Re: Root port

Idowu,
thanks but I'm against rules. I've already proposed an anty rule
movement, but so far my party has only one member :(

Cost is added at the destination switch to whatever path cost
is received in BPDUs, so it has (first hand) a local efect.

Priority is a tie breaker, a second level tie breaker.
First level is BID. And it comes informed as port ID. It is the same
data that is used to decide which bridge gets to be DP to a segment.

Now I'm cool again :)
-Carlos

just kennie @ 21/4/2010 11:31 -0300 dixit:
> 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
> <mailto: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
> Mailto: jastorino_at_ipexpert.com <mailto:jastorino_at_ipexpert.com>
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> -----Original Message-----
> From: Carlos G Mendioroz <tron_at_huapi.ba.ar
> <mailto:tron_at_huapi.ba.ar>>
> Date: Wed, 21 Apr 2010 09:50:15 To: Joe
> Astorino<jastorino_at_ipexpert.com <mailto:jastorino_at_ipexpert.com>>
> Cc: just kennie<justkennie_at_gmail.com
> <mailto:justkennie_at_gmail.com>>; CCIE
> Groupstudy<ccielab_at_groupstudy.com <mailto: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 <mailto:jastorino_at_ipexpert.com>
> Telephone: +1.810.326.1444
> Live Assistance, Please visit: www.ipexpert.com/chat
> <http://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
> <http://www.ipexpert.com/communities> and our public website
> at www.ipexpert.com <http://www.ipexpert.com>
> -----Original Message-----
> From: just kennie <justkennie_at_gmail.com
> <mailto:justkennie_at_gmail.com>>
> Date: Wed, 21 Apr 2010 12:09:51 To: Cisco
> certification<ccielab_at_groupstudy.com
> <mailto: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)
>
>
> Blogs and organic groups at http://www.ccie.net
>
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>
>
>
>
>
>
>
> --
> Carlos G Mendioroz <tron_at_huapi.ba.ar <mailto:tron_at_huapi.ba.ar>>
> LW7 EQI Argentina
>
>

-- 
Carlos G Mendioroz  <tron_at_huapi.ba.ar>  LW7 EQI  Argentina
Blogs and organic groups at http://www.ccie.net