Each ring needs to have one RPL owner for each ring. The RPL owner‘s role is to block traffic on one port when no failure exists in the ring. The blocked port will be the left interface that you initially configured. After configuring the ERN to be the RPL owner, by means of the rpl-owner command, you next must set the RPL, by means of the rpl vlan command.
The following example illustrates assigning the RPL owner role and setting the RPL.
device# configure terminal device(config)# erp 1 device(config-erp-1)# rpl-owner device(config-erp-1)# rpl vlan 5 ethernet 0/1