Extreme Networks Summit Summit24, Installation And User Manual

Page: 119 / 244

Summit24e3 Switch Installation and User Guide 119
11
Ethernet Automatic Protection Switching
This chapter describes the use of the Ethernet Automatic Protection Switching (EAPS
™
) protocol, and
includes information on the following topics:
• Overview of the EAPS Protocol on page 119
• Commands for Configuring and Monitoring EAPS on page 123
Overview of the EAPS Protocol
The EAPS protocol provides fast protection switching to Layer 2 switches interconnected in an Ethernet
ring topology, such as a Metropolitan Area Network (MAN) or large campuses (see Figure 21).
EAPS protection switching is similar to what can be achieved with the Spanning Tree Protocol (STP),
but offers the advantage of converging in less than a second when a link in the ring breaks.
In order to use EAPS, you must enable EDP on the switch. For more information on EDP, refer to
Chapter 6.
EAPS operates by declaring an EAPS domain on a single ring. Any VLAN that warrants fault protection
is configured on all ring ports in the ring, and is then assigned to an EAPS domain. On that ring
domain, one switch, or node, is designated the master node (see Figure 22), while all other nodes are
designated as transit nodes.