From: Rocco R21 (roccor21@hotmail.com)
Date: Tue Feb 20 2007 - 17:54:27 ART
Also, pay attention to the type of spanning-tree. In the case of MST the
command syntax can be different:
sw1(config)#spanning-tree mst 1 priority ?
<0-61440> bridge priority in increments of 4096
sw1(config)#spanning-tree mst 1 priority 4096 ?
<cr>
sw1(config)#spanning-tree mst 1 roo
sw1(config)#spanning-tree mst 1 root ?
primary Configure this switch as primary root for this spanning tree
secondary Configure switch as secondary root
>From: Lou Ioanni <louisccie_r_s@yahoo.com>
>Reply-To: Lou Ioanni <louisccie_r_s@yahoo.com>
>To: Gobind <gobind@inbox.com>, ccielab@groupstudy.com
>Subject: Re: Bridge Priority
>Date: Tue, 20 Feb 2007 10:59:29 -0800 (PST)
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>
>I am not sure if you refering to a specific lab exercise, but in real
>environments you can select which switch you want to be the Root Bridge for
>specific vlans by lowering the priority from the default 32768. The lower
>the priority the more prefered to be the root (example 32000). If you want
>to FORCE a specific switch to be the root then you set priority 0. For
>example:
>
>spanning-tree vlan 10-14 priority 0 (This will set this switch to be the
>root for vlans 10,11,12,13,14)
>
>You can set a different root bridge for each group of vlans for load
>balancing. You can direct certain vlans traffic through one distribution
>switch and other vlans through the other distribution reduntant switch for
>load balancing L2 traffic.
>
>Usually is good to set the L3 distribution switches as the Root bridges for
>the vlans attached to the access layer switches attached to it.
>
>Thanks,
>
>Loizos Y.
>CCIE#10702 R & S
>
>
>
>Gobind <gobind@inbox.com> wrote: Hi Guys,
>
>I have some confusion wiht the Bridge Priority.In Some CBTs I am getting
>to hear that:-
>
>Bridge Priority is Default Priority(32768) - Vlan Number
>
>I asked my friend,he said Default Priority is Default Priority + Vlan
>Number
>
>In one Cisco Dumentation it is written:-
>
>"Each VLAN on each network device has a unique 64-bit bridge ID
>consisting of a bridge priority value, an extended system ID, and an STP
>MAC address allocation"
>
>Source:- http://www.cisco.com/en/U
>S/products/hw/switches/ps708/products_configuration_guide_chapter09186a008016
>0a5b.html#wp1040218
>
>I am really confused(maybe I am getting it wrong) what Priority(in STP
>is),also I am not getting if the Priority is Default priority + Vlan
>Number or - Vlan Number then what Vlan Number is it refering to? I mean
>the Trunk belongs to every Vlan then which Vlan Number it takes while
>making the election.(when it sends BPDU i.e.)
>
>Gobind
>
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