Rsvp extension for muti topology support
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RSVP Extension for Muti-Topology Support. draft-zhao-rsvp-multi-topology-extension-00. Quintin Zhao, [email protected] Huaimo Chen, [email protected] Luyuang Fang, [email protected] Chao Zhou, [email protected] Lianyuan Li, [email protected]

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RSVP Extension for Muti-Topology Support

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Rsvp extension for muti topology support

RSVP Extension for Muti-Topology Support

draft-zhao-rsvp-multi-topology-extension-00

Quintin Zhao, [email protected]

Huaimo Chen, [email protected]

Luyuang Fang, [email protected]

Chao Zhou, [email protected]

Lianyuan Li, [email protected]

Xin Huang, [email protected]


Background igp support mt

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


Extensions to rsvp te

Extensions to RSVP-TE

  • 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


Mpls forwarding in mt

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


Next step

Next Step:

  • Look for suggestions and comments;


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