Optical Network Segment Recovery
Page 452 7450 ESS MPLS Guide
Optical Network Segment Recovery
The 7x50 may request a particular GMPLS recovery type for a gLSP path segment that spans
the optical network. This refers to the protection afforded to the gLSP path between the UNI-
N nodes. The 7x50 supports the following segment protection types (code points are also
shown):
• Unprotected: 0x00
• Source-Based Reroute (SBR) (Known as Full Rerouting in the IETF): 0x01
• Guaranteed Restoration (GR) (Also known as shared mesh restoration): 0x02
• Sub-network Connection Protection (SNCP) (1+1 bidirectional protection): 0x10
• Path Restoration Combined (PRC): 0x11
These resiliency options are configured under the segment-protection-type command for a
given path.
config
router
gmpls
lsp gmpls-tunnel-name [gmpls-uni]
to remote-uni-c-gmpls-router-id
working-path path-name
[no] segment-protection-type {unprotected | sbr | gr | sncp | prc}
...
[no] shutdown
The default segment-protection-type setting is unprotected.
If the requested protection type cannot be satisfied by the optical network, the 7x50 will
generate a CLI warning and an SNMP trap.
The Table 10 illustrates the recommended combinations of segment protection type and end-
to-end protection type.
Table 10: Combinations of End-to-End and Segment Protection
E2E/Segment Unprotected SBR GR SNCP PRC
Unprotected Yes Yes Yes Yes Yes
Full Rerouting Yes No No Yes No
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