[c-nsp] err-disable state on a cisco 3750 catalyst

Nick Cutting ncutting at edgetg.com
Tue Jul 12 16:25:44 EDT 2016

We have similar command on the Brocade side, not the cisco side and have had no issues:

interface Port-channel 3
 description L2 Transit to Cisco-Kit
 no ip address
 portmode hybrid
 no spanning-tree pvst err-dis cause invalid-pvst-bpdu 
 no shutdown

-----Original Message-----
From: cisco-nsp [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Hunter Fuller
Sent: Tuesday, July 12, 2016 4:13 PM
To: Gert Doering <gert at greenie.muc.de>
Cc: cisco-nsp <cisco-nsp at puck.nether.net>
Subject: Re: [c-nsp] err-disable state on a cisco 3750 catalyst

Yes, I was very surprised. We are rolling out some Brocade ICX 7k units. If you LACP one of those to a Cisco, this will happen. I have observed it with ICX 7750 and 7450, as well as Catalyst 3850 and 6700.

On Tuesday, July 12, 2016, Gert Doering <gert at greenie.muc.de> wrote:

> Hi,
> On Tue, Jul 12, 2016 at 02:26:36PM -0500, Hunter Fuller wrote:
> > If you are running a LACP bundle, and the other end is not a Cisco 
> > piece of gear, and the error only happens when more than one link is 
> > up, then what is happening is, the far end is sending BPDUs on more 
> > than one member of the LACP bundle. Cisco gear does not expect this 
> > and will shut the entire Port-channel. To make it stop doing that, 
> > do this in config mode:
> >
> > no spanning-tree etherchannel guard misconfig
> It will log *this* error message in this scenario?
> This strikes me as odd (usually Cisco gear is pretty good in 
> explaining why it is disabling stuff, people just never read further than "ERROR...").
> gert
> --
> USENET is *not* the non-clickable part of WWW!
>                                                            // 
> www.muc.de/~gert/ Gert Doering - Munich, Germany gert at greenie.muc.de 
> <javascript:;>
> fax: +49-89-35655025
> gert at net.informatik.tu-muenchen.de <javascript:;>


Hunter Fuller
Network Engineer
VBRH Annex B-1
+1 256 824 5331

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