End To End Recovery (Gmpls Layer); Unprotected Glsp; Figure 42: End-To-End Load Sharing Gmpls Tunnel Group With Glsp Path Diversity - Alcatel-Lucent 7450 Manual

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End to End Recovery (GMPLS Layer)

The default level of E2E recovery is unprotected. In this case, a gLSP can only recover from a

failure when the downstream resource that failed is recovered. The following figure illustrates

this. When a gLSP fails in the optical network, a failure notification is propagated to the source

UNI-C node e.g. using a PathErr or a NotifyErr LSP Failure message. The source UNI-C node

takes no action, but will continue to refresh the PATH message for this gLSP, which may be

rerouted around the failure by the optical network e.g. if the IGP in the optical network

reconverges. The gLSP is treated as operationally down until a message indicating that the gLSP

has been restored is received by the 7x50; for example, a Notify Error LSP Restored.

7450 ESS MPLS Guide

Path, PathErr

OTN/photonic