Chapter 8: High Availability And Load Balancing; High Availability - Extreme Networks AG200 User Manual
Version 5.0
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Also See for AG200:
- Installation manual (80 pages) ,
- Hardware installation manual (40 pages) ,
- Hardware quick start manual (2 pages)
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8
High Availability and Load Balancing
High Availability
High availability occurs when one or more ESs takes over for an ES that has become unavailable in a
multiple-server installation.
Once an ES becomes unavailable, the other ESs take over enforcement from the ES that is now
unavailable. All ESs participate in enforcement. The MS provides notification in the console at the top of
the Home window. For example, if an ES is unavailable, the notification indicates that at the top of the
Home window.
When Sentriant AG is installed inline in a multiple-server configuration
(Figure
111), the multiple ESs
form a network loop (an undesired condition). The Spanning Tree Protocol (STP) detects the loop and
closes one of the offending ports on the switch based on the switch configuration. If an ES becomes
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Sentriant AG Users' Guide, Version 5.0
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