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Pranjal Kumar Dutta Wim Henderickx Alcatel-Lucent

Upstream LSR Redundancy for Multi-point LDP Tunnels draft-pdutta-mpls-mldp-up-redundancy-00.txt IETF-81. Pranjal Kumar Dutta Wim Henderickx Alcatel-Lucent. Goals. M inimize the service disruption due to node/link failures when mLDP is deployed

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Pranjal Kumar Dutta Wim Henderickx Alcatel-Lucent

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  1. Upstream LSR Redundancy for Multi-point LDP Tunnelsdraft-pdutta-mpls-mldp-up-redundancy-00.txt IETF-81 Pranjal Kumar DuttaWim Henderickx Alcatel-Lucent

  2. Goals • Minimize the service disruption due to node/link failures when mLDP is deployed • The draft proposes a set of procedures that minimize packet loss when an upstream LSR node or link fails. • This document does not change any specifications of mLDP, no interoperability issues.

  3. Topology • Scenario 1: ECMP • Scenario 2: non-ECMP

  4. Procedures (1) • Upstream LSR failure protection can be provided by taking advantage of redundant topologies in service provider networks. • A local LSR Z selects two upstream LSRs • One primary LSR U and at least one backup LSR U'. • Label mappings L sent to U and L' sent to U’ shares the same downstream next-hop label forwarding entries at Z

  5. Procedures (2) • Data packets are received by Z from both U and U' simultaneously. Redundant packets received from U' are discarded by Z. • When Z detects a reachability failure to U then it switches its upstream to the backup LSR U' and packets are immediately available to forward out of each downstream next-hops.

  6. Procedures (3) • Selection of backup upstream LSR • ECMP case • Hash based selection of the candidate upstream LSR(s) • Non ECMP • LFA based selection of the candidate upstream LSR(s)

  7. Next Steps • Adding more text on failure detection/triggers • Propose to adopt this as WG document?

  8. Questions/Comments?

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