R3102-R3103-HP 6600/HSR6600 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. The router that uses
RPE-X1 as the MPU does not support RRPP.
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
Device A
Master node
Device D
Transit node
Domain 1
Ring 1
Port 2
Port 1
Port 2
Port 1
Port 2
Port 1
Port 2
Port 1
Device C
Assistant edge node
Device B
Edge node
Ring 2
Port 3
Port 3
Port 1
Port 2
Device E
Master node