I have two core 6509 switches (one upstairs and one down stairs, not redundant) with two 3560 switches trunked up to one of the 6509s.
I would like to add a third 3550 switch to use as a spare upstairs, in case one of the blades fails on the 6509.
I want to use a fiber link between the two and want to make sure I do not interrupt STP too much.
Is there anything precautionary I need to do to prevent any problems?
The only config on the core switch switch is:
no spanning-tree optimize bpdu transmission
spanning-tree extend system-id
I see no priority set up anywhere