[c-nsp] Cisco 3750 Stack less disruptive EtherChannel configuration

Alexander Clouter alex at digriz.org.uk
Tue Oct 6 08:56:05 EDT 2009

luismi <asturluismi at gmail.com> wrote:
> We had a problem with a stack 3750 here and the configuration is..
> Stack (2x3750) === FEC === SW 2960
> It is a cross etherchannel configuration.
> 3750 is not working with L3 mode at all.
> The FEC config is "mode on".
We use 'active' as then it is using LACP and testing not just that the 
link is up but it is also successfully shifting packets over it; plus 
some other goodies.

> So, one the 3750 had a problem yesterday and it creates disruption in
> the connectivity with the 2960 switches. I didn't expect from
> Etherchannel. It is supossed that is pretty fast but it was not.
> I would like to see if there is anyone here with a similar configuration
> or other one to fix this situation.
> Any comment is welcome
Depends what the disruption was, as you are all L2, if it was the VLAN 
instance that was affected then that would be your longer than expected 
outage.  The Etherchannel will only protect you from link failures on 
the Etherchannel, not from what might be happening inside that 


Alexander Clouter
.sigmonster says: Oh, I get it!!  "The BEACH goes on", huh, SONNY??

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