Flow aware pw for vpls draft yong l2vpn fat pw 4 vpls 00 txt
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Flow Aware PW for VPLS draft-yong-l2vpn-fat-pw-4-vpls-00.txt. [email protected] ECMP Paths. Flow Aware PW (FA-PW). Flow Aware PW & VPLS. Flow Aware PW (FA-PW) lets a PW to take advantage of ECMP and LAG Flow label provides addition flow granularity in a PW

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Flow aware pw for vpls draft yong l2vpn fat pw 4 vpls 00 txt

Flow Aware PW for VPLS draft-yong-l2vpn-fat-pw-4-vpls-00.txt

[email protected]

IETF79, Beijing China


Flow aware pw vpls

ECMP Paths

Flow Aware PW (FA-PW)

Flow Aware PW & VPLS

  • Flow Aware PW (FA-PW) lets a PW to take advantage of ECMP and LAG

    • Flow label provides addition flow granularity in a PW

    • Individual flows in a PW are distributed over multi-paths

    • FA-PW BW may be larger than individual path BW

    • Draft-ietf-pwe3-fat-pw-04.txt

  • VPLS uses PW for transport between PEs

    • RFC4761 is BGP based

    • RFC4762 is LDP based

IETF79, Beijing China


Flow aware pw for vpls

FA-PW

VSI

VSI

ACs

ACs

PE1

PE2

Flow Aware PW for VPLS

  • Advantage to use FA-PW for VPLS

    • Most of VPLS services carry IP payload

    • VPLS traffic between a pair of PEs can be larger than single path capacity

    • ECMP and LAG may apply to VPLS traffic

  • RFC4761 and RFC4762 extension to inform peer PE about the presence of flow label on PW

IETF79, Beijing China


Rfc4761 extension
RFC4761 Extension

Use two new bits in Control Flag Bit Vector

0 1 2 3 4 5 6 7

+-+-+-+-+-+-+-+-+

| MBZ |T|R|C|S| (MBZ = MUST Be Zero)

+-+-+-+-+-+-+-+-+

Name C and S remain the same meaning as [RFC4761]

Name T and R are defined in the draft

o When T=1 the PE can send a PW packet with a flow label present. When T=0, the PE sends a PW packet without a flow label.

o When R=1 the PE can receive a PW packet with a flow label

present. When R=0 the PE is unable to receive a PW packet with

the flow label present.

Support Backward Compatibility

IETF79, Beijing China


Rfc4762 extension
RFC4762 Extension

  • Adopt Flow Label Sub-TLV as optional interface parameters to inform the presence of flow label on VPLS PW

    • PE process procedure is identical to the draft

      • Draft-ietf-pwe3-fat-pw-04.txt

    • Support Backward Compatibility

IETF79, Beijing China


Other consideration
Other Consideration

  • MAC learning in VSI is done per a FA-PW association

    • Identical as a PW w/o flow label

  • One VPLS may use a FA-PW b/w a pair of PEs and a PW b/w another pair of PEs

    • Great support for network migration

  • Flow identification is done locally at ingress PE

    • Outside the scope of the draft

IETF79, Beijing China


Acknowledgement
Acknowledgement

  • Thank Adrian Farrel and Mach Chen for the review and valuable suggestions

    Next Step

  • Open for the feedback

  • Suggest to adopt it as WG draft

IETF79, Beijing China


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