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

[Mark Tinka]

On 10/Jul/18 23:33, adamv0...@netconsultings.com wrote:

> Now a robust transport network with appropriate redundancy and failover 
> mechanisms is responsibility of each operator.
> One can use IGP tuning or take the new path computation out of the equation 
> completely with FRR options: LDP + FRR based on LFA or even rLFA (with 
> targeted LDP sessions all over the place) or SR with ti-LFA or RSVP-TE FRR. 
> With FRR there's really no need to tune IGP for fast SPF path computation 
> -but there might still be need to tune it for fast LSA/LSP propagation (think 
> BGP-PIC "core"). 
> With FRR it then all boils down to how fast can link failures be detected 
> -loss of light will always be the fastest method, but the good practice is to 
> use some sort of keepalives as well (BFD/CFM/IGP-keepalives). 
> Then the faster the link down and up detection the faster the link can flap 
> -that's where one should use dampening features (IP event dampening, bfd 
> damping or hold-down timers -for getting interface up ) to protect your IGP 
> (or BGP dampening for nexus users -since nexus platform doesn't have any 
> other dampening (exception is/was 3548)). 

Agreed.

What we do is IS-IS + BFD (for IS-IS only) + (r)LFA.

Mark.
_______________________________________________
juniper-nsp mailing list juniper-nsp@puck.nether.net
https://puck.nether.net/mailman/listinfo/juniper-nsp