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Multicast State Advertisement in EVPN draft-li-l2vpn-evpn-multicast-state-ad

Multicast State Advertisement in EVPN draft-li-l2vpn-evpn-multicast-state-ad. Zhenbin Li Junlin Zhang Huawei Technologies July, 2013 Berlin Germany. Problem Statements. There exist nonsense BUM forwarding in Multi-homing scenarios between PE and remote multi-homed PEs

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Multicast State Advertisement in EVPN draft-li-l2vpn-evpn-multicast-state-ad

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  1. Multicast StateAdvertisement in EVPNdraft-li-l2vpn-evpn-multicast-state-ad Zhenbin Li Junlin Zhang Huawei Technologies July, 2013 Berlin Germany

  2. Problem Statements • There exist nonsense BUM forwarding in Multi-homing scenarios • between PE and remote multi-homed PEs • between multi-homed PEs IETF 87 Berlin Germany

  3. Protocol Extension 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type=0x06 | Sub-Type | State (One Octet) | Reserved=0 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Reserved=0 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ • Multicast State Extended Community： • state: 0, multicast state is active • state: 1, multicast state is inactive IETF 87 Berlin Germany

  4. Operations (1) • Advertising multicast state with multicast route： • If the PE has receivers on a broadcast domain, include the Multicast State Extended Community with “0” state in the corresponding Inclusive Multicast Ethernet Tag Route • Otherwise, include the Multicast State Extended Community with “1” state in the Inclusive Multicast Ethernet Tag Route • Receiving multicast state with multicast route： • Send BUM packets to the PEs advertising multicast with “0” state in multicast route IETF 87 Berlin Germany

  5. Operations (2) • Advertising multicast state with Ethernet A-D Route： • If a specific ES of the EVI on the leaf PE does not forward BUM traffic, has receivers on a broadcast domain, include the Multicast State Extended Community with “0” state in the corresponding Ethernet A-D Route per EVI. • Otherwise, include the Multicast State Extended Community with “1” state in the Ethernet A-D Router per EVI • Receiving multicast state with Ethernet A-D Route： • Determine the multicast state of the EVI on the leaf PE • Send BUM packets to the PEs with active multicast state IETF 87 Berlin Germany

  6. Applications • Avoid nonsense BUM forwarding for Ingress Replication • Egress Local Protection for P2MP LSP: BFD PE1 Data CE1 ES1 PE5 ES1 CE3 PE2 ES3 PE6 PE3 Data CE2 ES2 PE4 Main LSP ES2 Backup LSP • draft-chen-mpls-p2mp-egress-protection IETF 87 Berlin Germany

  7. Next Step • Seek some comments and feedbacks IETF 87 Berlin Germany

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