From: Michael Stout (michaelgstout@hotmail.com)
Date: Sat Jul 08 2006 - 12:55:42 ART
We did some research on this topic last year and i beleve the results
were as you describe them.
--------------------------------------------------------------------
From: "Russell Kelly (rukelly)" <rukelly@cisco.com>
Reply-To: "Russell Kelly (rukelly)" <rukelly@cisco.com>
To: <ccielab@groupstudy.com>
Subject: BPDU Filter Question
Date: Sat, 8 Jul 2006 16:32:35 +0200
> Hi All,
>
> If I want to enable portfast on an interface but want it to revert
to
> 'normal' operation if any BPDU's are received on the port, then I
> thought the only option was to do the following:
>
> (config)spanning-tree portfast bpdufilter default
>
> This needs to be done in global config mode because if I do the
> interface gonfiguration (below) I don't get the same action from
the
> switch:
>
> (config-if)spanning-tree portfast
> (config-if)spanning-tree bpdufilter enable
>
> (as in the IE WB answers guide)
>
>
> The doc CD states that when portfast and bpdufilter are enabled
> globally if any bpdu's are received on an interface then it reverts
to
> normal state in STP -- if it's enabled on the interface then this
just
> stops BPDU's and the port can cause an STP loop (esp with portfast
> enabled)
>
> Therefore BPDU filter behaves completely differently if enabled on
an
> interface or if enabled globally -- it doesn't switch the port back
to
> normal mode if enabled on an interface level.
>
> Any comments?
>
> Thanks.
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