I have some 2950's in production that I noticed did not have spanning-tree instances for every VLAN our network has(We are running PVST+). So I did some research and found that 2950's only support 64 Spanning tree instances, and at the time our network had about 80 VLANs.
After a few weeks of retiring old VLANs and consolidation, I got the number down to 64. However when I look on some of our 2950s, several of our VLANs still don't have spanning-tree instances. Do I have to reboot the switches or something to get these instances to start or should it happen automatically?
Right now our VTP domain is sitting right at 64 VLANs. In the new few days I expect to have that number down to 55.
Perhaps this is because it is reserving room for the built-in VLANs like 1002-1005 or something?
Any opinions/experience are welcome.