A path reroute mechanism for use in communication networks comprising multiple
searches for a routing path to restore traffic following a failure that could not
be protected by a previously established protection route (i.e. protection tunnel,
bypass, etc.) or for routing or rerouting of traffic paths for optimization or
any other purpose. Each node advertises TLVs that include bandwidth allocation
information used to derive the actual amount of bandwidth available for protection
purposes, protected paths and unprotected paths or a portion of this information
such as in the case where unprotected paths are not supported. Searches are performed
on larger and larger portions of the available bandwidth until a route for the
path is found.
