[j-nsp] Segment Routing Real World Deployment (was: VPC mc-lag)

[Saku Ytti]

Hey Alexandre,


> When we use l2circuits, you remove some layer of routing protocol troubleshooting. In just few command you know what’s going on.
> In a flap, BGP session will be dropped after timers reached.
>
> RSVP/ISIS/LDP will be affect immediately.  Also ISIS is the fundamental key of everything over here....
> With BGP, you have to check everything twice, including filters everywhere if someone change this or change that.

All these protocols have hello timers, LDP, ISIS, RSVP, BGP. And each
of them you'd like to configure to trigger from events without delay
when possible, instead of relying on timers. Indeed you can have BGP
next-hop invalidated the moment IGP informs it, allowing rapid
convergence.

-- 
  ++ytti