From: Mounir Mohamed (mounir.mohamed@gmail.com)
Date: Sun Jul 29 2007 - 18:20:06 ART
I beleive the interfaces going to err-disable mode when there is only one
side configured by channel-group X mode on, due to STP issue, when you
enable ether-channel all Ether-channel members sending traffic which casued
in the err-disable.
On 7/30/07, Jonny English <redkidneybeans@gmail.com> wrote:
>
> Etherchannel in on mode will cause the link to go into err-disable.
>
> Like if you have two sides of an etherchannel in on mode and you reload
> switch A, switch B's etherchannel ports that are in on mode will go into
> err-disable.
>
> This doesn't happen with the other modes.
>
> Correct me if I am wrong, but i had this issue when i did an after hours
> change from work.
>
>
> On 7/29/07, Djerk Geurts <djerk@djerk.nl> wrote:
> >
> > I have a 3750 and a 355 and when bringing up an etherchannel I get the
> > following on the 3550:
> >
> > 1d21h: %PM-4-ERR_DISABLE: channel-misconfig error detected on Fa0/23,
> > putting Fa0/23 in err-disable state
> >
> > Same config between a 3550 and 3750 is fine. 3548 - 3750 is fine as well
> > as
> > is 3548 - 3550. Actually all options between all 4 switches work but
> this
> > one.
> >
> > Port and eth-chan config:
> >
> > interface FastEthernet0/22
> > description *** C3750-ME F1/0/22 ***
> > switchport trunk encapsulation isl
> > switchport mode trunk
> > channel-group 5 mode on
> > End
> >
> > interface Port-channel5
> > description *** C3750 Po5 ***
> > switchport trunk encapsulation isl
> > switchport mode trunk
> > end
> >
> > Switchport mode has no influence, port-security is off on both sides.
> What
> > is casusing this and how can I troubleshoot this? A debug etherchannel
> > doesn't display anything related at all, other than the message listed
> > above.
> >
> > So far I've seen it happen when one side is configured for etherchannel
> > and
> > the other side isn't but a shut no-shut helps things along nicely once
> > both
> > sides are configured for etherchannel propperly. But this time it
> > doesn't...
> >
> > Any help appreciated.
> >
> > Regards,
> >
> > --
> > Djerk Geurts | Senior R&D Engineer | Easynet
> > T +31 (0)20 798 98 84 | F +31 (0)20 798 98 99 | www.easynet.com
> > Karspeldreef 14 | 1101 CK Amsterdam | The Netherlands
> > mailto:djerk.geurts@nl.easynet.net
> >
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> >
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-- Best Reagrds, Mounir Mohamed
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