End to End Recovery (GMPLS Layer)
Page 434 7450 ESS MPLS Guide
Figure 45: Optical Segment Protection Domain
The following segment protection types are supported:
• Unprotected — The path is not protected against failure.
• Source-Based Reroute (SBR) — In this mechanism (also known as Full Rerouting), a path
is restored after a failure, but the success of restoration depends on the available resources.
This can reroute traffic in 200 ms or more.
• Guaranteed Restoration (GR) — A shared backup is assigned to the path, and recovery
resources are reserved. If they cannot be reserved on a shared path, then this falls back to
SBR. This can reroute traffic in 50 ms or less. This mechanism is also known as 1+shared
standby. This is also known as Rerouting without extra traffic, or shared mesh restoration.
• Sub-network Connection Protection (SNCP) — This provides 50 ms protection in the case
of a single failure. This is also known as 1+1 bidirectional path protection.
• Path Restoration Combined (PRC) — This provides 50 ms protection, even in the case of
multiple failures. This is also known as SNCP with SBR.
SR/XRS
UNI-C UNI-N
UNI-C
SRLG
SR/XRS
UNI-CUNI-N
UNI-N UNI-C
OTN/photonic
switches
SRLG
Diverse
UNI-N
24860
Path, PathErr
Segment protection type
Resv, ResvErr
tunnel
group
IP
tunnel
group
IP
Optical Segment (UNI-N to UNI-N)
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