Cisco Catalyst 4500 Series - Page 382

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Software Configuration Guide—Release IOS XE 3.6.0SG and IOS 15.2(2)SG
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Chapter 7 Configuring the Cisco IOS XE In Service Software Upgrade Process
Cisco High Availability Features in Cisco IOS XE 3.1.0SG
Enhanced High System Availability
http://www.cisco.com/en/US/docs/ios-xml/ios/ha/configuration/xe-3s/ha-config-stateful-switchover.ht
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