Use of p2mp BFD in PIM-SM (over shared-media segment) - PowerPoint PPT Presentation

Aug 02, 2023 •353 likes •419 views

Use of p2mp BFD in PIM-SM (over shared-media segment) draft-mirsky-pim-bfd-p2mp-use-case Greg Mirsky gregimirsky@gmail.com Ji Xiaoli ji.xiaoli@zte.com.cn IETF-105, July 2019, Montreal Proposed solution RFC 8562 BFD for Multipoint Networks

Use of p2mp BFD in PIM-SM (over shared-media segment) draft-mirsky-pim-bfd-p2mp-use-case Greg Mirsky gregimirsky@gmail.com Ji Xiaoli ji.xiaoli@zte.com.cn IETF-105, July 2019, Montreal
Proposed solution RFC 8562 BFD for Multipoint Networks extends BFD for use in multipoint • and multicast networks PIM DR advertises its BFD My Discriminator in PIM Hello packet (extension • to RFC 7761) to bootstrap p2mp BFD session Non-DR creates a MultipointTail session and uses My Discriminator value • from PIM Hello packet and DR’s IP address to demultiplex BFD control packets Thus the p2mp BFD session has PIM DR router as the MultipointHead and • non-DR routers as MultipointTail. The DR uses the same IP address it uses in PIM Hello as the source IP address for p2mp BFD control packets In p2mp BFD there’s no P-F sequence with interval negotiation and Your • Discriminator must always be zero Detection time is the product of the value in the Desired Min Tx Interval and • the value in the Detect Mult. Field of the last received valid BFD control packet
Extend PIM Hello Checksum PIM Ver Type Reserved OptionType1 OptionLength1 OptionValue1 OptionType2 OptionLength2 OptionValue2 Type Length My Discriminator
Procedures with draft-ietf-pim-dr-improvement DR MUST include BFD TLV in its PIM-Hello message. BFD TLV MUST be • included after DR Address TLV BDR is RECOMMENDED to include BFD TLV in its PIM-Hello message. • BFD TLV MUST be included after BDR Address TLV
Next steps • Comments are welcome • WG LC? Thank you!

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