08-06-2007 06:12 AM - edited 03-05-2019 05:43 PM
How can i do that?
I mean, how can i forbid VLAN1 (or a range of VLANs) to enter the trunk link of my switch?
08-06-2007 06:18 AM
The concept is called pruning.
You can do automatic pruning by enabling VTP Pruning on a VTP server or manually pruning per port with the 'switchport trunk allowed vlan' command.
Please get familiar with Vlans by reading this document
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat3560/12225see/scg/swvlan.htm
08-06-2007 06:24 AM
Hi,
The way to remove the vlans is by using "SWITCHPORT TRUNK ALLOWED VLAN REMOVE VLAN ID".
Vlan 1 minimization (Deleting vlan1 from individual trunk) is not allowed on release
12.1(12c EA1) which you are running. This might be causing all the problem (Stopping
protocol packets which can only be communicated through vlan1 ).
Vlan1 minimization is supported from release 12.1(14)EA1 . This is documented in the
following link ( Please look at "new software features" )
http://www.cisco.com/univercd/cc/td/doc/product/lan/c3550/12114ea1/ol395001.
htm#312746
Regards,
~JG
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