Since this approach can only protect from a single failure at a time, if a second primary path fails and at least a portion of its backup path is already in used, this path won't be able to recover unless restoration technique is in place for such cases.
22.
This node which redirects the traffic onto the preset backup path is called the "'Point of Local Repair ( PLR ) "', and the node where a backup LSP merges with the primary LSP is called "'Merge Point ( MP ) " '.
23.
In DBPP, both the primary and backup path carry the traffic end to end, then it is up to the receiver to decide which of the two incoming traffic it is going to pick; this is exactly the same concept as in provisioned capacity for the primary because the backup path is usually longer due to the link and / or node diversity rule of thumb.
24.
In DBPP, both the primary and backup path carry the traffic end to end, then it is up to the receiver to decide which of the two incoming traffic it is going to pick; this is exactly the same concept as in provisioned capacity for the primary because the backup path is usually longer due to the link and / or node diversity rule of thumb.
25.
The "'p-Cycle protection "'scheme is a technique to protect a mesh network from a failure of a link, with the benefits of ring like recovery speed and mesh-like capacity efficiency, similar to that of a shared backup path protection ( SBPP ) . p-Cycle protection was discovered in late 1990s, with research and development done mostly by Wayne D . Grover, and D . Stamatelakis.
26.
But given a failure in SRLG2, the DS-3 traffic on link 3 would be restored by FASTAR via a newly re-computed backup path while the DS-3 traffic on link 2 would not be restored as FASTAR is not implemented in either office B or C . To restore all three links in the event of failure of both SRLGs, FASTAR is implemented in offices A and C . A failure in SRLG1 would cause FASTAR to automatically re-route each of the traffic on link 1 and 3 via two re-computed backup paths.
27.
But given a failure in SRLG2, the DS-3 traffic on link 3 would be restored by FASTAR via a newly re-computed backup path while the DS-3 traffic on link 2 would not be restored as FASTAR is not implemented in either office B or C . To restore all three links in the event of failure of both SRLGs, FASTAR is implemented in offices A and C . A failure in SRLG1 would cause FASTAR to automatically re-route each of the traffic on link 1 and 3 via two re-computed backup paths.
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