GMPLS
7450 ESS MPLS Guide Page 433
Figure 44: Full LSP Rerouting
Optical Segment Recovery
Optical segment protection refers to the ability of the optical network to protect the span of a gLSP
between ingress and egress UNI-N nodes. It does not require any protection switching on the UNI-
C nodes. However, it does require the UNI-C to signal a request for a particular segment
protection type towards the UNI-N in the PATH message for a gLSP. The optical network may
either accept this request, reject it or respond with an alternative. Segment protection is defined in
RFC 4873.
SR/XRS
UNI-C UNI-N
SRLG
SR/XRS
UNI-CUNI-N
UNI-N UNI-C
OTN/photonic
switches
SRLG
Diverse
UNI-N
24859
Path, PathErr
Notify, NotifyErr
IP
UNI-C
IP
Alternate
Working (primary)
Path Resv
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