if my two switchs connected with each other using two link... now one switch A is root bridge and other switch B is the non-root and had one port in blocking state and other is in non blocking.... now i want to change the ports status.... which paramter will be consider first... .port priority or cost?
You can play around with both PORT COST as well as PORT PRIORITY.
If you manipulate port cost do it on the upstream switchport as port cost is carried in BPDU from root switch to the downstream switch which build the path cost from that switch to the root switch so change it on upstream switch.
If you are playing around with PORT Priority you have to do it on the downstream switch port as it takes into affect on the switch where it is changed.
So in your case when you have 2 parallel connections between switch A and switch B and switch A is working as a root switch and you want to play with POR COST change it on Switch A and if you wnat to play with port priority do it on the switch B.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...