This protection scheme is similar in a sense to Ring-based path protection and Dedicated Backup Path Protection ( DBPP ) schemes described before.
12.
A connection can be protected against a single failure by defining a backup path, diverse from the primary path taken by the connection over the mesh network.
13.
Also if at another time failure of SRLG2 is detected, it is reported to RAPID and the traffic through link 2 and 3 are each re-routed through a new backup path.
14.
An advantage to using PWs as the underlying technology for the data plane is that in the event of failure, traffic will automatically be routed along available backup paths in the service provider's network.
15.
The backup path and associated resources can be dedicated to the connection ( Dedicated Backup Path Protection, aka dedicated ( 1 + 1 ) path protection, Subnetwork Connection Protection ( SNCP ) in Pacific oceans ).
16.
The backup path and associated resources can be dedicated to the connection ( Dedicated Backup Path Protection, aka dedicated ( 1 + 1 ) path protection, Subnetwork Connection Protection ( SNCP ) in Pacific oceans ).
17.
Under normal operations, assuming no failure on the network, the traffic is carried on the primary paths only; the shared backup path is only used when there is a failure in one of those primary paths.
18.
Even though the backup path is calculated, it is not assigned to a specific circuit before a failure occurs; cross connect requests are initiated after the fact on a first-come, first-served basis.
19.
Maintaining state information for backup paths protecting individual LSPs, as in the one-to-one approach, is a significant resource burden for the PLR . Moreover, periodic refresh messages sent by the PLR, in order to maintain each backup path, may become a network bottleneck.
20.
Maintaining state information for backup paths protecting individual LSPs, as in the one-to-one approach, is a significant resource burden for the PLR . Moreover, periodic refresh messages sent by the PLR, in order to maintain each backup path, may become a network bottleneck.
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