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
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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.