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Wired Networks Thread, Cisco vlan entry missing in vlan.dat, but appears in running-config in Technical; One of our vlan's (ID: 104) stopped working suddenly and computers on that vlan failed when trying to obtain a ...
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    Cisco vlan entry missing in vlan.dat, but appears in running-config

    One of our vlan's (ID: 104) stopped working suddenly and computers on that vlan failed when trying to obtain a dhcp ip address.

    On the Cisco switch if we do show vlan, this command is supposed to shows the vlans in the vlan.dat file. We notice it has every other vlan except the one that is now missing.

    If we show the running-config or even the startup config, they DO show the missing vlan (as if everything is fine), but that vlan doesn't take effect.

    We tried deleting the "missing" vlan using clear vlan 104, but it says No subinterface configured for vLAN Identifier 104, so it's already missing. Recreating the vlan, saving and rebooting still doesn't add it into the vlan.dat or make the vlan work.

    The switch is in vtp server mode. Any ideas appreciated.
    Last edited by nLinked; 25th June 2013 at 09:12 AM.

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    Maybe if you attached your switch config, one of us could help?

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    Thanks, I've attached the startup-config. The VLAN we're having trouble with is 104. Any suggestions most appreciated.
    Attached Files Attached Files
    Last edited by nLinked; 25th June 2013 at 03:50 PM.

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