Changing Spanning Tree Priority on Cisco Switch


I had a an outside contractor help me with evaulating our Swtich network/setup/config.  It has been suggested that I move our root bridge for spanning-tree from our old CORE switches to our new CORE switches.  I was given the following commands to run.

Run on current CORE switch:
spanning-tree vlan 1-1000 priority 0

Run on old CORE switch:

spanning-tree vlan 1-1000 priority 4096

I am wondering what if any effects it would have on network performance.  I plan on running the command when only about 30 people out of 500 users are on the network. We have users logged in 24 hours a day.  Thank you in advance for your help!
Luke KalistaAsked:
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Don JohnstonInstructorCommented:
There is a possibility of an interruption of traffic while the network re-converges.  Impossible to say for sure without knowing the topology.  The interruption will not last longer than about 15 seconds though.

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In the case of changing root bridge full extend of interruption can be expected 30 - 50 seconds.
The best way to do it is to schedule maintenance. Send letter to inform users that there could be a temporary interruption(s) on date x.x.x and it will start at xx:xx hours, so they can plan their activities according to that. And don't tell them that interruption should last max 1 minute, who knows what could happen, you should also get yourself time to restore network as it was before if something goes wrong (new switch malfunctioning, bad cables etc) ...
If you do this change after hours, than there will be no interruption to the users.
If you are running rsvp, technically you can do it any time, but after hours is always better.
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