Solved: STP Question

serotonin888 · ‎06-02-2009

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

Edison Ortiz · ‎06-02-2009

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

HTH,

__

Edison.

View solution in original post

Edison Ortiz · ‎06-02-2009

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

HTH,

__

Edison.

serotonin888 · ‎06-02-2009

Thanks Edison - I guess I was hoping I could save some time ;-)

I will schedule a maintainence window.

Thanks again.

mgreenbaum · ‎06-02-2009

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