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

[Tom Storey]

In my experience when you have the same number of CRC errors as you do Input
errors it generally indicates a duplex mismatch.

Try hard coding speed (where applicable) and duplex at both ends and see
what happens.

Its already been suggested to turn autoneg off, which may also help.

Cheers,
Tom

----- Original Message -----
From: "Drew Weaver" <drew.weaver at thenap.com>
To: <cisco-nsp at puck.nether.net>
Sent: Friday, September 07, 2007 3:41 AM
Subject: [c-nsp] Fiber issue, banging my head.


> 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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