[c-nsp] GSR and 3750 GE-LX link problem

[Joe Shen]

This may caused by GBIC & SPF which has different MTU
set. Have you ever tried to replace one of them?

Joe

 --- Yu-lin Chang <ylchang at seawind.org> µÄÕýÎÄ£º
> 
> Hi,
> 
> I am recently working on a GE link between a GSR and
> a 3750.
> The GSR side is GBIC-LX, the 3750 side is SFP-LX,
> and the fiber
> is single mode. GSR in 32F, and 3750 is placed in
> 28F.
>  
> The GSR config is,
>     interface GigabitEthernet1/0
>      ip address 10.100.251.221 255.255.255.252
>      no ip directed-broadcast
>     end
> 
> The 3750 config is,
>     interface GigabitEthernet1/0/26
>      no switchport
>      ip address 10.100.251.222 255.255.255.252
>     end
> 
> When I plug the fiber, GSR and 3750 can see each
> other
> by using "show cdp neighbor". Also, the MAC
> addresses
> are correctly learned by each other.
> 
> BUT, the problem is they cannot ping each other.
> 
> After many many tried to change negotiation mode and
> made 
> loopback check. There is no problem on the fiber
> itself,
> I am almost been driven to crazy.
> 
> Do you ever have such weird problem?
> 
> 
> Regards,
> Yu-lin
> 
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