RE: Spanning-tree

As already mentioned configure the switch to use Uplinkfast, this increases the STP propriety value to 49152. If all other switches are on default this switch can NEVER become root bridge.

Andy

-----Original Message-----
From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of Carlos G Mendioroz
Sent: 20 January 2011 00:55
To: dls152_at_cox.net
Cc: Shane K; Aaron; Haas, Brad; ccielab_at_groupstudy.com; Ronnie Angello
Subject: Re: Spanning-tree

Then, root-guard will not do for at least two things:
-It is not configured in "the switch", but on neighbours
-It will not prevent "the switch" from becoming root. In fact, there
will be more than one root :)

-Carlos

dls152_at_cox.net @ 19/01/2011 21:32 -0300 dixit:
> The requirement is to configure the switch not to be able to become root.
>
>
> ---- Shane K <shanekgs_at_gmail.com> wrote:
>> Another vote for rootguard.
>>
>> The "spanning-tree vlan root primary" command be considered setting
>> the priority depending on the requirements.
>>
>> S
>> Sent from my iPhone
>>
>> On 19 Jan 2011, at 22:31, Aaron <aaron1_at_gvtc.com> wrote:
>>
>>> wonder if this is what we could do, determine which switch has
>>> highest Mac address, then call that switch "switch 1" then I guess
>>> you could leave all switches at default prio 32768 and Mac would
>>> dictate who wins... And that highest numbered one (switch 1) would
>>> never win
>>>
>>> Aaron
>>>
>>> On Jan 19, 2011, at 1:33 PM, <dls152_at_cox.net> wrote:
>>>
>>>> I have four switches trunked together and wanted to know how to
>>>> keep switch 1 from every becoming root without using the priority
>>>> command. I hope this helps.
>>>>
>>>>
>>>> ---- "Haas wrote:
>>>>> Yes, but effectively it would prevent the other switch from
>>>>> seizing root bridge. I think that is what he was looking for...
>>>>> Otherwise maybe
>>>>>
>>>>> spanning-tree vlan x-y root primary !
>>>>>
>>>>> priority command is not used there either.
>>>>>
>>>>> I guess it depends on the point of view of which switch you are
>>>>> configuring... and what order they are patched in to each other,
>>>>> etc... rootguard seems the simplest solution.
>>>>>
>>>>> Maybe dsl152 can fill us in on more specifics...
>>>>> -Brad
>>>>>
>>>>> -----Original Message-----
>>>>> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On
>>>>> Behalf Of aaron1_at_gvtc.com
>>>>> Sent: Tuesday, January 18, 2011 2:47 PM
>>>>> To: Haas, Brad
>>>>> Cc: ccielab_at_groupstudy.com; Ronnie Angello; dls152_at_cox.net
>>>>> Subject: Re: Spanning-tree
>>>>>
>>>>> wouldn't rootguard cause the switch that rootguard is config'd on
>>>>> to then partition (isolate) that switch that is attempting to
>>>>> become root? is that what you (dsl152) were trying to
>>>>> accomplish? block/shutdown that switch that is attempting to
>>>>> become root?
>>>>>
>>>>>
>>>>>
>>>>> ----- Original Message -----
>>>>> From: "Brad Haas" <bradh_at_presidio.com>
>>>>> To: "Ronnie Angello" <ronnie.angello_at_gmail.com>, dls152_at_cox.net
>>>>> Cc: ccielab_at_groupstudy.com
>>>>> Sent: Tuesday, January 18, 2011 11:36:17 AM
>>>>> Subject: RE: Spanning-tree
>>>>>
>>>>> I second that... rootguard
>>>>>
>>>>> _______________________________________________________________________________
>>
>>
>>>>> Bradford Haas | Unified Communications Architect | CCIE 17887,
>>>>> CCVP, CCDP, MCSE | Northeast | Presidio Networked Solutions
>>>>> 10 Sixth Road, Woburn MA 01801 | bhaas_at_presidio.com
>>>>> D: 781.638.2258 | C: 781-223-1867 | www.presidio.com
>>>>> Fax: 781.970-1458
>>>>>
>>>>>
>>>>>
>>>>> -----Original Message-----
>>>>> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On
>>>>> Behalf Of Ronnie Angello
>>>>> Sent: Tuesday, January 18, 2011 11:30 AM
>>>>> To: dls152_at_cox.net
>>>>> Cc: ccielab_at_groupstudy.com
>>>>> Subject: Re: Spanning-tree
>>>>>
>>>>> Root Guard???
>>>>>
>>>>> On Tue, Jan 18, 2011 at 11:07 AM, <dls152_at_cox.net> wrote:
>>>>>
>>>>>> Can someone tell me how to prevent switch from becoming root
>>>>>> without
>>>>>> using priority command?
>>>>>>
>>>>>> Thanks!
>>>>>>
>>>>>>
>>>>>> Blogs and organic groups at http://www.ccie.net
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>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>> --
>>>>> Ronald Angello
>>>>> Senior Network Architect
>>>>> CCIE 17846
>>>>> CCDP, CCIP, CCNP
>>>>>
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-- 
Carlos G Mendioroz  <tron_at_huapi.ba.ar>  LW7 EQI  Argentina
Blogs and organic groups at http://www.ccie.net