Cisco WS-C2960-24TC-S-RF Software Guide - Page 236
Defining the Allowed VLANs on a Trunk
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Configuring a Trunk Link Chapter 11 Configuring VLAN Trunks on Fast Ethernet and Gigabit Ethernet Ports Before configuring an 802.1Q trunk you must set a VTP domain and enter the VLANs that will be used in the trunk or channel. For more information see Chapter 9, "Configuring VTP," and Chapter 10, "Configuring VLANs." To configure an 802.1Q trunk, perform this task in privileged mode: Step 1 Step 2 Step 3 Task Define the VTP domain name. Configure VLANs. Configure an 802.1Q trunk. Step 4 Verify the trunking configuration. Command set vtp domain name set vlan vlan set trunk mod_num/port_num [on | desirable | auto | nonegotiate] dot1q show trunk [mod_num/port_num] This example shows how to configure an 802.1Q trunk and how to verify the trunk configuration: Console> (enable) set vtp domain Lab_Network VTP domain Lab_Network modified Console> (enable) set vlan 10,20,100 VTP advertisements transmitting temporarily stopped, and will resume after the command finishes. Vlan 10,20,100 configuration successful. Console> (enable) set trunk 2/9 desirable dot1q Port(s) 2/9 trunk mode set to desirable. Port(s) 2/9 trunk type set to dot1q. Console> (enable) 07/02/1998,18:22:25:DTP-5:Port 2/9 has become dot1q trunk Console> (enable) show trunk Port Mode Encapsulation 2/9 desirable dot1q Status -----------trunking Native vlan ----------1 Port Vlans allowed on trunk 2/9 1,10,20,100 Port Vlans allowed and active in management domain 2/9 1,10,20,100 Port Vlans in spanning tree forwarding state and not pruned 2/9 1,10,20,100 Console> (enable) Defining the Allowed VLANs on a Trunk When you configure a trunk port, all VLANs are added to the allowed VLANs list for that trunk. However, you can remove VLANs from the allowed list to prevent traffic for those VLANs from passing over the trunk. 11-6 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 78-15486-01
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