Configuring a tagged port to discard untagged frames

Configure a tagged port to discard all untagged packets so that the frame is not classified into the default VLAN for the port.

Procedure

  1. Enter GigabitEthernet Interface Configuration mode:

    enable

    configure terminal

    interface GigabitEthernet {slot/port[/sub-port][-slot/port[/sub-port]][,...]}

    Note

    Note

    If the platform supports channelization and the port is channelized, you must also specify the sub-port in the format slot/port/sub-port.

  2. Configure a tagged port to discard untagged frames:

    untagged-frames-discard [port {slot/port[/sub-port][-slot/port[/sub-port]][,...]}]

  3. Discard a tagged frame on an untagged port:

    tagged-frames-discard [port {slot/port[/sub-port][-slot/port[/sub-port]][,...]}] enable

  4. Untag the default VLAN on a tagged port:

    untag-port-default-vlan [port {slot/port[/sub-port][-slot/port[/sub-port]][,...]}] enable

Example

Configure a tagged port to discard untagged frames:

Switch(config-if)#untagged-frames-discard port 1/1

Discard a tagged frame on an untagged port:

Switch(config-if)#tagged-frames-discard port 1/1 enable

Untag the default VLAN on a tagged port:

Switch(config-if)#untag-port-default-vlan port 1/2 enable

Variable definitions

Use the data in the following table to use optional parameters with the untagged-frames-discard command.

Table 1. Variable definitions

Variable

Value

{slot/port[/sub-port][-slot/port[/sub-port]][,...]}

Identifies the slot and port in one of the following formats: a single slot and port (slot/port), a range of slots and ports (slot/port-slot/port), or a series of slots and ports (slot/port,slot/port,slot/port). If the platform supports channelization and the port is channelized, you must also specify the sub-port in the format slot/port/sub-port.
9036830-00 Rev AD