I am migrating from a pair of 4510s to a pair of 6509s with as little disruption as possible. Any suggestions on how to do so when it comes to spanning tree?
The 4510s are configured as root at bridge priority 4096 and secondary at 8192. I was going to add in the 6509s as 12288 and 16384 and create a square design with all 4 switches. The access switches are a combination of 2950s, 3750s and 4948s with Etherchannel uplinks on some switches.
All access switches are configured with uplinkfast and the network is running PVST+ I'm trying to decide how to migrate the uplink ports on the access switches. I know I can move the blocking port to the new switches without disruption. I also know that I can move the root port and uplinkfast will fail to the other uplink subsecond. I also know that uplinkfast will wait 30-45 seconds to switch back from the "secondary" port to the root port, but what happens if the formerly root port is no longer in the root switch when it comes back up?
I realize there are many options so any input would be greatly appreciated.