1. BGP Point-to-Multipoint LSP draft-satoru-mpls-bgp-multipoint-02 Satoru Matsushima (satoru@ft.solteria.net) Tetsuya Murakami (tmurakam@cisco.com) Kenichi Nagami (nagami@inetcore.com)

2. Motivation Expand P2MP-LSP enabled area –Cover non-TE area –Cover non-MPLS area and inter-work w/ MPLS p2mp-lsp –Inter-AS/Domain p2mp-lsp BGP is applicable for these motivations

3. Requirements Discover/Notify P2MP capable branch and egress nodes –Applicable for any P2MP signaling protocol –Inter-Domain P2MP LSP P2MP LSP can be used over P2P/MP2P LSP –Migration and co-existing scenarios Policy based P2MP tree decision –Per LSP basis

4. Overview of BGP for P2MP LSP Ingress LSR-a Branch LSR-b Branch LSR-c Egress LSR-d Advertising P2MP-LSP=L Advertising P2MP-LSP=L w/ brach-LSR-b Advertising P2MP-LSP=L w/ branch-LSR-b and c Joined P2MP-LSP=L Upstream LSR=c Label = A Joined P2MP-LSP=L Upstream LSR=b Label = B Joined P2MP-LSP=L Upstream LSR=a Label = C

5. Sender Receiver1Receiver2 Receiver3 BGP P2MP-LSP example Branch LSR2 Ingress LSR1 LSR3 Egress LSR5 Branch LSR4 Egress LSR6 Egress LSR7 P2P-LSP P2MP Instance

6. Proposal New BGP attribute –P2MP_ID (ext community) Identify the P2MP_LSP –P2MP_BRANCH_LIST (ext community) Indicate the branches which traverse P2MP_LSP Detecting and protecting loop –P2MP_IMPORTED_BRANCH (ext community) Indicate the upstream branch of downstream LSR (JOIN) –NLRI Distinguish ingress and each branches uniquely even if in same LSP Label distribution from downstream LSR

7. Data plane of BGP P2MP P2MP instance –The entity of replication and stitching P2P/MP2P LSP –BGP makes policy of which is upstream/downstream for each P2MP LSP Other P2MP signaling can be used –Data plane is separated as P2MP instance –RSVP and LDP may use BGP as find p2mp capable node –Inter-work w/ BGP P2MP-LSP

8. Current status Deployment –Current MPLS network co-existing w/ this solution is working –Validating attribute and behavior Problem –Defining a NLRI for P2MP AFI/SAFI is needed Currently, vpnv4 is used to distinguish p2mp LSP To keep bgp modularity and protecting miss behavior w/ MPLS-VPN

9. Next step Good start point to develop BGP based P2MP discussion –Interest for this work? Adopt as WG item? Please send your comment to the list