From: Andrew Larkins (andrew.larkins@BTGroup.co.za)
Date: Wed Jan 03 2007 - 09:53:42 ART
Hi,
There are 2 ways of doing this as you mentioned - both achieve the same
result. What I would rather do here is stay with the specific's being
asked in the question. If you enter the global command for bpduguard,
then all other portfast ports will disable - not required. The question
here relates only for the ports mentioned, so the longer way is the way
I would do it.
Spanning-tree bpduguard enable on an interface is only active once
portfast is configured as I understand it.
In real life I would use the global command for bpduguard default and
then portfast.
Semantics really:)
Regards
Andrew
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
mike chambo
Sent: 03 January 2007 14:41 PM
To: Cisco certification
Subject: bpduguard
Question:
Enable Portfast on interfaces g1/0/12 thru g1/0/16.
Make sure that the switch will shut down any of these interfaces if it
receives a BPDU on one of them.
Solution provided:
int ran g1/0/12 - 16
spanning-tree portfast
spanning-tree bpduguard enable
this seems logical but my reading or my confusion seems to lead me to
believe that:
if portfast is enabled on the interface, then you don't need to
activate bpduguard on the same interface; enter spanning-tree portfast
bpduguard default (a global command) instead.
That is:
globally enter:
spanning-tree portfast bpduguard default
and at the Interface level:
Interface range g1/0/12 - 16
spanning-tree portfast
or simply enter:
int ran g1/0/12 - 16
spanning-tree bpduguard enable
Michael Chambo
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