Figure 45: Optical Segment Protection Domain - Alcatel-Lucent 7450 Manual

Ethernet service switch

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Table of Contents

End to End Recovery (GMPLS Layer)

Segment protection type

The following segment protection types are supported:

Optical Segment (UNI-N to UNI-N)

Path, PathErr

Resv, ResvErr

OTN/photonic

Figure 45: Optical Segment Protection Domain

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.

7450 ESS MPLS Guide