[c-nsp] Packet Loss During the Backbone Network Converge

[Pete Lumbis]

How many routes and tunnels are on the PEs?

Have you modified any of the TE timers from their defaults?

On Thu, Jul 26, 2012 at 9:43 AM, Xu Hu <jstuxuhu0816 at gmail.com> wrote:
> Hi All,
>
> Below is the network topology, i ping from CE-2 to CE-1, during i shutdown
> the PE-4, have some packet drops.
> CE connect to the backbone network using HSRP, the hear beat is through the
> CE switch. PE-1 and PE-3 is the active gateway, PE-2 and PE-4 is the
> standby one.
>
> PE equipment running OSPF as IGP, then on the top having MP-iBGP, MPLS VPN,
> MPLS TE auto-tunnel.
>
> Normally i send traffic from CE-2 to CE-1 will use the path
> "CE-2>PE-3>PE-1>CE-1".  The active tunnel from PE-3 to PE-1 is directly
> path, the backup tunnel is path through PE-4 to PE-2 to PE-1.
> So when i shutdown the router of PE-4, the active tunnel should be no
> impact, but there is some packet drops. Don't understand why.
>
> Firstly, i think it because of the HSRP, then i ping from PE-3 to CE-1
> (Under vrf) when i shutdown PE-4, but the result is also have packet drops.
> So i think is because of backbone network converge. But i am not sure which
> part will need to converge.
>
>    <--CE-1-->
>      |          |
>      |          |
>      |          |
>     PE-1----PE-2
>      |          |
>      |          |
>      |          |
>     PE-3----PE-4
>      |          |
>      |          |
>      |          |
>     <--CE-2-->
>
> Will appreciate for any comments.
>
> Best Regards,
> Hu Xu
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