From Survivability and Traffic Grooming in WDM Optical Networks
A subgraph-based routing strategy attempts to provide a passive form of redundancy to optical networks in the event of a given set of failure scenarios such as a single link failure or a single node failure. It is passive in that, before a connection is established, it is subjected to the constraints that it can be routed in the network as a fault free of any given set of failures, and is thus guaranteed in the event of a failure from the set. The end user experiences nominal interruption in service due to network state restoration and it is characterized in . The key characteristics of the subgraph-based routing strategy are as follows.
The redundancy in routing is provided using the resources available in the network.
Fault recovery network states are maintained throughout the operation of the network.
Subgraph fault tolerance provides a 100% guarantee for recovery from all possible predefined failure states.
Subgraph routing is a pro-active path-based fault tolerance strategy.
The network state must be altered to accommodate the new topology of the network caused by a failure state.
The first characteristic highlights one of the most important aspects of the strategy; it does not require the allocation of system transmission resources to ensure recoverability after the detection and location of a link failure. Simply put, there is no explicit link capacity lost due to the routing of backup connections because no active backup connections exist in this strategy. The second...
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