VTP pruning will not reduce the number of STP instances. I don't really see the purpose of VTP pruning, and Cisco does also recommend to use manual pruning. I have found this is especially important on edge switches (29xx/35xx) where you're low on ST...
I think you ran out of STP instances.Your edge switch, a 3550, has a maximum of 128 STP instances, and with 55 VLANs and 2 trunk ports, you are already using 110 (55 x 2) unless you prune VLANs off the trunk. In addition, each 3550 access switch has ...
Yes, you should prune VLANs off the trunks.Check http://www.cisco.com/warp/public/473/21.html#vtp_span_treeThe manual way of pruning is the preferred way instead of enabling VTP pruning. If not, you will not reduce the number of STP instances. The do...
1) The default spanning tree mode is PVST+. You may have a network running Rapid-PVST+ on the core and PVST+ on the edge. Check for a spanning-tree mode command in the config.This link describes the differences between rapid STP and STP: http://www.c...
Sorry for the confusion. On your router, each VLAN has it's own subnet. If you have 50 + 200 nodes in each vlan, two class C subnets will do - like you've already did according to your config. What I really meant was that if you use a management netw...