[c-nsp] Etherchannel guard vs. mstp

[Ross Vandegrift]

On Tue, Mar 10, 2009 at 01:39:45PM +0100, Nemeth Laszlo wrote:
> The first router was the Router A. It changed without problem.
> But when i sent the "spanning-tree mode mstp" to Router B it put down 
> the 4x10G Etherchannel link with Router A and logged it:
> 
> Mar  9 16:04:57.669 MET: %PM-SP-STDBY-4-ERR_DISABLE: channel-misconfig 
> error detected on Te1/3, putting Te1/3 in err-disable state
> Mar  9 16:04:57.677 MET: %PM-SP-STDBY-4-ERR_DISABLE: channel-misconfig 
> error detected on Te1/4, putting Te1/4 in err-disable state
> Mar  9 16:04:57.685 MET: %PM-SP-STDBY-4-ERR_DISABLE: channel-misconfig 
> error detected on Te2/3, putting Te2/3 in err-disable state
> Mar  9 16:04:57.701 MET: %PM-SP-STDBY-4-ERR_DISABLE: channel-misconfig 
> error detected on Te2/4, putting Te2/4 in err-disable state

I'm running ethernetchannel with MSTP and don't have any problems.  Do
you have STP config on the associated member interfaces?  If changing
the STP mode causes problems, I'm guessing you have config left on the
individual interfaces and this causes the STP state machine to change
the state of the member interfaces.

On some platforms (6500, for example), the port bundler freaks out if
you change anything on the member interfaces.  On other platforms
(2960, for example), IOS will simply refuse to apply any changes.

Ross

-- 
Ross Vandegrift
ross at kallisti.us

"If the fight gets hot, the songs get hotter.  If the going gets tough,
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	--Woody Guthrie