draft-chandra-mpls-rsvp-shared-labels-np-00 Node protection for RSVP-TE tunnels on a shared MPLS forwarding plane draft-chandra-mpls-rsvp-shared-labels-np-00 Chandra Ramachandran (csekar@juniper.net) Vishnu Pavan Beeram (vbeeram@juniper.net) Harish Sitaraman (hsitaraman@juniper.net)

draft-chandra-mpls-rsvp-shared-labels-np-00 Motivation With the procedures specified in [draft-ietf-mpls-rsvp- shared-labels], a shared MPLS forwarding plane can be realized by allowing the TE link label to be shared by LSPs traversing the link. Includes guidelines for providing facility backup link protection at a PLR. This draft proposes guidelines for providing facility backup node protection at a PLR for Segment Routed RSVP-TE tunnels.

Node Protection B C D E At PLR B: draft-chandra-mpls-rsvp-shared-labels-np-00 Node Protection At PLR B: Different node protecting bypass depending on next-next-hop LSR (MP) Cannot use the same TE link label for B-C for LSPs unless next-next-hop LSR is also shared Node protecting Bypass B-D 100 200 B C D 300 Node protecting Bypass B-E E

PLR Procedures for protecting Next-Hop Non-Delegation LSR draft-chandra-mpls-rsvp-shared-labels-np-00 PLR Procedures for protecting Next-Hop Non-Delegation LSR At LSR C, allocate: 321 for the TE link C-B to reach the next-next-hop LSR A 326 for the TE link C-B to reach the next-next-hop LSR F 345 for the TE link C-D to reach the next-next-hop LSR E 348 for the TE link C-D to reach the next-next-hop LSR H etc. Forwarding actions at PLR C: Pop the TE link label and forward the packet to the next-hop LSR Pop the TE link label and the label beneath it and forward the packet over the node protecting bypass tunnel to the next-next-hop LSR (Merge Point). 326 321 348 345 A B C D E 376 378 F G H I

PLR Procedures for protecting Next-Hop Delegation LSR draft-chandra-mpls-rsvp-shared-labels-np-00 PLR Procedures for protecting Next-Hop Delegation LSR ETLD: 2 DHLD: 2 ETLD: 1 DHLD: 2 ETLD: 2 DHLD: 4 ETLD: 1 DHLD: 4 ETLD: 4 DHLD: 4 1300d 1500d A B C D E F ETLD: 3 DHLD: 4 1900d L K J I H G ETLD: 2 DHLD:4 ETLD: 3 DHLD:4 ETLD: 4 DHLD: 4 ETLD: 1 DHLD: 4 ETLD: 2 DHLD: 4 ETLD at LSR C = MIN(computed ETLD = 4, previous hop DHLD = 2). Forwarding actions at PLR B: Pop the TE link label and forward the packet to the next-hop LSR C Pop the TE link label and the label beneath it and and push the label stack on behalf of the next hop delegation LSR C and forwards the packet over the node protecting bypass tunnel to the next-next-hop LSR D (Merge Point).

Backwards Compatibility draft-chandra-mpls-rsvp-shared-labels-np-00 Backwards Compatibility ETLD: 2 DHLD: 2 ETLD: 1 DHLD: 2 ETLD: 4 ETLD: 3 DHLD: 4 ETLD: 2 DHLD: 4 1300d A B C D E F ETLD: 1 DHLD: 4 1500d L K J I H G ETLD: 4 DHLD:4 ETLD: 1 DHLD:4 ETLD: 2 DHLD: 4 ETLD: 3 DHLD: 4 ETLD: 4 DHLD: 4 1700d Delegation hop C does not support the DHLD extensions and hence sets ETLD normally. B cannot push the entire label stack that C would push as a delegation hop. Instead, B can offer link protection.

Next Steps Request WG feedback draft-chandra-mpls-rsvp-shared-labels-np-00 Next Steps Request WG feedback