From: Russell Kelly \(rukelly\) (rukelly@cisco.com)
Date: Sat Jul 08 2006 - 11:32:35 ART
> 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.
This archive was generated by hypermail 2.1.4 : Tue Aug 01 2006 - 07:13:47 ART