1. Furthermore, nodes traversed by a backup path are not shown. 2. The scheme derives backup paths for every spanning path in the multicast tree. 3. Here the backup path is calculated together with the primary at provisioning time. 4. Note that complete network is not shown only primary and backup paths are shown. 5. The second approach is to have a predefined backup path computed before the failure. 6. In path protection, a backup path is used from the source to its destination to bypass the failure. 7. There are two types of path protection in Optical Mesh Networks : Dedicated Backup Path Protection and Shared Backup Path Protection 8. There are two types of path protection in Optical Mesh Networks : Dedicated Backup Path Protection and Shared Backup Path Protection 9. In one-to-one backup approach, the PLRs maintain separate backup paths for each LSP passing through a facility. 10. The backup path terminates by merging back with the primary path at a node called the " Merge Point " ( MP ).
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