tag-type

Configures Tag Protocol ID (TPID) for the specified interface.

Syntax

tag-type tp-id

no tag-type tp-id

Parameter:

tp-id: Specifies the TPID. TPID is a numerical value in hexadecimal format. Some of the TPIDs supported are 0x8100, 0x9100, 0x9200, 0x88a8.

Command Default

The default TPID value is 0x8100.

Modes

Interface configuration mode

Usage Guidelines

The interface can be a port or a port-channel (LAG).

Use the no form of the command to revert to the default TPID value.

The TPID feature has the following limitations:

AVT profile limitation: Because of the limited number of AVT profiles (ingress and egress), the support for TPID configuration is available for the outer TPID of the packet without reducing the number of AVT profiles. When a packet is dual tagged, the inner TPID that is supported and recognized is TPID 0x8100.
System maximum TPID: Hardware allows up to only four TPID configurations. The TPID can be any user-defined value. However, the inner TPID for a dual-tagged packet must be 0x8100, which means you can configure only three additional TPIDs in a system . TPID 0x8100 is the default value for all interfaces until you change it by means of the tag-type command.

For the SLX 9740/Extreme 8820 series devices, only two (2) TPIDs are supported, which include the default TPID. Therefore, only one additional TPID is available for user configuration.
LSP FRR limitation: Hardware support for LSP FRR is available only for TPID 0x8100. If you require a label switched path with fast reroute (LSP FRR) configuration, note that none of the routable interfaces (whether a router port or a LIF of a VE) can have any nondefault TPID configuration, because FRR always assumes that the link layer has the default TPID of 0x8100.

Note

The LSP FRR limitation is for any tag-type configured in the device. You can configure either FRR or tag-type on any interface in the device, as in this example.

device(config-router-mpls-lsp-to-avalanche-1)# frr
%Error: Not allowed, when a non-default TPID (tag-type) is configured on any port-channel or physical interfaces.
device(config-router-mpls-lsp-to-avalanche-1)#

Important

When the tag type is changed on interface, the interface is brought down first, causing all learned MAC addresses to be flushed.

Examples

This example shows how to configure a nondefault TPID on an Ethernet interface.

device# configure terminal
device(config)# inteface ethernet 1/1
device(conf-if-eth-1/1)# tag-type 0x9100

This example shows how to revert to the default TPID value.

device# configure terminal
device(config)# inteface ethernet 1/1
device(conf-if-eth-1/1)# no tag-type

This example shows how to configure a nondefault TPID on a port-channel interface.

device# configure terminal
device(config)# inteface port-channel 10
device(config-Port-channel-10)# tag-type 0x88a8