STP Question

Answered Question
Jun 2nd, 2009
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Hi All,


If you have pvst+ configured in a network and one switch has a lower MAC address than all the others it will be the root bridge (assuming you havent set a any priorities).If you want to force that to be the root bridge and set a lower priority will this cause spanning-tree reconverge?


i.e Would this cause a brief outage on the LAN? Or should i schedule some downtime?


Many Thanks

Correct Answer by Edison Ortiz about 7 years 12 months ago

Any Spanning-Tree modifications should be done during a maintenance window.


HTH,


__


Edison.

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Correct Answer
Edison Ortiz Tue, 06/02/2009 - 08:50
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Any Spanning-Tree modifications should be done during a maintenance window.


HTH,


__


Edison.

serotonin888 Tue, 06/02/2009 - 10:50
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Thanks Edison - I guess I was hoping I could save some time ;-)


I will schedule a maintainence window.


Thanks again.

mgreenbaum Tue, 06/02/2009 - 10:54
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Any time that you change the root bridge on a PVST/STP environment, you will force a BPDU to go out to all the switches and a reconvergence to occur.


I would highly recommend scheduling some downtime.


I would also recommend looking into converting to Layer 3 connections between the devices to reduce and remove STP from the network. The routing protocols have a faster reconvergence than Spanning Tree in the event of a link failure. Check out some of the SRND documents on this at http://www.cisco.com/en/US/netsol/ns742/networking_solutions_program_category_home.html

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