mpls->path->adaptive knob use case

[pad]

Configuring primary or secondary path of an LSP with the adaptive knob does not prevent double counting. Under what circumstances would an user excercise this option?

[Caillin]

The adaptive knob on an LSP will define that in the event of a path change (caused by cspf recomputation or constraint change etc), the LSP will always use RSVP to set up the new LSP path before tearing down the old path. (eg if the new path cannot be setup then the old path will not be torn down is my understanding)

Cheers,

Caillin

[pad]

I was referring to the adaptive config as in

        label-switched-path g2140_bulgari_2 {
            to 10.255.64.40;
            install 1.7.2.2/32 active;
            inactive: bandwidth 500m;
            priority 3 3;
            primary pri_1 {
                bandwidth 300;
                adaptive;
            }
            secondary sec1 {
                bandwidth 250;
                adaptive;
                standby;
            }
        }

I think this will let oversubscribing the paths across multiple LSPs.

[Caillin]

I believe adaptive will also place the LSP into Shared-Explicit (SE) mode rather than Fixed-Filter (FF) which means the the bandwidth reservation will only be made once on any shared links.  You should be able to see the mode of your LSP using show mpls lsp IIRC.

[wimclend]

I think you need to configure adaptive under the LSP definition itself, not the Path settings

wimclend

[SapphireNET]

Caillin

This functionality you have decribed is achieved with the standby keyword.