From: Osamah Shaheen (ShaheenO@maaden.com.sa)
Date: Mon Oct 06 2008 - 11:59:41 ART
In addition, The root guard ensures that the port on which root guard is enabled is the designated port. Normally, root bridge ports are all designated ports, unless two or more ports of the root bridge are connected together. If the bridge receives superior STP Bridge Protocol Data Units (BPDUs) on a root guard-enabled port, root guard moves this port to a root-inconsistent STP state. This root-inconsistent state is effectively equal to a listening state. No traffic is forwarded across this port. In this way, the root guard enforces the position of the root bridge.
This message appears after root guard blocks a port:
%SPANTREE-2-ROOTGUARDBLOCK: Port 1/1 tried to become non-designated in VLAN 77.
Moved to root-inconsistent state
________________________________
From: nobody@groupstudy.com on behalf of S Malik
Sent: Mon 06/10/2008 05:14 PM
To: Edouard Zorrilla
Cc: Gary Duncanson; nouman abbasi; Cisco certification
Subject: Re: BPDU
Can some one verify please, I guess bpdu-filter will silently drop bpdu pkts
if confgured on interface not globally.
BPDU-guard will put interface in err-disable mode if configured globbally.
On 10/6/08, Edouard Zorrilla <ezorrilla@tsf.com.pe> wrote:
>
> BPDU-Filter : it will silently drop the BPDU packets.
>
> BPDU-Guard : Put on ErrDisable one interface which receive BPDU packets.
>
> Regards
>
> ----- Original Message ----- From: "Gary Duncanson" <
> garyduncanson@btinternet.com>
> To: "nouman abbasi" <abbasi.nouman@gmail.com>
> Cc: "Cisco certification" <ccielab@groupstudy.com>
> Sent: Monday, October 06, 2008 5:41 AM
> Subject: Re: BPDU
>
>
> Wendall Odom's CCIE Routing and Switching guide.
>> pp82
>>
>> STP sanity for your network in the event someone adds rogue switches to
>> your infrastructure.
>>
>> HTH
>>
>> G
>> ----- Original Message ----- From: "nouman abbasi" <
>> abbasi.nouman@gmail.com>
>> To: "Cisco certification" <ccielab@groupstudy.com>
>> Sent: Sunday, October 05, 2008 11:43 PM
>> Subject: BPDU
>>
>>
>> Hi,
>>> What is the difference between BPDU-Filter // BPDU-Guard // ErrDisable??
>>> A practical Scenario when it can used??
>>>
>>> Regards
>>>
>>>
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>>
>>
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>>
>> _______________________________________________________________________
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>
>
> Blogs and organic groups at http://www.ccie.net <http://www.ccie.net/>
>
> _______________________________________________________________________
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