VLAN 10(DATA VLAN) PORT COMING UP AS VLAN1 ON USER END

[Sencyty]

Hello Guys I have 2 of my distribution switches Vlan 10 port appearing as Vlan1 against original switch access vlan, what could be the problem? I just noticed this after the switch was upgraded and some clean up on the switch interfaces. 

Thank you, Earlier response will be appreciated.

[David Ruess]

Hello,

Usually if a port reverts back to vlan 1 from being on a other vlan after some changes it was because that vlan was removed. 

For example if you have vlan 10 on a switch and ports in vlan 10, then you remove vlan 10 the ports will revert back to vlan 1.

Is VLAN 10 configured on all switches that need it?

-David

[Sencyty]

Thank you David the configuration looks good all the Vlans are running on the switch. but when i do show interface Trunk  i noticed Vlan 1 was 'allowed and active in management domain also vlan 1 was 'in spanning tree forwarding state and not pruned

[David Ruess]

This is normal operation. I dont think you can prune vlan 1. If I remember correctly it uses vlan 1 as management messages like VTP, CDP, among others.

If you dont have any user ports assigned to VLAN 10 with a device physically connected, it wont show up/active on the switch and on trunks.

-David

[MHM Cisco World]

VTP

after upgrade of some change in config make change in VTP, 
this make VTP and VLAN 10 is missing from SW.

[Sencyty]

Thank you MHM,

Can you please give more details on your suggestion, i do appreciate.

[MHM Cisco World]

https://community.cisco.com/t5/switching/vlan-removed-after-the-switch-reload/td-p/2665676

Check this post.

[Georg Pauwen]

Hello,

post the full running configurations of both switches. Put descriptions on the ports connecting both switches, so we know which ports these are, as well as a description on the problem port, so we can identify it.