Extreme Networks ExtremeWare XOS 11.1, Руководство пользователя

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ExtremeWare XOS 11.1 Concepts Guide
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15 Ethernet Automatic Protection Switching
This chapter covers the following topics:
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Licensing on page 267
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Overview of the EAPS Protocol on page 267
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Fault Detection and Recovery on page 269
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Multiple EAPS Domains on page 272
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Configuring EAPS on a Switch on page 274
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Configuring EAPS Shared Ports on page 282
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EAPS Shared Port Configuration Rules on page 289
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EAPS Shared Port Configuration Examples on page 289
Licensing
You must have a Core or 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
Advance Core license, respectively.
The Aspen 8810 switch ships 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:
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Switches can belong to only one EAPS ring.
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Multiple EAPS domains using two matching ring ports.
For more information about software licensing, including how to obtain and upgrade your license, see
Chapter 1 , “ ExtremeWare XOS Overview .”
Overview of the EAPS Protocol
The Ethernet Automatic Protection Switching (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 13 ).
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.