Configuring a nondefault TPID

Perform the following steps to configure a nondefault TPID. The interface can be a port or a port-channel (LAG).

Do the following to configure a nondefault TPID on an Ethernet interface.

Enter global configuration mode.
```
device# configuration terminal
```
Enter interface configuration mode and specify an Ethernet interface.
```
device(config)# interface ethernet 0/1
```
Use the tag-type command to configure the TPID.
```
device(conf-if-eth-0/1)# tag-type 0x9100 
```
By default, all interfaces in the system have default TPID value of 0x8100.

Enter the show interface ethernet command to confirm the configuration.

device# show interface ethernet 0/1
Ethernet 0/1 is up, line protocol is up (connected)
Hardware is Ethernet, address is 609c.9f5f.5005
    Current address is 609c.9f5f.5005
Pluggable media present
Interface index (ifindex) is 203431936
MTU 1548 bytes
10G Interface
LineSpeed Actual     : 1000 Mbit
LineSpeed Configured : Auto, Duplex: Full
Tag-type: 0x9100
Priority Tag disable
Forward LACP PDU: Disable
Route Only: Disabled
Last clearing of show interface counters: 23:12:47
Queueing strategy: fifo
Receive Statistics:
    0 packets, 0 bytes
    Unicasts: 0, Multicasts: 0, Broadcasts: 0
    64-byte pkts: 0, Over 64-byte pkts: 0, Over 127-byte pkts: 0
    Over 255-byte pkts: 0, Over 511-byte pkts: 0, Over 1023-byte pkts: 0
    Over 1518-byte pkts(Jumbo): 0
    Runts: 0, Jabbers: 0, CRC: 0, Overruns: 0
    Errors: 0, Discards: 0
Transmit Statistics:
    0 packets, 0 bytes
    Unicasts: 0, Multicasts: 0, Broadcasts: 0
    Underruns: 0
    Errors: 0, Discards: 0
Rate info:
    Input 0.000000 Mbits/sec, 0 packets/sec, 0.00% of line-rate
    Output 0.000000 Mbits/sec, 0 packets/sec, 0.00% of line-rate
Route-Only Packets Dropped: 0
Time since last interface status change: 23:12:45

To revert to the default TPID value, enter the no tag-type command.
```
device(conf-if-eth-0/1)# no tag-type 
```

You can achieve the same result by configuring a tag-type of 0x8100.

Do the following to configure a nondefault TPID on a port-channel interface.

Enter global configuration mode.
```
device# configuration terminal
```
Enter interface configuration mode and specify a port-channel interface.
```
device(config)# interface port-channel 20
```
Use the tag-type command to configure the TPID.
```
device(config-Port-channel-20)# tag-type 0x88a8 
```
By default, all interfaces in the system have default TPID value of 0x8100.

Enter the show interface port-channel command to confirm the configuration.

device# show interface port-channel 20
Port-channel 20 is up, line protocol is up
Hardware is AGGREGATE, address is 609c.9f5c.ac07
    Current address is 609c.9f5c.ac07
Interface index (ifindex) is 671088660 (0x28000014)
Minimum number of links to bring Port-channel up is 1
MTU 1548 bytes
LineSpeed Actual     : 300000 Mbit
Allowed Member Speed : 100000 Mbit
Priority Tag disable
Forward LACP PDU: Disable
Route Only: Disabled
Tag-type: 0x88a8
Last clearing of show interface counters: 2d01h50m
Queueing strategy: fifo
Receive Statistics:
    34579 packets, 4201368 bytes
    Unicasts: 0, Multicasts: 34579, Broadcasts: 0
    64-byte pkts: 0, Over 64-byte pkts: 17288, Over 127-byte pkts: 17291
    Over 255-byte pkts: 0, Over 511-byte pkts: 0, Over 1023-byte pkts: 0
    Over 1518-byte pkts(Jumbo): 0
    Runts: 0, Jabbers: 0, CRC: 0, Overruns: 0
    Errors: 0, Discards: 0
Transmit Statistics:
    34578 packets, 4201240 bytes
    Unicasts: 0, Multicasts: 34578, Broadcasts: 0
    Underruns: 0
    Errors: 0, Discards: 0
Rate info:
    Input 0.000000 Mbits/sec, 0 packets/sec, 0.00% of line-rate
    Output 0.000000 Mbits/sec, 0 packets/sec, 0.00% of line-rate
Route-Only Packets Dropped: 0
Time since last interface status change: 1d23h59m