secondary-priority srlg-disjoint

Use this command to set how to avoid the SRLGs (Shared Risk Link Groups) of a protected primary.

A fast-reroute/secondary path for an LSP that is disjoint from the primary ensures that a single point of failure on a particular link does not bring down both the primary and secondary paths in the LSP.

The SRLG option configured in RSVP-TRUNK mode (this command) takes higher preference than the option configured in RSVP router mode (see the srlg-disjoint command).

Use the no form of this command to not avoid the SRLGs of a protected interface.

Command Syntax

secondary-priority <1-5> srlg-disjoint (forced|preferred)
no secondary-priority <1-5> srlg-disjoint

Parameters

forced

The router does not create the secondary/backup tunnel unless it avoids SRLGs of the primary-path/protected-interface.

preferred

With two explicit paths, the first explicit path tries to avoid the SRLGs of the primary-path/ protected interface. If that does not work, the secondary/backup tunnel uses the second path (which ignores SRLGs).

Command Mode

RSVP -TRUNK mode

Example

#configure terminal 
(config)#rsvp-trunk t1
(config-rsvp)# secondary-piority 1 srlg-disjoint forced