Configuring control word for a PW profile

Configuring control word for a pseudowire (PW) profile enables all PW packets to follow the same path over an MPLS network.

Before completing the following task, the PW profile on which control word is to be enabled must be configured. An example is provided at the end of this task that shows all the steps in order.

PW control word configuration enables all packets for a specific PW to follow the same path over the MPLS network supporting, for example, the optimal transport of Ethernet Protocol Data Units (PDUs) over the network.

Perform the following task to configure PW control word for a PW profile.

From privileged EXEC mode, enter global configuration mode.
```
device# configure terminal
```
Enter PW profile configuration mode
```
device(config)# pw-profile pw_example
```
Enable control word for the PW profile.
```
device(config-pw-profile-pw_example)# control-word
```
Note
When control word is enabled for a previously configured PW, control word capabilities between PE devices are activated only after LDP neighbors are cleared by using the clear mpls ldp neighbor command. For further information on clearing LDP neighbors, refer to Extreme SLX-OS MPLS Configuration Guide.

Example

The following example shows how to configure a PW profile and enable control word for the profile. It then shows how to attach the PW profile to a bridge domain.

device# device# configure terminal
device(config)# pw-profile pw_example
device(config-pw-pw_example)# vc-mode tag
device(config-pw-pw_example)# mtu 1300
device(config-pw-pw_example)# mtu-enforce true
device(config-pw-pw_example)# control-word
device(config-pw-pw_example)# exit
!
device(config)# bridge-domain 502
device(config-bridge-domain-502)# pw-profile pw_example