Configuring The Native Vlan For Untagged Traffic - Cisco Catalyst 2950 Software Configuration Manual

Chapter 13 Configuring VLANs
Command
Step 3
switchport trunk pruning vlan {add |
except | none | remove} vlan-list
[,vlan[,vlan[,,,]]
Step 4 end
Step 5
show interfaces interface-id switchport Verify your entries in the Pruning VLANs Enabled field of the display.
Step 6
copy running-config startup-config
To return to the default pruning-eligible list of all VLANs, use the no switchport trunk pruning vlan
interface configuration command.

Configuring the Native VLAN for Untagged Traffic

A trunk port configured with 802.1Q tagging can receive both tagged and untagged traffic. By default,
the switch forwards untagged traffic in the native VLAN configured for the port. The native VLAN is
VLAN 1 by default.
Note The native VLAN can be assigned any VLAN ID; it is not dependent on the management VLAN.
For information about 802.1Q configuration issues, see the
section on page
Beginning in privileged EXEC mode, follow these steps to configure the native VLAN on an 802.1Q
trunk:
Command
Step 1
configure terminal
Step 2 interface interface-id
Step 3 switchport trunk native vlan vlan-id
Step 4
end
78-11380-04
Purpose
Configure the list of VLANs allowed to be pruned from the trunk. (See
the "VTP Pruning" section on page
For explanations about using the add, except, none, and remove
keywords, refer to the Catalyst 2950 Desktop Switch Command Reference
for this release.
Separate nonconsecutive VLAN IDs with a comma and no spaces; use a
hyphen to designate a range of IDs. Valid IDs are from 2 to 1001.
Extended-range VLANs (VLAN IDs 1006 to 4094) cannot be pruned.
VLANs that are pruning-ineligible receive flooded traffic.
The default list of VLANs allowed to be pruned contains VLANs 2 to
1001.
Return to privileged EXEC mode.
(Optional) Save your entries in the configuration file.
13-20.
Purpose
Enter global configuration mode.
Enter interface configuration mode, and define the interface that is
configured as the 802.1Q trunk.
Configure the VLAN that is sending and receiving untagged traffic
on the trunk port.
For vlan-id, the range is 1 to 4094 when the enhanced software image
is installed, and 1 to 1005 when the standard software image is
installed. Do not enter leading zeros.
Return to privileged EXEC mode.
14-4).
"802.1Q Configuration Considerations"
Catalyst 2950 Desktop Switch Software Configuration Guide
Configuring VLAN Trunks
13-25