RE: STP issue

:)

Hi Gary, loopguard won't solve the issue. For loopguard to work the port has
to be a non designated port. All my 6500 ports are designated because it's the
Root bridge and i have no issues with receiving BPDUs

"The loop guard feature makes additional checks. If BPDUs are not
         received on a non-designated port, and loop guard is enabled, that port is
         moved into the STP loop-inconsistent blocking state, instead of the
listening /
         learning / forwarding state"

thx,
Hadi

> From: gary.duncanson_at_googlemail.com
> To: hadytannous_at_hotmail.com
> CC: ccielab_at_groupstudy.com
> Subject: Re: STP issue
> Date: Thu, 15 Oct 2009 12:52:57 +0100
>
> wr erase
> reload ;)
>
> just kidding. Have you looked at loopguard?
>
> Is this a problem in the field?
> ----- Original Message -----
> From: "hady tannous" <hadytannous_at_hotmail.com>
> To: "CCIE group study" <ccielab_at_groupstudy.com>
> Sent: Wednesday, October 14, 2009 9:43 PM
> Subject: STP issue
>
>
> > Hi,
> > I have 3 switches connected in a full mesh at a Customer's site.
> >
> > One Cisco 6500 switch and 2 NON CISCO switches. The NON CISCO switches
> > have
> > each 4 physical connections with the 6500 and 2 between each others. the
> > issue
> > is the following:
> >
> > The NON CISCO switches are supposed to form an etherchannel with the
6500,
> > but
> > they neither support LACP nor PAGP. Thus the only left etherchannel method
> > is
> > on.
> >
> > On the catalyst 6500 the configuration for the etherchannel is correct.
> >
> > The Loop occurs when my customer misconfigures the etherchannel from the
> > NON
> > CISCO switches side.
> >
> > We end up having etherchannel config from one end (6500) and normal links
> > from
> > the NON CISCO switches end.
> >
> > Since the etherchannel ports on the 6500 will have the same parameters,
> > all
> > the NON CISCO ports will end up forwarding and an STP loop is formed
> > causing
> > the network to go down.
> >
> > Now etherchannel guard is enabled but it's not putting the ports into
> > error
> > disable mode on the 6500 ( I guess because of compatibility between Cisco
> > and
> > Non Cisco Switches).
> >
> > Is there any way in case the customer misconfigures the NON CISCO switches
> > to
> > prevent a loop ?
> >
> >
> > Thx,
> > Hadi
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Received on Thu Oct 15 2009 - 20:09:18 ART