The isis srlg command adds an interface to a shared risk link group (SRLG).
The undo isis srlg command deletes an interface from an SRLG.
By default, an interface is not added to any SRLG.
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Usage Scenario
An SRLG is a set of links that share a common physical resource, such as an optical fiber. These links share the same risk level. If one of the links fails, all the other links in the SRLG may also fail.
If two links have the same risk of failure, you can run the isis srlg command on each of the links' interfaces to add the links to the same SRLG. Then, configure IS-IS to preferentially select a backup link not in the same SRLG as the specified link during route calculation in Auto FRR, reducing the possibility of network traffic interruption.Prerequisites
IS-IS has been enabled on the interface using the isis enable command in the interface view.
Follow-up Procedure
Run the tiebreaker srlg-disjoint preference command to configure IS-IS to preferentially select a backup link not in the same SRLG during route calculation in Auto FRR.