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Extensions to PCEP for Backup Ingress and Egress of LSP. draft-chen-pce-compute-backup-ingress-00 draft-chen-pce-compute-backup-egress-00. Huaimo Chen ( huaimochen @huawei.com ). P2MP LSP Ingress & Egress Local Protection. Multicast Receiver.

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extensions to pcep for backup ingress and egress of lsp

Extensions to PCEP for Backup Ingress and Egress of LSP

draft-chen-pce-compute-backup-ingress-00

draft-chen-pce-compute-backup-egress-00

Huaimo Chen (huaimochen@huawei.com)

79th IETF @ Beijing

p2mp lsp ingress egress local protection
P2MP LSP Ingress & Egress Local Protection

Multicast

Receiver

Existing scenario:double ingress and every egress

Create two global P2MP LSP from each ingress to egresses, carrying data at same time

BFD

P2MP

PE1

Multicast

Source

Data

CE1

CE1

(S,G)Join

PE2

PE5

CE3

Backup Egress Node

CE4

PE6

PE3

Data

CE2

External Source Node

Backup Ingress Node

PE4

External Destination Node

One P2MP LSP for all: Every part locally protected

Big resource saving, Faster failure recovery

P2MP LSP

79th IETF @ Beijing

Backup LSP

overview
Overview
  • Backup Ingress & Egress Capability Advertisement
    • Capability TLV in PCE Discovery
    • Open Message Extension
  • Request and Reply Message Extension
    • RP Object Extension
    • External Source Node Object
    • External Destination Nodes Object

79th IETF @ Beijing

capability tlv in pce discovery
Capability TLV in PCE Discovery

Type (5)

Length (4)

Capability Flags

  • Two flags for backup ingress: one bit for backup ingress of P2MP LSP, another for backup of P2P LSP

bit

11 Backup ingress computation for P2MP LSP

      • Backup ingress computation for P2P LSP
  • Two flags for backup egress

13 Backup egress computation for P2MP LSP

14 Backup egress computation for P2P LSP

79th IETF @ Beijing

open message extension
Open Message Extension
  • A new optional TLV:

Type (8)

Length (4)

  • Two flags for backup ingress: one bit for backup ingress of P2MP LSP, another for backup of P2P LSP

bit

0 Backup ingress computation for P2MP LSP

    • Backup ingress computation for P2P LSP
  • Two flags for backup egress

2 Backup egress computation for P2MP LSP

3 Backup egress computation for P2P LSP

Capability Flags

79th IETF @ Beijing

rp object extension
RP Object Extension
  • RP Object Body:

Flags

I

N

I (backup Ingress) bit is added in flags:

0: Not PCReq/PCRep for backup ingress

1: PCReq/PCRep for backup ingress

I withN:

I=1& N=1: PCReq/PCRep for backup ingress of P2MP LSP

I=1 & N=0: PCReq/PCRep for backup ingress of P2P LSP

Request ID number

Optional TLVs

79th IETF @ Beijing

rp object extension cont
RP Object Extension - cont
  • RP Object Body:

Flags

T

N

T (backup Egress/Tail) bit is added in flags:

0: Not PCReq/PCRep for backup egress

1: PCReq/PCRep for backup egress

T withN:

T=1& N=1: PCReq/PCRep for backup egress of P2MP LSP

T=1 & N=0: PCReq/PCRep for backup egress of P2P LSP

Request ID number

Optional TLVs

79th IETF @ Beijing

external source node esn object
External Source Node (ESN) Object
  • ESN Object Body (object-type 1 for IPv4)

External source node IPv4 address (4 bytes)

  • ESN Object Body (object-type 2 for IPv6)

IPv6 address (16 bytes)

IPv6 address (continued)

IPv6 address (continued)

IPv6 address (continued)

79th IETF @ Beijing

external destination nodes edn object
External Destination Nodes (EDN) Object
  • EDN Object body (object-type 1) for IPv4

Encode of External Destination Nodes (2)

Egress IPv4 address

External Destination IPv4 address

Egress IPv4 address

External Destination IPv4 address

……

Egress IPv4 address

External Destination IPv4 address

79th IETF @ Beijing

next step
Next Step
  • Welcome comments
  • Request to make it into a working group document

79th IETF @ Beijing