To update the attributes of a listener, use the neutron lbaas-listener-update command shown here:

neutron lbaas-listener-update
[--description DESCRIPTION]
[--connection-limit CONNECTION_LIMIT]
[--default-pool DEFAULT_POOL]
[--name NAME]
[--admin-state-up {True,False}]
LISTENER 

The --description argument is optional and can be used to update the description of the listener.

The --connection-limit argument is optional and can be used to update the connection limit.

The --default-pool argument is optional and can be used to update the default pool of the listener.

The --name argument is option and can be used to set a name for the listener.

The --admin-state-up argument is optional and can be used to set the listener's state.

The LISTENER argument specifies the name or ID or the listener to update.