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

[Michael K. Smith]

On 1/11/05 1:21 PM, "Gert Doering" <gert at greenie.muc.de> wrote:

> Hi,
> 
> On Tue, Jan 11, 2005 at 01:04:11PM -0800, Michael K. Smith wrote:
>>> 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.
> [..]
>>> BUT, the problem is they cannot ping each other.
>> 
>> Have you actually turned on routing from the global config?  I.e "ip
>> routing"?
> 
> For local ping, this isn't necessary - the routers won't forward packets
> if "no ip routing" is set, but that's not necessary to ping.
> 

Are you sure?  I'm not sure how the 3750 deals with encapsulation without
the underlying protocols enabled.  Does the ethernet interface encapsulate
the traffic as a Layer 3 packet or a Layer 2 frame?  Is the encapsulation
based solely upon the "no ip switchport" command on the 3750?

Mike