From: Paul Cosgrove (paul.cosgrove@heanet.ie)
Date: Mon Apr 21 2008 - 06:35:27 ART
Hi Salau,
What model router and cards are you using? Some modules (e.g. on a
3800) do not support independent clocking mode, and instead use the
clock signal from port 0 for all interfaces installed in the module. If
the signal on Port 0 is unreliable, it will affect all the other
circuits. You can configure another port as the source or configure a
failover sequence using network-clock-participate.
Have also seen bugs related to unicast RPF which can take multiple
interfaces down. Sometimes removing uRPF is enough to restore
connectivity, but you may need to reload.
Keep in mind that first level support on SP helpdesks are not always
aware of how to fully check a circuit. No alarms on the monitoring
system means no problems, right? Push a little harder and you might get
a different answer back when the problem is escalated and the
termination equipment checked.
Paul.
Salau, Yemi wrote:
> Hello Guys,
>
> I have an issue that I think is worth discussing, might be down to
> hardware or software bug afterall, but I want to be absolutely sure one
> of this is the case.
>
> I have a Frame-Relay hub Router connecting to so many other Routers via
> main interfaces and subinterfaces of a particular main interface. But I
> discovered when one of the circuits on the main interface goes down, it
> brings down all the other circuits with it.
>
> Having checked with the FR Service provider, they said it couldn't be on
> their side, so I'm thinking is there any possible reason why such thing
> could happen, taking the SP service out of the equation.
>
> Many Thanks
>
> Yemi Salau
>
>
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