From: Huan Pham (Huan.Pham@peopletelecom.com.au)
Date: Wed Dec 24 2008 - 04:58:55 ARST
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
Blogs and organic groups at http://www.ccie.net
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