HP A5120 EI Configuration Manual page 92

 Use the display rrpp brief command to check whether the domain ID and primary control VLAN ID
are the same for all nodes. If they are not, set the same domain ID and primary control VLAN ID for
the nodes.
Use the display rrpp verbose command to check the link state of each port in each ring.

Use the debugging rrpp command on each node to check whether a port receives or transmits Hello

packets. If it does not, Hello packets are lost.
87