First Hop Redundancy Protocols Configuration Guide, Cisco IOS XE Release 3S - Configuring HSRP [Cisco IOS XE 3S] - Cisco
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Cisco Training Online - Basic Information of Configuring HSRP on a Cisco Router: Hot Standby Routing Protocol or HSRP, is a Cisco proprietary protocol that allows two or more routers to work
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HSRP Overview And Basic Configuration - Cisco Community