The following table compares and contrasts the various capabilities and parameters of multiple First Hop Redundancy Protocols.

2016年2月16日 · Feature Information for FHRP - HSRP Multiple Group Optimization. The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train.

First Hop Redundancy Protocol (FHRP) is a hop redundancy protocol that is designed to provide redundancy to the gateway router within the organization’s network by the use of a virtual IP address and virtual MAC address. To implement FHRP, there should be two or more routers that will be used as a gateway router.

2023年7月3日 · 第一跳冗余协议（First Hop Redundancy Protocol，FHRP）是一种网络协议，用于提供在默认网关故障时的备用路由。 本文将详细介绍三种常见的第一跳冗余协议：HSRP（Hot Standby Router Protocol）、VRRP（Virtual Router Redundancy Protocol）和GLBP（Gateway Load Balancing Protocol）。

What is an FHRP? FHRPs allow two or more physical devices to operate as redundant default gateways. If one physical device fails, the other takes over, and the hosts are none the wiser. The key to FHRPs is that they create what is known as a “virtual IP address” that is used as the address of the default gateway on the hosts.

2016年2月16日 · The HSRP is an FHRP designed to allow for transparent failover of the first-hop IP device. HSRP provides high network availability by providing first-hop routing redundancy for IP hosts on Ethernet configured with a default gateway IP address.

That mechanism is provided by first hop redundancy protocols (FHRPs). In a switched network, each client receives only one default gateway. There is no way to use a secondary gateway, even if a second path exists to carry packets off the local segment. In the figure, R1 is responsible for routing packets from PC1.

Table 16-2 lists the three FHRP protocols in chronological order as first used in the market. Cisco first introduced the proprietary Hot Standby Router Protocol (HSRP), which worked well for many customers. Later, the IETF developed an RFC for a similar protocol, Virtual Router Redundancy Protocol (VRRP).

HSRP provides high network availability by providing first-hop routing redundancy for IP hosts on networks configured with a default gateway IP address. HSRP is used in a group of routers for selecting an active device and a standby device.

2024年4月16日 · The FHRP (First Hop Redundancy Protocols) section covers state analysis of HSRP and VRRP protocols. Redundancy protocols are not fully state-aware due to a limited two-way handshake, resulting in undesired active/active or down/standby scenarios when unidirectional links are present and traffic black-holing. Thanks for your feedback!