Proactive Connection Verification, Continuity Check and Remote Defect indication for MPLS Transport Profile

draft-ietf-mpls-tp-cc-cv-rdi-02

editors:Dave Allan, John Drake, George Swallow

Changes Since the Last Version

• Comment resolution– Primarily clarification and editorial

• Major changes– Interleaving of CC and CV– Relocation of source MEP information– Clarifications on the startup procedures

• Minor changes– IP encapsulation added for backwards compatibility– RDI clarified as being a diagnostic code– Poll/Final clarified as not valid operation for GAL/G-

ACh encapsulated BFD

Interleaving of CC and CV

• Objective is to reduce sink MEP processing load while still offering mis-connectivity detection

• A source MEP can send CV source MEP information every ‘n’ CC messages– Note CV counts as a CC for LOC defect detection

• Discussion point is defect exit criteria– Either LSP “locks” in down state on detecting mis-

connectivity OR there is a minimum insertion interval for CV

CC CC CC CV CC

Relocation of Source MEP Information

• No longer uses ACh TLV• ACh channel type identifies if source MEP TLV trails the BFD control

packet

0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+|0 0 0 1|Version| Flags | 0xHH BFD CV Code Point |+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+| |~ BFD Control Packet ~| |+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+| |~ Unique MEP-ID of source of the BFD packet ~| |+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Clarification on Startup

• For DOWN and INIT states, tx rate is 1/sec and detection time is 3.5 seconds

• On transition to UP tx rate switches to configured/negotiated rate and detection time is “detect mult x tx interval”

Next Steps

• Continue to gather feedback from the list• May need to progress draft without

addressing uni-directional paths– Document in a “bis” version