MPLS-TP Maintenance Identifiers
Page 72 7450 ESS MPLS Guide
Figure 18: BFD used for proactive CV on MPLS-TP LSP
Linear protection switching of LSPs (see below) is triggered based on a CC or CV defect detected
by BFD CC/CV.
Note that RFC6428 defines two BFD session modes: Coordinated mode, in which the session state
on both directions of the LSP is coordinated and constructed from a single, bidirectional BFD
session, and independent mode, in which two independent sessions are bound together at a MEP.
Coordinated mode is supported.
BFD is supported on MPLS-TP LSPs. When BFD_CV detects a mis-connectivity on an LSP, the
system will drop all incoming non-OAM traffic with the LSP label (at the LSP termination point)
instead of forwarding it to the associated SAP or PW segment.
The following GACh channel types are supported for the combined CC/CV mode:
• 0x22 for BFD CC with no IP encapsulation
• 0x23 for BFD CV
The following G-ACh channel types are used for the CC-only mode:
•0x07
al_0232
LSP1
LSP2
Mis-connection
(Mis-swap)
BFD Packet Injected Into LSP 2
0(3,'[
BFD Packet Received on LSP 1
0(3,'[
LER A LSR A LSR B LER B
LSR B LER C
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