Re: bpdu-filter question

Hey team,

I created some more VLANs and tried some additional testing. I do not want
to state all the answers, however ... the lab testing is not as interesting
when only using the one port and when it is in trunk mode. So ... testing
bdpufilter is not as interesting in this mode.

My suggestion: Use the command I mention, and enable and disable
bpdufilter. Watch the bpdu counters during your testing. Also, if you can,
configure another interface while it is shut down. perform a no shut on the
interface and watch it transition through spanning tree. A nice learning
this is.

Kindest regards team and have a great night!

Andrew

On Wed, Nov 4, 2009 at 11:02 PM, Joe Astorino <jastorino_at_ipexpert.com>wrote:

> So far as I know bpdufilter will filter both incoming and outgoing
> BPDUs...so it essentially is disabling spanning-tree on the port. As far
> as
> enabling it on portfast enabled ports, are you sure you aren't talking
> about
> bpduguard? That is pretty common so that if we get a bpdu on a port that
> should be connected to a host we simply shut down the port.
>
> On Wed, Nov 4, 2009 at 10:23 PM, <Keegan.Holley_at_sungard.com> wrote:
>
> > GS,
> >
> > I recently watched a recorded bootcamp that stated that bpdu filter will
> > revert back to the default spanning tree behavior if it sees a bpdu. They
> > also say should be enabled on port fast ports to avoid loops. I seem to
> > have found conflicting documentation on cisco.com one page states that
> the
> > bpdu's are blocked constantly and the other pretty much agrees with the
> > vendor. I tried this on a 3550 running 12.2(40) see2 and bpdu's were
> > blocked no matter what. Did this change across code releases/platforms
> or
> > are they just wrong?
> >
> >
> > Heads:
> >
> >
> http://www.cisco.com/en/US/docs/switches/lan/catalyst3560/software/release/12.2_44_se/configuration/guide/swstpopt.html#wp1033638
> >
> > tails:
> >
> >
> http://www.cisco.com/en/US/docs/switches/lan/catalyst4000/7.4/configuration/guide/stp_enha.html
> >
> >
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> >
> >
> >
> >
> >
>
>
> --
> Regards,
>
> Joe Astorino CCIE #24347 (R&S)
> Sr. Technical Instructor - IPexpert
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-- 
Andrew Lee Lissitz
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