Rrpp Configuration; Rrpp Overview; Background; Basic Concepts In Rrpp - HP A5120 EI Configuration Manual

RRPP configuration

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.
RRPP features fast topology convergence.

Background

Metropolitan area networks (MANs) and enterprise networks usually use the ring structure to improve
reliability. However, services will be interrupted if any node in the ring network fails. A ring network
usually uses Resilient Packet Ring (RPR) or Ethernet rings. RPR is high in cost because it needs dedicated
hardware. In contrast, Ethernet ring technology is more mature and economical, so it is increasingly
widely used in MANs and enterprise networks.
Both Spanning Tree Protocol (STP) and RRPP can eliminate Layer 2 loops. STP is mature. However, it takes
several seconds to converge. RRPP is an Ethernet ring-specific data link layer protocol, and it converges
faster than STP. Additionally, the convergence time of RRPP is independent of the number of nodes in the
Ethernet ring, so RRPP can be applied to large-diameter networks.

Basic concepts in RRPP

Figure 13 RRPP networking diagram
Master node
Transit node
RRPP domain
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.
Device A
Port 1
Port 2
Ring 1
Port 2
Device D
Port 2
Port 1
Domain 1
Device B
Edge node
Port 1
Port 3
Port 2
Ring 2
Port 1
Port 3
Device C
Assistant edge node
54
Port 1
Device E
Master node
Port 2