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

[Michael K. Smith]

On 1/11/05 1:29 AM, "Yu-lin Chang" <ylchang at seawind.org> wrote:

> 
> 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?
> 
> 

Have you actually turned on routing from the global config?  I.e "ip
routing"?

Mike