From: Joe Astorino (joe_astorino@comcast.net)
Date: Thu Mar 26 2009 - 14:17:20 ART
I don't think we are all on the same page here :) Divin, I understand what you are saying, and I understand how root guard works, but I don't understand what this has to do with the task at hand (make sure a port on a non-root switch never becomes the root port, which is entirely different than becoming the root bridge)
"He not busy being born is busy dying" -- Dylan
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----- Original Message -----
From: "Divin Mathew John" <divinjohn@gmail.com>
Cc: "Bryan Bartik" <bbartik@ipexpert.com>, "oluwaseyi ojo" <sameoj@gmail.com>, "ftt" <femi0802@googlemail.com>, ccielab@groupstudy.com
Sent: Thursday, March 26, 2009 1:14:25 PM GMT -05:00 US/Canada Eastern
Subject: Re: STP Root port Eligibility
Joe,
Root Guard just makes sure. thatconsider this scenario
Sw1 -----> Sw2 --->sw3
SW1 is the root now u have root guard on the Sw2 port connecting to
sw3. now even if u add a switch sw4 after sw3 in the topology and even
if it has a superior BPDU it will not oust SW1 as the root
Thanking You
Yours Sincerely
Divin Mathew John
divinjohn@gmail.com
divin@dide3d.com
+91 9945430983
+91 9846697191
+974 5008916
PGP PUBLIC KEY BLOCK @ http://www.dide3d.com/divin_Public_PGP_key.txt
Sent from: Bangalore KA India.
On Thu, Mar 26, 2009 at 10:41 PM, Joe Astorino <joe_astorino@comcast.net> wrote:
> I think I see what you are saying now Bryan -- Are you saying to put root
> guard on the port that should never become the root port? That way, when it
> hears BPDUs from the root switch, it will shut down the port? Definitely
> "outside the box" way of using root guard, but I guess that would work!
>
> "He not busy being born is busy dying" -- Dylan
>
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>
> ----- Original Message -----
> From: "Bryan Bartik" <bbartik@ipexpert.com>
> To: "Divin Mathew John" <divinjohn@gmail.com>
> Cc: "oluwaseyi ojo" <sameoj@gmail.com>, "ftt" <femi0802@googlemail.com>,
> ccielab@groupstudy.com
> Sent: Thursday, March 26, 2009 1:00:14 PM GMT -05:00 US/Canada Eastern
> Subject: Re: STP Root port Eligibility
>
> The task says that the port should never be "root port"...A port becomes
> root port when it hears superior BPDUs. How can you block these?
>
> You are not preventing the downstream ports from using this switch as root.
>
> On Thu, Mar 26, 2009 at 10:54 AM, Divin Mathew John
> <divinjohn@gmail.com>wrote:
>
>> Root guard allows the device to participate in STP as long as the
>> device does not try to become the root. If root guard blocks the port,
>> subsequent recovery is automatic. Recovery occurs as soon as the
>> offending device ceases to send superior BPDUs.
>>
>>
>> http://www.cisco.com/en/US/tech/tk389/tk621/technologies_tech_note09186a00800ae96b.shtml#diff
>>
>> Exactly...normal STP will function but.! a New root cannot takeover
>> sending BPDU's from that port.! thats all
>> Thanking You
>>
>> Yours Sincerely
>>
>> Divin Mathew John
>> divinjohn@gmail.com
>> divin@dide3d.com
>> +91 9945430983
>> +91 9846697191
>> +974 5008916
>> PGP PUBLIC KEY BLOCK @ http://www.dide3d.com/divin_Public_PGP_key.txt
>>
>>
>>
>> On Thu, Mar 26, 2009 at 10:21 PM, Bryan Bartik <bbartik@ipexpert.com>
>> wrote:
>> > rt. Even with root guard enabled on one port, other ports can be root po
>>
>
>
>
> --
> Bryan Bartik
> CCIE #23707, CCNP
> Sr. Support Engineer - IPexpert, Inc.
> URL: http://www.IPexpert.com
>
>
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