[j-nsp] Fate sharing between BGP and RSVP

[kworm83 at gmail.com]

If you make your LSP with a strict path where it will not use the other IGP path then you can use a forwarding table export policy to force the LSP as a strict next next hop:

policy-statement name-of-policy {
   term term-1 {
       from <your match condition here>;
       then {
           install-nexthop strict lsp YOUR-LSP-NAME;
           accept;
       }
   }
}


If the LSP fails the BGP route will disappear.  I have tested this in the lab but not at full table scale.

Kevin


> On Sep 13, 2016, at 6:26 PM, Rob Foehl <rwf at loonybin.net> wrote:
> 
> On Tue, 13 Sep 2016, Chuck Anderson wrote:
> 
>> I guess I don't understand what you are trying to accomplish then.
>> Ttaffic engineering specific routes is exactly what RSVP is used for.
>> The MPLS path should be torn down if there is no available
>> RSVP-capable route.  Did you try just not configuring RSVP on the
>> interfaces that can't support MPLS?
> 
> The LSP is torn down; the BGP session carrying a bunch of routes for which that LSP is the only viable forwarding path survives.  (RSVP is only configured where it ought to be, no "interfaces all" or anything like that.)
> 
> The goal is for the BGP-learned routes to disappear along with the LSP -- preferably by just tearing the session down with it, but otherwise invalidating the next-hops would suffice.
> 
> I have another idea in my back pocket if this isn't workable, but that involves turning a bunch of P routers into full BGP RRs...
> 
> -Rob
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