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

[Jason LeBlanc]

I also remember some bugs back in my GSR days, did you do a bug scrub?  
There were several 'cosmetic bugs' where counters would increment in the 
show commands but there would not actually be any problems.  I already 
deleted your original email, so I can't reference that.  Are there 
actual performance issues or just the counters incrementing?

Drew Weaver wrote:
> Hi,
>
> We're still having issues with this Fiber Gig-e Connection between our Catalyst 6509 and our Cisco 12000GSR.
>
> We have tried 6 different SFPs (all multi-mode)
> We have tried 2 different cables (multimode)
> We have tried two different cards on the Catalyst 6509 (port g5/1 & g6/1 on the Supervisor 720)
> We have tried two different gig-e cards on __two different GSR 12000s__
> We have tried auto-neg, non auto-neg
> We have disabled flow control on the switch side
>
> The problem we're seeing is CRC errors and Input errors on the router side, the sh interface output from the switch side is completely clean.
>
> We have 3 other setups which are virtually identical (same cards, sfps, cables, gbics) and they work fine.
>
> Any ideas would be greatly appreciated, starting to think I'm cursed.
>
> Thanks,
> -Drew
>
> -----Original Message-----
> From: King, Rick [mailto:rick.king at centrepath.com]
> Sent: Friday, September 07, 2007 1:28 PM
> To: Drew Weaver; cisco-nsp at puck.nether.net
> Subject: RE: [Retrieved][c-nsp] Fiber issue, banging my head.
>
> As stated before, check SFP type, and make sure your fiber and SFP types
> match.  You can see a link come up on a MM SFP with SM fiber but link
> will not work properly.
>
> Also verify that you are not overpowering your SFPs (i.e. your optical
> power levels are in spec with the cards RX specs)
>
> Hard code speed
>
> Unless you have a transport system between the 2 devcies, SFPs should
> match (i.e. SM or MM on both sides)....
>
> -----Original Message-----
> From: Drew Weaver [mailto:drew.weaver at thenap.com]
> Sent: Thursday, September 06, 2007 2:11 PM
> To: cisco-nsp at puck.nether.net
> Subject: [Retrieved][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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