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Configuring RRPP
Overview
Metropolitan area networks (MANs) and enterprise networks typically use the ring topology to
improve reliability. However, services will be interrupted if any node in the ring network fails. A ring
network typically uses RPR or Ethernet rings. RPR is high in cost because it needs dedicated
hardware. In contrast, the Ethernet ring technology is more mature and economical, so it is more and
more popular in MANs and enterprise networks.
The Rapid Ring Protection Protocol (RRPP) is a link layer protocol designed for Ethernet rings.
RRPP can prevent broadcast storms caused by data loops when an Ethernet ring is healthy. RRPP
can also rapidly restore the communication paths between the nodes when a link is disconnected on
the ring. The convergence time of RRPP is independent of the number of nodes in the Ethernet ring.
RRPP is applicable to large-diameter networks.
Basic RRPP concepts
Figure 12 shows a typical RRPP network with two Ethernet rings and multiple nodes. RRPP detects
ring status and sends topology change information by exchanging Rapid Ring Protection Protocol
Data Units (RRPPDUs) among the nodes.
Figure 12 RRPP networking diagram
RRPP domain
An RRPP domain is uniquely identified by a domain ID. The interconnected devices with the same
domain ID and control VLANs constitute an RRPP domain. An RRPP domain contains the following
elements:
• Primary ring and subring.
• Control VLAN.
• Master node, transit node, edge node, and assistant edge node.
• Primary port, secondary port, common port, and edge port.
As shown in Figure 12, Do
main 1 is an RRPP domain, containing two RRPP rings: Ring 1 and Ring
2. All the nodes on the two RRPP rings belong to the RRPP domain.
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