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Configuring a Trunk Link
To disable the forwarding of 802.1Q tagged frames on specific ports, perform this task in privileged
mode:
Task
Step 1
Enable or disable the forwarding of 802.1Q
tagged frames on specific ports or on all ports.
Step 2
Verify the configuration.
This example shows how to disable the forwarding of 802.1Q tagged frames on port 3/2 and verify the
configuration:
Console> (enable) set port dot1q-all-tagged 3/2 disable
Packets on native vlan will not be tagged on port
Console> (enable) show port dot1q-all-tagged
Dot1q-all-tagged feature globally enabled.
Port
----
2/1
2/2
3/1
3/2
3/3
3/4
3/5
<output truncated>
Specifying a Custom 802.1Q EtherType Field
A custom 802.1Q EtherType field is supported only on the following modules: Supervisor Engine 2,
Note
Supervisor Engine 720, and Supervisor Engine 32 uplink ports, WS-X6516-GBIC, WS-X6516A-GBIC,
WS-X6516-GE-TX, WS-X6148-GE-TX, WS-X6148V-GE-TX, WS-X6548-GE-TX, WS-X6548V-GE-TX,
WS-X6748-GE-TX, WS-X6724-SFP, WS-X6704-10GE, and WS-X6501-10GEX4.
A custom 802.1Q EtherType field is not supported on EtherChannels. If you configure a port with a custom
Note
802.1Q EtherType field, the port cannot join a channel. If a channel is already configured, you cannot change
the 802.1Q EtherType on any of the channel ports.
On the WS-X6516A-GBIC, WS-X6516-GBIC, and WS-X6548-GE-TX modules, if you configure a port with
Note
a custom 802.1Q EtherType in the port groups 1 through 8 or 9 through 16, all the ports in the group are
configured with the custom 802.1Q EtherType. On the WS-X6516-GE-TX module, if you configure a port
with a custom 802.1Q EtherType in the port groups 1 through 4, 5 through 8, 9 through 12, or 13 through 16,
all the ports in the group are configured with the custom 802.1Q EtherType.
Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
5-12
Dot1q-all-tagged mode
---------------------
enable
enable
enable
disable
enable
enable
enable
Chapter 5
Configuring Ethernet VLAN Trunks
Command
set port dot1q-all-tagged mod/port enable |
disable
show port dot1q-all-tagged
3/2.
OL-8978-04
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Troubleshooting
