5-6
Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
OL-8978-04
Chapter 5 Configuring Ethernet VLAN Trunks
Configuring a Trunk Link
• Defining the Allowed VLANs on a Trunk, page 5-8
• Disabling a Trunk Port, page 5-9
• Disabling VLAN 1 on Trunks, page 5-10
• Enabling 802.1Q Tagging of Native VLAN Traffic, page 5-11
• Disabling 802.1Q Tagging on Specific Ports, page 5-11
• Specifying a Custom 802.1Q EtherType Field, page 5-12
• Returning a Custom 802.1Q EtherType Field to the Standard EtherType, page 5-13
Configuring an ISL Trunk
To configure an ISL trunk, perform this task in privileged mode:
This example shows how to configure a port as a trunk and verify the trunk configuration. This example
assumes that the neighboring port is in auto mode:
Console> (enable) set trunk 1/1 on
Port(s) 1/1 trunk mode set to on.
Console> (enable) 06/16/1998,22:16:39:DTP-5:Port 1/1 has become isl trunk
06/16/1998,22:16:40:PAGP-5:Port 1/1 left bridge port 1/1.
06/16/1998,22:16:40:PAGP-5:Port 1/1 joined bridge port 1/1.
Console> (enable) show trunk
Port Mode Encapsulation Status Native vlan
-------- ----------- ------------- ------------ -----------
1/1 on isl trunking 1
Port Vlans allowed on trunk
-------- ---------------------------------------------------------------------
1/1 1-1005, 1025-4094
Port Vlans allowed and active in management domain
-------- ---------------------------------------------------------------------
1/1 1,521-524
Port Vlans in spanning tree forwarding state and not pruned
-------- ---------------------------------------------------------------------
1/1
Console> (enable)
This example shows how to place a port in desirable mode and verify the trunk configuration. This
example assumes that the neighboring port is in auto mode:
Console> (enable) set trunk 1/2 desirable
Port(s) 1/2 trunk mode set to desirable.
Console> (enable) 06/16/1998,22:20:16:DTP-5:Port 1/2 has become isl trunk
06/16/1998,22:20:16:PAGP-5:Port 1/2 left bridge port 1/2.
06/16/1998,22:20:16:PAGP-5:Port 1/2 joined bridge port 1/2.
Task Command
Step 1
Configure an ISL trunk. set trunk mod/port [on | off | desirable | auto |
nonegotiate] isl
Step 2
Verify the trunking configuration. show trunk [mod/port]
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