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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 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):

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  • First-hop redundancy protocol (en)
  • First-hop redundancy protocol (ja)
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  • ファーストホップ冗長プロトコル（First-hop redundancy protocol）とは、クライアントPCから最初に到達するネットワーク機器を冗長化するためのプロトコルである。 これにより、クライアントPCがインターネットなどの外部に接続するときに最初に通信するデフォルトゲートウェイ機器が故障しても、別のファーストホップが通信処理をする。 これを実現するには、仮想IPアドレスと仮想MACアドレスをデフォルトゲートウェイ（ルータ）に設定する。 ファーストホップ冗長プロトコルはいくつかの種類がある。以下にそれらプロトコル名と特徴を列挙する。 (ja)
  • 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 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): (en)
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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 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 developed in 1998 * Virtual Router Redundancy Protocol (VRRP) - an open (albeit patent encumbered) standard protocol * Common Address Redundancy Protocol (CARP) - patent-free unencumbered alternative to Cisco's HSRP developed in October 2003 * (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 * (NSRP) - a Juniper Networks proprietary router redundancy protocol providing load balancing * - a Juniper Networks proprietary Ethernet redundancy protocol, used on its SRX platform * (MAGP) - a Mellanox proprietary protocol based on VRRP that allows active-active operation (en)
  • ファーストホップ冗長プロトコル（First-hop redundancy protocol）とは、クライアントPCから最初に到達するネットワーク機器を冗長化するためのプロトコルである。 これにより、クライアントPCがインターネットなどの外部に接続するときに最初に通信するデフォルトゲートウェイ機器が故障しても、別のファーストホップが通信処理をする。 これを実現するには、仮想IPアドレスと仮想MACアドレスをデフォルトゲートウェイ（ルータ）に設定する。 ファーストホップ冗長プロトコルはいくつかの種類がある。以下にそれらプロトコル名と特徴を列挙する。 (ja)
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