From: Arun Arumuganainar (aarumuga@hotmail.com)
Date: Tue Sep 20 2005 - 00:52:54 GMT-3
While answering a question . There could be a implicit answers and Explicit
answers .
Explicit Answer : Enable BPDU Filiter !!!!
Implicit Answer : Enable Portfast ( you can not enable bpdu guard feature )
I too do not agree with disabling STP as a solution to this problem . Port
fast with BPDU Guard looks much cleaner solution .
Thanks and Regards
Arun
----- Original Message -----
From: "Dennis J. Hartmann" <dennisjhartmann@hotmail.com>
To: <ccielab@groupstudy.com>
Sent: Tuesday, September 20, 2005 6:23 AM
Subject: Catalyst Specialties Question Interpretation
> I'm wondering how everyone would interpret the following question:
>
> Create VLAN 200 and assign port fast 0/20 to it on CAT2. Do not allow
BPDU
> traffic on this VLAN.
>
> The answer says to turn off STP on VLAN 200, but I disagree with this
> solution. Would turning off STP on a VLAN disallow STP traffic? I would
> think that STP could still propagate the switch, but it will not be
> interpretted by the switch because there will not be a static
> mac-address-table entry pointed to the CPU for this particular VLAN.
>
> I believe the solution is to enable one of the follwing commands
>
> (config-if)# spanning-tree portfast bpdufilter enable (the scenario did
not
> call for portfast though)
> (config-if)# spanning-tree bpdufilter enable (the scenario asked to not
> allow bpdu traffic on this VLAN. Since there's no global command that can
> not simultaneously filter the traffic from only VLAN 200, I think this is
> the correct answer). If there's any other ports in vlan 200, they must
have
> the same command applied to them.
> spanning-tree bpdufilter enable
>
>
> Comments?
>
> Sincerely,
>
> Dennis J. Hartmann
>
> White Pine Communications
>
> dh8@pobox.com
>
> CCSI#23402 / CCVP / CCIP / CCNP
>
> Cisco Optical, VPN & IDS Specialist
>
> MCSE
>
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