[c-nsp] PFR Question

[jack daniels]

dear guys,

is my mail being delivered to group as no one replied.

On Wed, Mar 24, 2010 at 11:42 PM, jack daniels <jckdaniels12 at gmail.com>wrote:

> Hi Network champs,
>
> I'm stuck in understanding of PFR . Docs say it converges in 3 sec ( for
> realtime traffic VOICE )...
>
> I understand you can send traffic out secondry link but what about traffic
> which has to come back from remote end ( for which SP has not converged).
>
> But if you have --
>
>
>
> |CE1--------PE1
> PE3--------CE3
>  X.X.X.X---------|                 --------------------MPLS
> DOMAIN-------------------
>                      |  CE2--------PE2
> PE4--------CE4
>
>
> Now my primary link is CE1-PE1 and secondary is CE2-PE2
> If my CE1-PE1 goes down i route traffic via CE2-PE2<<<<<<I understand this
> ok...
>
>
> BUT MY QUESTION IS -
>
> PE3 and PE4 ( for this VRF) still has NOW converged the BGP and still for
> it next hop for X.X.X.X is PE1. So how fwd can happen in 3 sec untill
> Service providers all routers dont converge and understand that CE1-PE1 link
> is down.
>
>
> Regards
>
>