R3102-R3103-HP 6600/HSR6600 Routers High Availability Configuration Guide

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 Assistant-edge node—A node residing on both the primary ring and a subring at the same time.
An assistant-edge node is a special transit node that serves as a transit node on the primary ring
and an assistant-edge node on the subring. This node works in conjunction with the edge node
to detect the integrity of the primary ring and perform loop guard.
As shown in Figure 17, Ring 1 is the primary ring and Ring 2 is a subring. Device A is the master
node of Ring 1. Device B, Device C, and Device D are the transit nodes of Ring 1. Device E is the
master node of Ring 2, Device B is the edge node of Ring 2, and Device C is the assistant-edge node
of Ring 2.
Primary port and secondary port
Each master node or transit node has two ports connected to an RRPP ring, one serving as the primary
port and the other serving as the secondary port. You can determine the role of a port.
1. In terms of functionality, the primary port and the secondary port of a master node have the
following differences:
 The primary port and the secondary port are designed to play the role of sending and
receiving loop-detect packets, respectively.
 When an RRPP ring is in Health state, the secondary port of the master node will logically
deny data VLANs and permit only the packets from the control VLANs.
 When an RRPP ring is in Disconnect state, the secondary port of the master node will forward
packets from data VLANs.
2. In terms of functionality, the primary port and the secondary port of a transit node are the same.
Both are designed for transferring protocol packets and data packets over an RRPP ring.
As shown in Figure 17, Device A is the master node of Ring 1. Port 1 and Port 2 are the primary port
and the secondary port of the master node on Ring 1, respectively. Device B, Device C, and Device D
are the transit nodes of Ring 1. Their Port 1 and Port 2 are the primary port and the secondary port on
Ring 1, respectively.
Common port and edge port
The ports connecting the edge node and assistant-edge node to the primary ring are common ports.
The ports connecting the edge node and assistant-edge node only to the subrings are edge ports.
As shown in Figure 17, Device B and Device C lie on Ring 1 and Ring 2. Device B's Port 1 and Port 2
and Device C's Port 1 and Port 2 access the primary ring, so they are common ports. Device B's Port
3 and Device C's Port 3 access only the subring, so they are edge ports.
RRPP ring group
To reduce Edge-Hello traffic, you can configure a group of subrings on the edge node or
assistant-edge node. For more information about Edge-Hello packets, see "RRPPDUs." You must
configure a device as the edge node of these subrings, and another device as the assistant-edge node
of these subrings. Additionally, the subrings of the edge node and assistant-edge node must connect
to the same subring packet tunnels in major ring (SRPTs), so that Edge-Hello packets of the edge node
of these subrings travel to the assistant-edge node of these subrings over the same link.
An RRPP ring group configured on the edge node is an edge node RRPP ring group, and an RRPP ring
group configured on an assistant-edge node is an assistant-edge node RRPP ring group. Up to one
subring in an edge node RRPP ring group is allowed to send Edge-Hello packets.