An ERP instance is not enabled by default.
ERP configuration mode
Within an interconnected ring topology, in the major ring, you must first configure two interfaces. In a sub-ring, you must configure at least one interface before enabling the ERP instance.
Note
You must enable the major ring before enabling any sub-rings attached to the major ring (whose ERP ID is configured as parent-ring-id). Conversely, this order must be followed in reverse to disable an ERP instance.Use the no form of this command to deactivate the ERP instance.
The following example configures a non-RPL node in a major ring.
device# configure terminal device(config)# erp 1 device(config-erp-1)# right-interface vlan 2 e 1/2 device(config-erp-1)# left-interface vlan 2 e 1/1 device(config-erp-1)# enable