I have a network with 2 VLANs (VLAN10, VLAN192). Right now VLAN192 is the native VLAN. I want to change the native VLAN from VLAN192 to VLAN10. However, when I make that change, I loose all connectivity accross my network. I am running a 2611(dot1q) and 7 2950s. 4 in VLAN10 and 3 in VLAN192. My trunk is on one of the VLAN10 switches. I have used the switchport trunk native vlan command on that trunk port, but still, as soon as I make the change, I loose all connectivity. What am I missing here? I can provide configs if needed.
native VLAN is always local on the trunk. So changing it should not brake connectivity across the network.
But you have to change it on both trunk sides.
If you are doing Telnet to a remote switch via the trunk you are changing it is necessary to change the remote side first - native VLAN change can disconnect your Telnet. Then change the local side of the trunk.
I changed the router side first, on s0/1.1 I used the command 'encapsulation dot1q 10 native' then changed the trunk port on the switch using 'switchport trunk vlan 10 native' and it is at that point I loose connectivity (client server, internet, email) I am doing all this via console cable.
When you do "sh int ... switchport" on the switch side do you see the trunk working OK?
What do you mean exactly by "I loose connectivity"? It means that routing between VLANs is not working? Are you able to ping from VLAN10 to any other VLAN? Are you ablo to ping the router interface inside VLAN10?
What is the original native VLAN? VLAN192? And everything is OK with it?
Can you provide the configs regarding s0/1 and subinterfaces and the trunk part of the switch config?
Not sure if this is exactly and only your problem based on the information you have provided, but here is something I recently found within my network that may be part of your problem. On the 2950 switches, as soon as you create another vlan interface (to change the management VLAN), the current active VLAN interface shuts itself. This effectively drops all connectivity to the switch remotely. It's due to a bug in the IOS code on 2950 switches that is not fixed yet.
I am also having the same problem. Please how did you solve it.
We already have a standard network with management VLAN 5. and naive VLAN on the trunks 1. When I now configure a 2950 to join, for me to be able to connect I put in a management van for 5 but this shut down vlan1.
And If I remember, it does need VLAN 1 to communicate to the devices on the other switches. Please how did you solve this
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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