Spanning Tree - New Vlan Interface

[e_dunnington]

Hello,

This is a noob question but i am doubting myself so i wanted to drop a discussion here to get the answer. In our current network, i am building out a management vlan so that SSH traffic and such can be used rather than through the normal data vlans. My question is this, currently i have a 2960x Stack configured with an IP address on 1 vlan, i want to remove that IP on that vlan and bring up my management vlan. Will that cause a spanning tree recalculation?

Vlan 10 - IP xx.xx.xx.xx (Remove)

Vlan 20 - IP xx.xx.xx.xx (Add)

Please let me know, any explanation is always helpful.

Thanks in advance.

[Jon Marshall · Accepted solution]

If you are running a version of PVST then creating the vlan at L2 is what causes an STP calculation but only for that vlan. 

Changing the IP address and/or bringing up a L3 vlan interface should have no effect on STP. 

Jon

[e_dunnington]

No, i have already created the actual vlan inside of the vlan table. But assigning the IP address to it is the task i am taking on.

So based on what you said i should be good. Just want to be sure is all.. Thanks

[Reza Sharifi]

As also Jon noted, changing the IP has no effect on STP.  If you want to change the mgmt IP, make sure you login using a regular data vlan/IP (non-mgmt IP). This way when you change IP, you don't lose your connection to the device.

HTH