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Question on Segment Routing Shared Fate Groups

  • 1.  Question on Segment Routing Shared Fate Groups

     
    Posted 08-28-2023 06:56

    Hi.

    I have a topology in which R2 is configured with two of its point-to-point links configured to be in a single Shared Fate Group.  I do not see any of this information in L2's ISIS LSP. Then how do the other routers learn of R2's Shared Fate Group in order to avoid its links in their backup Segment Routed LSPs? Thanks.

    R2 CONFIGURATION:

    routing-options {
        fate-sharing {
            group FG1 {                     
                cost 100;
                use-for-post-convergence-lfa;
                from {
                    172.16.1.4 to 172.16.1.5;
                    172.16.1.6 to 172.16.1.7;
                }
            }
        }

    }

    protocols {
        isis {
            backup-spf-options {
                use-post-convergence-lfa maximum-labels 5;
            }
            source-packet-routing {
                srgb start-label 100000 index-range 1000;
                node-segment ipv4-index 2;
            }
            level 1 disable;
            interface ge-0/0/1.0 {
                point-to-point;
                level 2 {
                    post-convergence-lfa fate-sharing-protection;
                }
            }
            interface ge-0/0/2.0 {
                point-to-point;
                level 2 {
                    post-convergence-lfa fate-sharing-protection;
                }
            }
            interface all {
                level 2 {
                    post-convergence-lfa;
                }
            }                               
            interface fxp0.0 {
                disable;
            }
        }

    }