From: Shahid Ansari (shahid1357@gmail.com)
Date: Fri Aug 22 2008 - 04:56:55 ART
*Try this ..*
**
*Cost = Towards root*
*Port-priority - Away from the Root*
*Thanks*
*Shahid*
On Fri, Aug 22, 2008 at 6:30 AM, Mark Stephanus Chandra <
mark.chandra@gmail.com> wrote:
> Hi Daniel,
>
>
>
> Thanks a lot for the explanation, so in other words, we use port-priority
> when we configure in root bridge swith. Port-priority is for election of
> designated port right ? So if we configure in no root bridge switch, it
> doesn't have effect right ?
>
>
>
> We configure path cost for election of non root bridge switch, right ?
>
>
>
> Regards
>
>
>
> Mark Stephanus Chandra
>
>
>
>
>
>
>
> From: Daniel Valle [mailto:danielfrvalle@gmail.com]
> Sent: Friday, August 22, 2008 1:32 AM
> To: Mark Stephanus Chandra
> Cc: ccielab@groupstudy.com
> Subject: Re: Spanning Tree Question
>
>
>
> Mark,
>
>
>
> Cost we use in the incoming switch, for example.. if SW1 is the root, the
> Cost must be applied in SW2, otherwise it'll not any effect ( this is
> similar to IGP metrics. the metric that matters is always the inbound
> interface)
>
>
>
> port priority is to be configured in the designated port. i.e, in your
> case,
> you should configure port priority in SW1 ( which is the root)
>
>
>
> if you have a 3rd switch SW1==SW2==SW3, you must use port-priority in the
> SW2 port to influence SW3 decision.
>
>
>
> resuming: use Port-priority in designated ports and use port-cost in root
> or
> alternative(blocked) ports
>
>
>
>
>
> HTH,
>
>
>
> Daniel
>
>
>
>
>
> On 8/21/08, Mark Stephanus Chandra <mark.chandra@gmail.com> wrote:
>
> Dear All Expert,
>
> I'm kinda confuse with the used of SPT port-priority and SPT path cost.
>
> Actually when I do my IEWB vol 2 lab 11.
>
> To influence path decision, when doing SPT.
>
> SW1 --------------- SW2
>
> SW1 is the root bridge
>
> Actually SW 1 have three trunk connection to SW2, let say FA0/15,fa0/14 and
> fa0/13
>
> so the command is, SW1 should use Fa0/15 as its primary link to SW2, when
> fa0/15 fail, then it choose fa0/13 and the last is fa0/14.
>
> So, if I configure fa0/15 with spt cost 1 , do i have the same result if i
> configure fa0/15 with spt port-priority of let say 15 (the default is 128
> right ?)
>
> So kinda confuse when do we have to use spt priority or cost
>
> Thanks in advance
>
>
>
>
> --
> Mark Stephanus Chandra
>
>
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