[c-nsp] mpls-te - dynamic latency?

[christian.macnevin at uk.bnpparibas.com]

Well, we'll be migrating from eigrp, not ospf, so yes, we do need is-is :)

And as far as ds-te goes, I guess I need to understand that feature a 
little better to comment whether I feel I need
it just yet, But the end goal (whether it's that feature or not) is that 
we'd the tunnel to be as visible to the routing
protocol as poss (autoroute i guess) and be routing traffic into those 
tunnels based on dscp markings. If I can
avoid 'invisible' mechanisms like pbr, than I will.

Also, it's not just a matter of making sure the low latency path is 
chosen, but that non-latency-dependent traffic
will use the other link.

As for using the affinity bits, cheers, I'll look more into that.

Thanks,
Christian.





Internet
oboehmer at cisco.com

04/04/2006 17:46

To
Christian MACNEVIN, cisco-nsp
cc

Subject
RE: [c-nsp] mpls-te - dynamic latency?






christian.macnevin at uk.bnpparibas.com <> wrote on Tuesday, April 04, 2006
5:16 PM:

> Hi folks,
> 
> We're just looking into mpls-te to ensure low latency paths are taken
> by the relevant traffic in our network,
> We have an mpls core (sorry, I always have to make this disclaimer,
> 99% of people don't believe that any
> financial would ever see the point) and will most likely be
> transitioning to is-is to make it happen.
> 
> Has anyone had any experience with doing this? I'm looking to use
> DS-TE and I'd really prefer to keep the
> tunnel building dynamic and avoid building hundreds of explicit
> tunnels. 
> I'm guessing this might require weighting path selection for low and
high 
> latency paths based on igp tagging.

suggesting some TE design is difficult without knowing the topology, but
I'd look at affinity/attribute flags (mpls traffic-eng attribute-flags
xxxx) and then use appropriate "tunnel mpls traffic-eng affinity" on the
tunnel to tell CSPF to dynamically find a path crossing only the
"colored" links. Then you can use PBR to direct your voice traffic
towards the tunnel.

I don't think you need ISIS for this to work, OSPF should work just as
well.

Not sure if you need DS-TE for this job..

                 oli



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