06-04-2008 11:22 AM - edited 03-05-2019 11:25 PM
By default it is 1, but the company changed it to 20 for some reason.
I know how to set the native vtp trunk in Native mode, but how do you do it in CatOS. Searching hasn't turned up anything useful.
06-04-2008 11:27 AM
Use "set vlan X slot/port " . X is the vlan you want as native.
06-04-2008 12:36 PM
no, I want to change the native vlan that delivers VTP trunking info from Vlan20 to Vlan1.
in native mode:
switchport trunk native vlan 20
would set the vtp info from Vlan1 to Vlan20.
I don't think it is possible to change the native VTP vlan1 in CatOS v8.3x.
However, if a Cat switch running Native code sets its native vlan to 20, then the CatOS will comply on its end. If anyone knows differently please let me know
06-04-2008 12:40 PM
Doug
Glen is correct in what he said. To set the native vlan on a trunk link on CatOS you set the port into the vlan you want so to set the native VTP to vlan 20 on CatOS
set vlan 20 3/1
which sets the native vlan on port 3/1 to vlan 20. Remember that 3/1 is a trunk port not an access port ie.
set vlan 20 3/1 on an access port would put 3/1 into vlan 20. But on a trunk the port is not allocated to any one particular vlan. By using
set vlan 20 3/1 on a trunk port you are setting the native vlan.
Jon
06-04-2008 12:45 PM
ah, I see. was looking at the command from an access port view, not a trunk view.
I now understand. Thanks guys!
06-04-2008 12:49 PM
VTP is always sent with a Tag of 1 on a trunk regardless of what the native VLAN is and even if VLAN 1 is not in the list of allowed VLANs. Have a read of the 'Catalyst Control Plane Protocols' section of this document:
http://www.cisco.com/warp/public/473/103.html
HTH
Andy
06-04-2008 12:47 PM
VTP is always using vlan 1 for its communication, regardless of the native vlan. So changing the native in that case is of no use.
Regards,
Francois
06-04-2008 12:48 PM
Let me rephrase in fact;-) It has no use for VTP communication!
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