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Chapter 5
Configuring Ethernet VLAN Trunks
Enabling 802.1Q Tagging of Native VLAN Traffic
The set dot1q-all-tagged enable command is a global command that configures a switch to forward all
frames from 802.1Q trunks with 802.1Q tagging in the native VLAN, and admit only 802.1Q tagged
frames on 802.1Q trunks, dropping any untagged traffic, including untagged traffic in the native VLAN.
You can enter this command on any switch that needs to support 802.1Q tunneling with 802.1Q trunks.
To configure the switch to forward all 802.1Q tagged frames on 802.1Q trunks, perform this task in
privileged mode:
Task
Step 1
Enable the switch to forward all 802.1Q tagged
frames.
Step 2
Verify the configuration.
This example shows how to enable the switch to forward all 802.1Q traffic and verify the configuration:
Console> (enable) set dot1q-all-tagged enable
Dot1q-all-tagged feature enabled globally.
Console> (enable) show dot1q-all-tagged
Dot1q-all-tagged feature globally enabled.
Console> (enable)
Disabling 802.1Q Tagging on Specific Ports
The set port dot1q-all-tagged mod/port enable | disable command allows you to disable 802.1Q
tagging on specific ports. Enter the set port dot1q-all-tagged disable command to selectively disable
802.1Q tagging on ports that connect to the devices that do not support 802.1Q tagged traffic. If you
enable or disable 802.1Q tagging on an EtherChannel port, the configuration is applied to all ports in the
channel.
Note
If you did not enter the global set dot1q-all-tagged enable command, the default group is never tagged
and the per-port setting has no effect.
If you entered the global set dot1q-all-tagged enable command, the per-port setting controls whether
frames are tagged.
The set port dot1q-all-tagged mod/port enable | disable command is not supported on the ports on the
Note
MSFC or ports on the WS-X6101 OC-12 ATM modules.
OL-8978-04
Command
set dot1q-all-tagged [enable | disable]
show dot1q-all-tagged
Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
Configuring a Trunk Link
5-11
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Troubleshooting
