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LDP and RSVP Extension for MPLS Muti-Topology Support

Learn about extending IGP support for Multi-Topology and updating LDP and RSVP for MT-ID inclusion, with forwarding options and next steps.

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LDP and RSVP Extension for MPLS Muti-Topology Support

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  1. LDP and RSVP Extension for MPLS Muti-Topology Support draft-zhao-ldp-multi-topology-extension-00 draft-zhao-rsvp-multi-topology-extension-00 Quintin Zhao qzhao@huawei.com Huaimo Chen Huaimochen@huawei.com Luyuang Fang lufang@cisco.com Chao Zhou czhou@cisco.com Lianyuan Li lilianyuan@chinamobile.com Xin Huang huangxin@chinamobile.com

  2. Background: IGP Support MT • IGP is extended to support Multi-Topology • OSPF is extended to support Multi-Topology, RFC 4915 • ISIS is extended to support Multi-Topology, RFC 5120 • Use MT-ID (a 12bit value) to identify logical topologies that overlay one physical topology • IGP (OSPF or IS-IS) computes separate SPF tree for each logical topology

  3. Extend LDP to Support MT-ID • MPLS FEC is extended to include both IP address and MT-ID

  4. Extensions to RSVP-TE • Add MT Information into an object in a message • Add MT Information into SESSION object • Extended P2P SESSION object for IPv4 IPv4 Tunnel End Address Resv MT-ID (12 bits) Tunnel ID Extended Tunnel ID • Extended P2MP SESSION object for IPv4 P2MP ID Resv MT-ID (12 bits) Tunnel ID Extended Tunnel ID

  5. MPLS Forwarding in MT • Option 1: MT is implied by Label • On a LSR, same FEC with different MT-ID are mapped to different Label • Advantages: Nochanges on the forwarding plane • Disadvantages: Label space is limited • Option 2: MT is indicated by stacked Label • One extra label is stacked to indicate a topology • Advantages: Each topology has a full label space • Disadvantages: Forwarding is complicated

  6. Next Step: • Look for the suggestions and comments;

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