61Task RemarksConfiguring an RRPP ring groupOptional.Perform this task on the edge node and assistant-edge nodein the RRPP domain.NOTE:• RRPP does not have an auto election mechanism, so you must configure each node in the ring networkproperly for RRPP to monitor and protect the ring network.• Before configuring RRPP, you must construct a ring-shaped Ethernet topology physically.Creating an RRPP domainWhen creating an RRPP domain, specify a domain ID, which uniquely identifies an RRPP domain. Alldevices in the same RRPP domain must be configured with the same domain ID.Perform this configuration on devices you want to configure as nodes in the RRPP domain.To create an RRPP domain:Step Command1. Enter system view. system-view2. Create an RRPP domain, and enter RRPP domainview. rrpp domain domain-idConfiguring control VLANsBefore configuring RRPP rings in an RRPP domain, configure the same control VLANs for all nodes in theRRPP domain first. When configuring control VLANs for an RRPP domain, you only need to configure theprimary control VLAN. The system automatically configures the secondary control VLAN, and it uses theprimary control VLAN ID plus 1 as the secondary control VLAN ID. For the control VLAN configurationto succeed, make sure the IDs of the two control VLANs are consecutive and have not been assigned yet.Perform this configuration on all nodes in the RRPP domain to be configured.Configuration guidelines• To ensure proper forwarding of RRPPDUs, do not configure the default VLAN of a port accessing anRRPP ring as the control VLAN, or enable 802.1Q in 802.1Q (QinQ) on the control VLANs.• Before configuring RRPP rings for an RRPP domain, you can delete or modify the control VLANsconfigured for the RRPP domain. However, after configuring RRPP rings for an RRPP domain, youcannot delete or modify the control VLANs of the domain. You can only use the undo control-vlancommand to delete a control VLAN.• To transparently transmit RRPPDUs on a device not configured with RRPP, you must ensure only thetwo ports connecting the device to the RRPP ring permit the packets of the control VLANs. Otherwise,the packets from other VLANs may go into the control VLANs in transparent transmission mode andstrike the RRPP ring.