67Configuring RRPP portsPerform this configuration on each node’s ports intended for accessing RRPP rings.Follow these steps to configure RRPP ports:To do… Use the command… RemarksEnter system view system-view —Enter port view interface interface-typeinterface-number —Configure the link type of the portas trunk port link-type trunkRequiredBy default, the link type of a port isaccess.Assign the trunk port to theprotected VLANs of the RRPPdomainport trunk permit vlan { vlan-id-list| all }RequiredBy default, a trunk port allows onlypackets of VLAN 1 to pass throughDisable STP undo stp enable RequiredEnabled by defaultConfigure the port to trust the802.1p precedence of thereceived packetsqos trust dot1pRequiredBy default, the port priority istrusted.NOTE:• RRPP ports always allow packets of the control VLANs to pass through.• For more information about the port link-type trunk and port trunk permit vlan commands, see theLayer 2—LAN Switching Command Reference.• For more information about the undo stp enable command, see theLayer 2—LAN Switching CommandReference.• The 802.1p priority of trusted packets on the RRPP ports must be configured, so that RRPP packets takehigher precedence than data packets when passing through the RRPP ports. For more information aboutthe qos trust dot1p command, see theACL and QoS Command Reference.• Do not enable OAM remote loopback function on an RRPP port. Otherwise, it may cause temporarybroadcast storm.• Do not configure physical-link-state change suppression time on a port accessing an RRPP ring toaccelerate topology convergence. For more information, see the undo link-delay command (Layer2—LAN Switching Command Reference).Configuring RRPP nodesNOTE:• The maximum number of rings that can be configured on a device in all RRPP domains is 16.• If a device carries multiple RRPP rings in an RRPP domain, only one ring can be configured as theprimary ring on the device and the role of the device on a subring can only be an edge node or anassistant-edge node.