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, qzhao@huawei.com Huaimo Chen, Huaimochen@huawei.com Luyuang Fang, lufang@cisco.com Chao Zhou, czhou@cisco.com Lianyuan Li, lilianyuan@chinamobile.com

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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, 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


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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