[c-nsp] Fiber issue, banging my head.

[Jason LeBlanc]

Try 'no neg' on both sides, I seem to remember an issue related to that 
between 6500 and GSR, but that was six years ago so the memories are a 
little foggy.

Drew Weaver wrote:
> Hi there.
>
> We are trying to connect a Catalyst 6509 connected via fiber to two GSR 12000 routers.
>
> When we connect the switch to the router(s) via G5/1 and G5/2 (on the Supervisor 720) we get input errors on the Router (the GSR side), the line goes up/up but we see:
>
> Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
>  1668 input errors, 1668 CRC, 0 frame, 0 overrun, 0 ignored
>
> The throughput between the two pairs is also terribly slow.
>
> We have tried different cards in the GSRs, we have tried different fiber cables.
>
> The configurations are very simple:
>
> --Pair #1--
> Cat side:
>
> interface GigabitEthernet5/1
>  description Gig-E to GSR #1
>  ip address 192.168.0.34 255.255.255.252
> end
> GSR side:
> interface GigabitEthernet6/0
>  description Gig-E to Catalyst 4
>  ip address 192.168.0.33 255.255.255.252
>  no ip directed-broadcast
>  negotiation auto
> end
>
> --Pair #2-
> Cat side:
> interface GigabitEthernet5/2
>  description Gig-E to GSR #2
>  ip address 192.168.0.106 255.255.255.252
> end
> GSR side:
> interface GigabitEthernet6/0
>  description Gig-E to Catalyst 4
>  ip address 192.168.0.105 255.255.255.252
>  no ip directed-broadcast
>  negotiation auto
> end
>
> we have 3 other catalysts connected to these two GSRs in a similar fashion (exactly the same) and the GSRs do not show errors.
>
> Any idea why the errors would only show on the GSR side?
>
> Thanks for any advice.
>
> -Drew
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