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  • Introduction
  • Transparent Layer-3 Redundancy

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  1. CCNA
  2. Routing

FHRP

First Hop Redundancy Protocol is designed to protect the default gateway used on a subnet by allowing 2 or more router to provide backup to that address

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Last updated 4 years ago

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Introduction

High availability is critical in most environments. In this example there is only gateway which is a single point of failure.

Using multiple routers of multi-layer switches can provide Layer 3 redundancy for the hosts, however this L3 redundancy must be TRANSPARENT (no multiple default-gateways) to the hosts

Transparent Layer-3 Redundancy

Cisco supports 3 FHRP's

  • HSRP (Hot Standby Routing Protocol)

  • VRRP (Virtual Router Redundancy Protocol)

  • GLBP (Gateway Load Balancing Protocol)