1. Multicast State Advertisement in EVPN draft-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 July, 20132IETF 87 Berlin Germany

3. Protocol Extension Multicast State Extended Community ： – state: 0, multicast state is active – state: 1, multicast state is inactive July, 20133IETF 87 Berlin Germany 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 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

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 July, 20134IETF 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 July, 20135IETF 87 Berlin Germany

6. Applications Avoid nonsense BUM forwarding for Ingress Replication Egress Local Protection for P2MP LSP: July, 20136IETF 87 Berlin Germany PE1 PE2 PE6 PE5 PE4 PE3 CE3 CE2 CE1 ES1 BFD Data Main LSP Backup LSP ES1 ES2 ES3 draft-chen-mpls-p2mp-egress-protection

7. Next Step Seek some comments and feedbacks July, 20137IETF 87 Berlin Germany