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STP Root bridge

Posted on 2010-11-19
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Last Modified: 2012-05-10
Hi Experts,

If root bridge for a specfic user vlan is not the core switch of the network  and if the root bridge cost from core switch is very high does that affect the users connected to that vlan?

Thanks,
phoenix
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Question by:phoenix26
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5 Comments
 
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by:JFrederick29
JFrederick29 earned 500 total points
ID: 34178026
Things will still work but it may not be the most efficient path through the network.  Best to make the core switch the root bridge for that VLAN.
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Author Comment

by:phoenix26
ID: 34178078
Hi Expert,

Thanks.For other two vlans in the network the prioroty is configured as this in the core switch spanning-tree vlan x,y priority 24576.these vlans have root bridge as core.What command should I give to  change the uservlan to same proority?I believe I should give this in global config mode.


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LVL 43

Assisted Solution

by:JFrederick29
JFrederick29 earned 500 total points
ID: 34178084
conf t
spanning-tree vlan z priority 24576

Where z is the new VLAN.
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Author Comment

by:phoenix26
ID: 34179702
Hi Expert,

Can this command be run during production times?I assume spanning tree will be recalculated when this command is issued
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LVL 43

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JFrederick29 earned 500 total points
ID: 34179951
Yes, a recalculation will occur so it's best to run off-hours or during maintenance window just in case.
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