6 routing • Configure MT ID on interfaces for IPv4-Embedded multicast IPv6 routing • Use IS-IS multi-instance mechanism • Reference: draft-ietf-isis-mi-02 - IS-IS Multi-Instance • Instantiate a separate instance (IID) for IPv4-Embedded unicast IPv6 routing • Instantiate a separate instance (IID) for IPv4-Embedded multicast IPv6 routing

  5. Request for IANA number assignments • New IS-IS Multi-Topology ID (MT ID) • MT ID tbs-1 for IPv4-Embedded IPv6 unicast routing topology • MT ID tbs-2 for IPv4-Embedded IPv6 multicast routing topology • Reference: RFC5120 - M-ISIS: Multi Topology in IS-IS • New IS-IS Multi-Instance ID (IID) • Following the requirement of the IS-IS MI draft • Reference: draft-ietf-isis-mi-02 - IS-IS Multi-Instance

  6. Next Step … • Authors would like to solicit comments with discussion on mailing list at this time • If there is enough interest, we’ll propose to move this I-D as a working group document

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