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A ''First Hop Redundancy Protocol (FHRP)'' is a computer networking protocol which is designed to protect the default gateway used on a subnetwork by allowing two or more routers to provide backup for that address; in the event of failure of the/an active router, the backup router will take over the address, usually within a few seconds. In practice, such protocols can also be used to protect other services operating on a single IP address, not just routers. Examples of such protocols include (in approximate order of creation): * Hot Standby Router Protocol (HSRP) - Cisco's initial, proprietary standard * Virtual Router Redundancy Protocol (VRRP) - an open standard protocol * Common Address Redundancy Protocol (CARP) - free, (patent) unencumbered alternative to Cisco's HSRP * Extreme Standby Router Protocol (ESRP) - Extreme Networks' proprietary standard with fast failover and also layer 2 protection * Gateway Load Balancing Protocol (GLBP) - a more recent proprietary standard from Cisco that permits load balancing as well as redundancy * Routed Split multi-link trunking (R-SMLT) - an Avaya redundancy protocol * NetScreen Redundancy Protocol (NSRP) - a Juniper Networks proprietary router redundancy protocol providing load balancing 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「First-hop redundancy protocols」の詳細全文を読む スポンサード リンク
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