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Configuring a Trunk Link
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Configuring an ISL Trunk
To configure an ISL trunk, perform this task in privileged mode:
Task
Step 1
Configure an ISL trunk.
Step 2
Verify the trunking configuration.
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
--------
1/1
Port
--------
1/1
Port
--------
1/1
Port
--------
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.
Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
5-6
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
Mode
Encapsulation
-----------
-------------
on
isl
Vlans allowed on trunk
---------------------------------------------------------------------
1-1005, 1025-4094
Vlans allowed and active in management domain
---------------------------------------------------------------------
1,521-524
Vlans in spanning tree forwarding state and not pruned
---------------------------------------------------------------------
Chapter 5
Command
set trunk mod/port [on | off | desirable | auto |
nonegotiate] isl
show trunk [mod/port]
Status
Native vlan
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-----------
trunking
1
Configuring Ethernet VLAN Trunks
OL-8978-04
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