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Extended - PPT Presentation

BFD Discriminator TLV for MPLS ping draft vgovindan mpls extended bfd disc tlv 00 IETF 90 Toronto ON Vengada Prasad Govindan Nobo Akiya Problem statement Usage of lt ID: 267330

mpls bfd lsr session bfd mpls session lsr tlv lsp egress fec ping introduce established discriminator extended sessions unique

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Slide1

Extended BFD Discriminator TLV for MPLS ping(draft-vgovindan-mpls-extended-bfd-disc-tlv-00)

IETF

-90 Toronto, ON

Vengada Prasad Govindan

Nobo AkiyaSlide2

Problem statementUsage of <MPLS FEC, LSP> as the BFD session de-multiplex key at the LSR egress permits only one BFD session to be established.Use cases involving more than one session per <

MPLS

FEC

,

LSP

>:

Load balancing using entropy labels.

BFD

over

MPLS

LSP

session redundancy.Slide3

DetailsGenerically extend the BFD Discriminator TLV to track more than one session for <MPLS FEC, LSP>Introduce a new TLV

that allows multiple

BFD

session(s) to be established for a given <

MPLS

FEC

,

LSP

>.

LSR

ingress allocated Path identifier added to the

TLV

.

LSR

egress can allocate one unique discriminator for every

LSP

ping with a unique path-identifier received.

Migration of sessions established from the old to the new

TLV

.Slide4

Open ItemsDo we introduce a new procedure to allow the LSR egress to acknowledge the BFD session establishment?LSR egress can respond to MPLS ping with CreateAck opcode in the proposed extended

TLV

.

Do we introduce an explicit mechanism for deleting

BFD

session(s) at the

LSR

egress?

Opcode

based Delete/

DeleteAck

signaled from the

LSR

ingress using

MPLS

ping.

Purge timer based: Remove the

BFD

sessions that

tranisition

from Up->Down after a timer expiry.

Continue with status quo?

Comments and feedback welcome!Slide5

Next stepsDiscuss open items and re-publish before seeking WG adoption.