hi,
On one of the switches running CatOS you could use the following commands:-
Set spantree root 11,13,15,17,19 (This would set the bridge priorities for the following vlans 11,13,15,17,19 to 8192)
Set spantree root secondary 12,14,16,18 (This would set the bridge priorities for the following vlans 12,14,16,18 to 16384)
Or alternatively you could use the following command to lower the priority even further
set spantree priority 1 11
set spantree priority 2 12
set spantree priority 1 13
set spantree priority 2 14
set spantree priority 1 15
set spantree priority 2 16
set spantree priority 1 17
set spantree priority 2 18
set spantree priority 1 19
The other switch would be configured as follows:-
Set spantree root 12,14,16,18
Set spantree root secondary 11,13,15,17,19
Or
set spantree priority 2 11
set spantree priority 1 12
set spantree priority 2 13
set spantree priority 1 14
set spantree priority 2 15
set spantree priority 1 16
set spantree priority 2 17
set spantree priority 1 18
set spantree priority 2 19
for the MSFC’s I would be tempted to use HSRP, with one 6509 being the active for odd vlans and the other for even vlans.
