1. First, you will need to identify the VLAN you wish to change. With Cisco switches (not sure about others yet), you can change the root bridge ID for each VLAN individually. Warning! This may/will cause a re-convergence on the network. My lab environment noticed very little issues, but again just a home lab and a medium/large network this can take down your network as everything tries to readjust. Again, all of my SOPs/tips have been done in a home lab, always follow proper procedures before performing changes on your live/home network.
2. Make sure you design/choose your switch you wish to be root carefully. Usually, you want your big/fast switches to be the root so you don’t have your traffic handicapped at a small/slow switch. It is all depending on how you wish to design it.
3. Once you identify your VLAN, perform the following to change the priority:
a. #configure terminal
i. #spanning-tree vlan XXX priority 4096
1. Numbers start from 0 and increment in the number 4096 intervals. So example: 0, 4096, 8192, 12288 etc.
ii. #exit
b. #write
4. Sometimes this is quick, sometimes this can take a little time for the switches to readjust. Just a few simple commands, but can make a huge difference on the speed of your network.
Reference: https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2960/software/release/12-2_53_se/configuration/guide/2960scg/swstp.html
2. Make sure you design/choose your switch you wish to be root carefully. Usually, you want your big/fast switches to be the root so you don’t have your traffic handicapped at a small/slow switch. It is all depending on how you wish to design it.
3. Once you identify your VLAN, perform the following to change the priority:
a. #configure terminal
i. #spanning-tree vlan XXX priority 4096
1. Numbers start from 0 and increment in the number 4096 intervals. So example: 0, 4096, 8192, 12288 etc.
ii. #exit
b. #write
4. Sometimes this is quick, sometimes this can take a little time for the switches to readjust. Just a few simple commands, but can make a huge difference on the speed of your network.
Reference: https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2960/software/release/12-2_53_se/configuration/guide/2960scg/swstp.html
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