[c-nsp] PFR Question

[rizal]

I believe the feature that should match your requirement are

1. To counter IOS deficiency where BGP is not event-driven, use BGP
Selective Address Tracking - introduce in 12.4(4)T, 12.2(33)SRB
http://www.cisco.com/en/US/docs/ios/12_4t/ip_route/configuration/guide/brbadv.html
2. To install backup path for failover allows faster restoration of
connectivity if a primary path is invalid or is withdrawn, use BGP
(Prefix-Independent Convergence) PIC Edge for IP and MPLS-VPN -
introduce in 12.2(33)SRE
http://www.cisco.com/en/US/docs/ios/iproute_bgp/configuration/guide/irg_bgp_mp_pic_ps6922_TSD_Products_Configuration_Guide_Chapter.html

My 2 cents,
/Rizal

On Mar 25, 2:12 am, jack daniels <jckdaniel... 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
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