Cisco WS-C2960-24TC-S-RF Software Guide - Page 237
Disabling a Trunk Port
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Chapter 11 Configuring VLAN Trunks on Fast Ethernet and Gigabit Ethernet Ports Configuring a Trunk Link Note When you first configure a port as a trunk, the set trunk command always adds all VLANs to the allowed VLAN list for the trunk, even if you specify a VLAN range (any specified VLAN range is ignored). To modify the allowed VLANs list, use the clear trunk and set trunk commands to specify the allowed VLANs. To define the allowed VLAN list for a trunk port, perform this task in privileged mode: Step 1 Step 2 Step 3 Task Command (Optional) Add specific VLANs to the allowed VLANs list set trunk mod_num/port_num vlans for a trunk. Remove VLANs from the allowed VLANs list for a trunk. clear trunk mod_num/port_num vlans Verify the allowed VLAN list for the trunk. show trunk [mod_num/port_num] This example shows how to define the allowed VLANs list for trunk port 1/1 to allow VLANs 10, 20, and VLAN 100, and how to verify the allowed VLAN list for the trunk: Console> (enable) set trunk 1/1 10,20,100 Adding vlans 10, 20 to allowed list. Port(s) 1/1 allowed vlans modified to 10,20,100,1002,1003,1004,1005. Console> (enable) clear trunk 1/1 1-9,11-19,21-99,101-1001 Removing Vlan(s) 1-9,11-19,21-99,101-100 from allowed list. Port 1/1 allowed vlans modified to 10,20,100. Console> (enable) show trunk 1/1 Port Mode Encapsulation Status Native vlan 1/1 desirable dot1q trunking 1 Port Vlans allowed on trunk 1/1 1,10,20,100 Port Vlans allowed and active in management domain 1/1 1,10,20,100 Port Vlans in spanning tree forwarding state and not pruned 1/1 1,10,20,100 Console> (enable) Disabling a Trunk Port To explicitly turn off trunking on a port, perform this task in privileged mode: Step 1 Step 2 Task Turn off trunking on a port. Verify the trunking configuration. Command set trunk mod_num/port_num off show trunk [mod_num/port_num] 78-15486-01 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 11-7
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