Chapter 19: Ethernet Automatic Protection Switching; Licensing; Overview Of The Eaps Protocol - Extreme Networks ExtremeWare XOS Guide Manual

19 Ethernet Automatic Protection Switching
This chapter covers the following topics:
Licensing on page 395
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Overview of the EAPS Protocol on page 395
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Fault Detection and Recovery on page 397
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Multiple EAPS Domains on page 400
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Configuring EAPS on a Switch on page 403
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Configuring EAPS Shared Ports on page 411
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EAPS Shared Port Configuration Rules on page 418
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EAPS Shared Port Configuration Examples on page 419
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Licensing

You must have a Core or an Advanced Core license to configure and use all of the Ethernet Automatic
Protection Switching (EAPS) features described in this chapter.
The BlackDiamond 10K switch with an MSM-1 module or an MSM1-XL module ships with a Core or
Advanced Core license, respectively.
The BlackDiamond 8800 family of switches (formerly known as Aspen) and the Summit X450 switch
ship with an Advanced Edge license. To use the complete EAPS functionality, including running two or
more EAPS rings, having a switch belonging to multiple EAPS rings, or configuring shared-ports that
allow multiple EAPS domains to share a common link, you must have a Core software license.
A subset of EAPS, called EAPS Edgemode, is available with an Advanced Edge license and supports a
subset of EAPS. The following features are available with EAPS Edgemode:
Switches can belong to only one EAPS ring.
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Multiple EAPS domains using two matching ring ports.
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For more information about software licensing, including how to obtain and upgrade your license, see
Chapter 1, "ExtremeWare XOS

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
EAPS protection switching is similar to what can be achieved with the Spanning Tree Protocol (STP),
but EAPS offers the advantage of converging in less than 1 second when a link in the ring breaks.
ExtremeWare XOS 11.3 Concepts Guide
Overview."
Figure 17).
395