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Support C- Bidir with Ingress Replication draft-ietf-l3vpn-mvpn-bidir-ingress-replication Jeffrey Zhang Yakov Rekhter Andrew Dolganow 89 th IETF, London. Summary. Presented in 87 th IETF, Berlin Accepted as WG Item recently Inter-area P-tunnel Segmentation was out of scope

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Support C-Bidir withIngress Replicationdraft-ietf-l3vpn-mvpn-bidir-ingress-replicationJeffrey ZhangYakov Rekhter Andrew Dolganow89th IETF, London

summary
Summary
  • Presented in 87th IETF, Berlin
  • Accepted as WG Item recently
  • Inter-area P-tunnel Segmentation was out of scope
    • Now we’ve figured out how to support it
  • Present the inter-area segmentation support
    • Assuming that the audience is familiar with the base technology
    • Seek WG feedback/consensus before updating the draft
simulating partial mesh of mp2mp p tunnels with ir
Simulating “Partial Mesh of MP2MP P-tunnels” with IR
  • Each partition has its own MP2MP P-tunnel simulated with IR
    • A partition is the set of PEs selecting the same UMH wrt a C-RPA
  • One S-PMSI A-D route from the UMH wrt a C-RPA
    • Identifying the MP2MP tunnel
    • PTA specifies IR, with a label for other PEs to send traffic to the UMH
  • One Leaf A-D route responded from each PE in the same partition/tunnel
    • Imported by all PEs: Not just by the S-PMSI originator
      • Even those not in the same partition; but those will just ignore the route
    • PTA includes a label corresponding to the UMH
      • For other PEs to send traffic to the Leaf A-D route’s originator
inter area segmentation regular ir for c unidir
Inter-area segmentation: Regular IR for C-unidir
  • Ingress PEs replicate to local PEs and ABRs
  • ABRs replicate to downstream PEs/ABRs via label switching
  • ABRs reflect S-PMSI AD routes with S-NH-EC
  • Leaf AD routes sent to upstream ABRs
    • Follow the S-NH-EC in S-PMSI AD routes
  • ABRs reflect Leaf-AD routes further upstream, with updated RT pointing to the upstream

PE1

Area1

Area2

Area3

ABR

Traffic & S-PMSI AD

Leaf AD

inter area segmentation ir for c bidir 1 2
Inter-area segmentation: IR for C-bidir 1/2
  • Per-area partitions
    • Ingress area (wrt C-RPA): PEs/ABRs picking the same UMH
    • Downstream area: PEs/ABRs that pick the same active S-PMSI AD route
  • Leaf AD routes are imported by all PEs/ABRs in an area
    • Even those not in the same partition
  • Only the ABR in the same partition reflects the Leaf AD routes upstream
    • It re-advertised the corresponding S-PMSI AD routes downstream

PE1

Area1

X

ABR1

ABR2

Area2

Partition 1 Partition 2

Leaf AD

inter area segmentation ir for c bidir 2 2
Inter-area segmentation: IR for C-bidir 2/2
  • ABRs label switch bidirectional traffic, requiring split-horizon
    • ABR label switches traffic from PE4 to PE1/2/5/6
      • But not to PE3
    • ABR label switches traffic from PE1 to PE3/4/5/6
      • But not to PE2
  • When ABRs re-advertise S-PMSI AD routes to different downstream areas, different labels must be used
    • So that it can install different label switching routes to switch traffic accordingly

PE1

PE2

x

Area 1

Area 2

ABR

x

PE3

PE6

Area 3

PE4

PE5

Traffic from PE1

Traffic from PE4

slide7
Plan
  • Seek comments
  • Update draft with inter-area segmentation support
    • Per-area partitions
    • Only the ABR in the same partition reflects Leaf AD routes upstream
    • ABRs advertise different labels when re-advertising S-PMSI AD routes to different downstream areas
  • BTW –
  • Please review & comment draft-rosen-l3vpn-mvpn-ir as well
    • Ingress Replication Tunnels in Multicast VPN
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