Re: Root port

Carlos,.... to alter the root port selection of a switch locally, use the
cost, to influence the root port selection of (adjacent) neighor, use
port-priority.

Idowu Kehinde
CCNA
CCNP
CCIP
CCIE (written)

On Wed, Apr 21, 2010 at 2:02 PM, Carlos G Mendioroz <tron_at_huapi.ba.ar>wrote:

> Are you saying that port cost is not what makes up the root path cost ?
>
>
> Joe Astorino @ 21/4/2010 9:54 -0300 dixit:
>
> You are confused : )
>>
>> Of course you can set port priority on your local switch -- it just has
>> nothing to do with what port on that local switch goes forwarding.
>> The port priority contained in the incoming BPDU is what matters there.
>>
>> I recommend you lab this up using the original scenario presented
>>
>>
>> Sent from my Verizon Wireless BlackBerry
>>
>> Regards,
>>
>> Joe Astorino - CCIE #24347
>> Sr. Technical Instructor - IPexpert
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>> -----Original Message-----
>> From: Carlos G Mendioroz <tron_at_huapi.ba.ar>
>> Date: Wed, 21 Apr 2010 09:50:15 To: Joe Astorino<jastorino_at_ipexpert.com>
>> Cc: just kennie<justkennie_at_gmail.com>; CCIE Groupstudy<
>> ccielab_at_groupstudy.com>
>> Subject: Re: Root port
>>
>> Joe,
>> Either I'm confused or...
>>
>> Port priority is a local thing, and port cost is what STP adds up to
>> inform the rest of the connected network the path cost to the root,
>> so hardly a local thing.
>>
>> -Carlos
>>
>> Joe Astorino @ 21/4/2010 8:34 -0300 dixit:
>>
>>> What you read is simply not true. STP cost is a local thing. If you want
>>> to influence the root port of B by changing something on A you need to use
>>> port priority
>>>
>>>
>>> Sent from my Verizon Wireless BlackBerry
>>>
>>> Regards,
>>>
>>> Joe Astorino - CCIE #24347
>>> Sr. Technical Instructor - IPexpert
>>> Mailto: jastorino_at_ipexpert.com
>>> Telephone: +1.810.326.1444
>>> Live Assistance, Please visit: www.ipexpert.com/chat
>>> eFax: +1.810.454.0130
>>>
>>> IPexpert is a premier provider of Self-Study Workbooks, Video on Demand,
>>> Audio Tools, Online Hardware Rental and Classroom Training for the Cisco
>>> CCIE (R&S, Voice, Security & Service Provider) certification(s) with
>>> training locations throughout the United States, Europe, South Asia and
>>> Australia. Be sure to visit our online communities at
>>> www.ipexpert.com/communities and our public website at www.ipexpert.com
>>> -----Original Message-----
>>> From: just kennie <justkennie_at_gmail.com>
>>> Date: Wed, 21 Apr 2010 12:09:51 To: Cisco certification<
>>> ccielab_at_groupstudy.com>
>>> Subject: Root port
>>>
>>> I have two switches A and B connected together through two trunks A1 ----
>>> B1, and A2 ---- B2. present the root bridge is A, and all the ports are
>>> forwarding. As for B, the root port is B1, and B2 in blocking. My
>>> question
>>> is how do I make B2 forwaing on B. On my lab I reduced the cost of B2 on
>>> B
>>> from 19 to 10, and it works. Bu on cisco site, I was told you will reduce
>>> the cost of A2 on A for B2 to be the root port on B. Please assist.
>>>
>>>
>>>
>>> Idowu Kehinde
>>> CCNA
>>> CCNP
>>> CCIP
>>> CCIE (written)
>>>
>>>
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>>>
>>
> --
> Carlos G Mendioroz <tron_at_huapi.ba.ar> LW7 EQI Argentina

Blogs and organic groups at http://www.ccie.net
Received on Wed Apr 21 2010 - 15:31:08 ART