Alcatel-Lucent 7450 - End to End Recovery (GMPLS Layer); Figure 42: End-To-End Load Sharing GMPLS Tunnel Group with Glsp Path Diversity; Unprotected Glsp

GMPLS
7450 ESS MPLS Guide Page 431
Figure 42: End-to-End Load Sharing GMPLS Tunnel Group with gLSP Path Diversity
End to End Recovery (GMPLS Layer)
Unprotected gLSP
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.
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
24857
Path, PathErr
Tunnel
group
IP
Tunnel
group
IP