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Introduction to VRRP

Latest reply: Sep 23, 2018 07:00:50 671 3 1 0 0


VRRP groups multiple routing devices into a virtual router and uses the virtual gateway device's IP address as the default gateway address. When the gateway fails, VRRP selects a new gateway to transmit service traffic to ensure reliable communication.

Basic Concept

In the Figure  HostA is dual-homed to SwitchA and SwitchB through the switch. SwitchA and SwitchB constitute a VRRP group to implement link redundancy.

Introduction to VRRP-2758431-1

VRRP in Active/Standby Mode

Active/Standby is the basic VRRP working mode, In the Figure. In active/standby mode, a virtual router consists of one master and multiple backups.

SwitchA is the master and forwards service packets. SwitchB and SwitchC are backups and do not forward service packets. SwitchA periodically sends VRRP Advertisement packets to SwitchB and SwitchC, notifying other switches that SwitchA is working properly. If SwitchA is faulty, a new master is selected from SwitchB and SwitchC based on their priorities. The new master then takes over traffic.

After SwitchA recovers, it becomes the master in preemption mode. In non-preemption mode, SwitchA remains in Backup state.

Introduction to VRRP-2758431-2

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Created Sep 22, 2018 19:09:48

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Author Created Sep 22, 2018 21:47:08

Good share
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Created Sep 23, 2018 07:00:50

Thanks dear faysalji
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