From: Darby Weaver (ccie.weaver@gmail.com)
Date: Wed Dec 24 2008 - 13:19:11 ARST
Personal Preference... or the concept of "always" be the root bridge.
Careful cause one might get twisted on whether the value of 0 is required or
if whether the a feature like root guard is required. Maybe you might need
both.
On Wed, Dec 24, 2008 at 1:58 AM, Huan Pham
<Huan.Pham@peopletelecom.com.au>wrote:
> Both should do the job! I personnally usually do "span mst 1 root
> primary", although I know the other command is more reliable.
>
> If you have not got your trunks working properly and you issue "span mst
> 1 root primary" on one switch, but one of other switches have lower
> priority value than the default, then when the trunk is fixed, the
> switch with lower priority value will become the root, and not the one
> you want! This trunking issue is quite common, e.g. due to the fact that
> trunks between 3560 do not form by default, or maybe the trunk ports are
> shutdown as part of lab bamboo trap design, so be carefull with this
> caveat.
>
> Whatever way you configure it (set priority to 0 or use the macro), it
> is more important to know how to verify your configuration, by issuing
> "sh spanning-tree mst" for MST or "show spanning-tree vlan" for PVST on
> each switch and make sure that they all agree on the spanning-tree root
> election.
>
> If you verify your config properly, then both configs do exactly the
> same job. It's only a personnal preference I think.
>
> Huan
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> John Edom
> Sent: Wednesday, 24 December 2008 4:37 PM
> To: Cisco certification
> Subject: Root Bridge -Best Way
>
> Hi,
>
> we can make mst or pvst root bridge using either "span mst 1 root
> primary"
> or "span mst 1 prio 0" so i want to know which one best way preceptive
> of lab exam or in other ways what criteria to choose one on the other ?
>
> Regards
>
>
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