Overview Of Rrpp; Rrpp Features Supported By The S3700 - Huawei Quidway S3700 Series Configuration Manual

Quidway S3700 Series Ethernet Switches
Configuration Guide - Reliability

3.1 Overview of RRPP

RRPP is a link layer protocol applied to an Ethernet ring. RRPP features fast convergence and
can prevent broadcast storms caused by data loops.
For most LANs, the ring network is adopted to provide high reliability. A fault of any single
node on the ring, however, affects the service. In general, the technology of the ring network is
the Resilient Packet Ring (RPR) or Ethernet ring. A special hardware is required to adopt RPR,
which increases the costs. Therefore, increasing number of LANs are moving towards adopting
the Ethernet ring as it is technologically advanced and the costs involved are comparatively less.
The RSTP/MSTP and Rapid Ring Protection Protocol (RRPP) are generally adopted to address
the Layer 2 network loop. RSTP/MSTP is highly adaptable; however, the convergence time is
measured in seconds.
RRPP is a link layer protocol used for Ethernet rings. RRPP can prevent broadcast storms caused
by data loops on a complete Ethernet ring. When a link on the Ethernet ring fails, nodes on the
ring can restore communication immediately through the backup link.
Compared with other Ethernet ring technologies, RRPP has the following features:
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3.2 RRPP Features Supported by the S3700

This section describes the RRPP features supported by the S3700.
Basic RRPP Functions
The concepts of RRPP are described based on
Issue 01 (2011-10-26)
Convergence time is not related to the number of nodes on a ring network. Thus, RRPP
can be applied to a large-scale network.
RRPP can prevent broadcast storm caused by loops when an Ethernet ring network is
complete.
On an Ethernet ring network, when a link is disconnected, a backup link immediately
resumes the normal communication between nodes.
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Figure 3-1.
3 RRPP Configuration
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