PIM Extension For Tunnel Based Multicast Fast Reroute (TMFRR) draft-lwei-pim-tmfrr-00 IETF 76, Hiroshima

Motivation Protect native IP multicast and GRE mVPN traffic Protect against both link and node failures Allow multiple tunneling technologies –RSVP/TE, LDP, GRE etc… Support MoFRR behavior IETF 761draft-lwei-pim-tmfrr-00

TMFRR Overview Backup tunnel is pre-built When failure occurs, traffic is redirected around the failed link or node via the TMFRR tunnel –MoFRR mode is also supported MP accepts packets from both native interface and TMFRR tunnel Signaling between MP and PLR is done via PIM extension. IETF 762draft-lwei-pim-tmfrr-00 ASrcB C Rcv xy TMFRR Tunnel Link Under Protection Router A: Pointer of Local Repair(PLR) Router B: Merge Point (MP)

TMFRR Inner Label The MP assigns label X from its own label space. Upon Traffic reroute, PLR pushes label X (assigned by MP) as inner label of packet and sends through a tunnel. On MP, packets with label X are accepted, as alternative to RPF interface check. Backup tunnel can be set up by RSVP-TE or any other tunneling mechanism. IETF 763draft-lwei-pim-tmfrr-00

PIM Extension New PIM Hello option for MP to notify PIM neighbors of backup label X, and router ID over RPF interface under protection New PIM join Attribute to notify RPF neighbor (PLR) of downstream’s backup label X and MP’s RPF interface IP address, and router id. (This is needed only for node protection.) IETF 764draft-lwei-pim-tmfrr-00

PIM Extension TMFRR Hello Option (Short) –8 bytes –L:0 –N:Node Protection bit –M:MoFRR bit IETF 76draft-lwei-pim-tmfrr OptionTypeLength = 8 ReservedLMN

PIM Extension TMFRR Hello Option (Long) –Include TMFRR label –Include router id –L:1 –N:Node Protection bit –M:MoFRR bit IETF 76draft-lwei-pim-tmfrr OptionTypeLength TMFRR Label (20bits)LMNReserved Router ID in Encoded Unicast Address Format

PIM Extension Join Attribute –F: 0 Non-transitive –E: as specified by RFC5384 –M: MoFRR bit –TMFRR label –Route-ID (of MP) –(Multiples of) Address of Downstream Interfaces Under Protection IETF 76draft-lwei-pim-tmfrr TypeReserved TMFRR Label (20bits)Reserved2 Router ID in Encoded Unicast Address Format … FELengthM Address of Downstream Interface under protection

To PIM WG Please comment IETF 768draft-lwei-pim-tmfrr-00