User's Manual

Table Of Contents
268
Users Manual of CS-6306R
Chapter 26. EAPS Configuration
Introduction of Fast Ethernet Ring Protection 26.1
26.1.1 Overview
The Ethernet ring protection protocol is a special type of link-layer protocol specially designed for constructing
the ring Ethernet topology. The Ethernet protection protocol can shut down one link in a complete ring
topology, preventing the data loop from forming the broadcast storm. If a link is broken, the protocol
immediately resumes the link that is previously shut down. In this way, the nodes among the ring network can
communicate with each other.
The ring protection protocol and STP are both used for topology control on the link layer. STP is suitable for all
kinds of complicated networks, which transmits the change of network topology hop by hop. The ring
protection protocol is used for ring topology and adopts the pervasion mechanism to transmit the change of
network topology. Therefore, the convergence of the ring protection protocol in the ring network is better than
STP. In a sound network, the ring protection protocol can resume network communication within less than
50ms.
Remark:
EAPS supports to set a switch to be a node of multiple physical ring to construct complicated topology.
26.1.2 Related Concepts of Fast Ether-Ring Protection
Figure 1.1 EAPS Ethernet ring