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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 |