From: Carlos G Mendioroz (tron@huapi.ba.ar)
Date: Fri May 28 2004 - 09:50:15 GMT-3
You are missing the first check, which is path cost.
Only when comparing even path costs comes the sending switch ID
comparison...
Phil wrote:
> I agree, there is only one root bridge, but the STP
> path is built by first, checking the bridge
> priorities, then the port priorities and last, the
> port cost.
>
> You can manipulate the bridge priorities in you domain
> as you please to build the STP path you want.
>
> By default all bridge priorities are 32768, issuing
> the command spanning-tree root primary lowers the
> priority to 8192 and spanning-tree root secondary
> lowers the priority to 16384. Because the other two
> switches still have a priority of 32768 the link
> between them will be blocked.
>
> Phil
>
> --- Carlos G Mendioroz <tron@huapi.ba.ar> wrote:
>
>>I don't think so.
>>There's only one root bridge in a converged STP
>>domain.
>>Changing a non-root bridge priority will have no
>>impact in the STP
>>topology...
>>
>>
>>Phil wrote:
>>
>>
>>>Tom,
>>>
>>>You have to make cat2950#1 the secondary root to
>>>acomplish this. First, STP checks the bridge
>>
>>priority
>>
>>>and then the port cost as a tie breaker.
>>>
>>>Phil
>>>
>>>--- Tom Young <gitsyoung@yahoo.co.jp> wrote:
>>>
>>>
>>>>Hi, group
>>>>
>>>> I confused on the spantree question. I
>>
>>connected
>>
>>>>the
>>>>network as below, two cat6509s and two cat2950s,
>>
>>the
>>
>>>>cat6509#1 for the STP root and the cat6509#2 for
>>
>>the
>>
>>>>secondary root. The port that connect cat2950#1
>>
>>from
>>
>>>>cat2950#2 was blocked by STP function. I want to
>>>>block the
>>>>port that from Cat6509#2 to Cat2950#2. I tried the
>>>>next
>>>>two commands, but failured, how can I do ? Help
>>>>me,please.
>>>>
>>>>set spantree portvlancost 3/3 cost 200
>>>>set spantree portcost 3/3 cost 200
>>>>(the port 3/3 of cat6509#2 was connected with
>>>>cat2950#2)
>>>>
>>>> cat6509#1------cat6509#2
>>>> | |
>>>> | |
>>>> cat2950#1------cat2950#2
>>>>
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>>>>
>>>
>>>
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>>>
>>>
>>>
>>>
>>>
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>>
> _______________________________________________________________________
>
>>>Please help support GroupStudy by purchasing your
>>
>>study materials from:
>>
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>>
>>--
>>Carlos G Mendioroz <tron@huapi.ba.ar> LW7 EQI
>>Argentina
>>
>
>
>
>
>
>
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-- Carlos G Mendioroz <tron@huapi.ba.ar> LW7 EQI Argentina
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