R3303-HP HSR6800 Routers High Availability Configuration Guide

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Configuring RRPP
The router supports RRPP only when the SAP module is operating in bridge mode.
RRPP overview
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, and rapidly restore the
communication paths between the nodes in the event that a link is disconnected on the ring.
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
usually 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.
Rapid Spanning Tree Protocol (RSTP), Per VLAN Spanning Tree (PVST), Multiple Spanning Tree Protocol
(MSTP), and RRPP can eliminate Layer-2 loops. RSTP, PVST, and MSTP are mature, but they take several
seconds to converge. RRPP is an Ethernet ring-specific data link layer protocol, and converges faster than
RSTP, PVST, and MSTP. Additionally, the convergence time of RRPP is independent of the number of
nodes in the Ethernet ring. RRPP can be applied to large-diameter networks.
Basic RRPP concepts
Figure 17 RRPP networking diagram
RRPP domain
The interconnected devices with the same domain ID and control VLANs constitute an RRPP domain. An
RRPP domain contains the following elements—primary ring, subring, control VLAN, master node, transit
node, primary port, secondary port, common port, edge port, and so on.
As shown in Figure 17, Do
main 1 is an RRPP domain, including two RRPP rings: Ring 1 and Ring 2. All
the nodes on the two RRPP rings belong to the RRPP domain.