Configuring Vrrp; Vrrp Overview; How Does Vrrp Work - Dell M6220 User Configuration Manual

Configuring VRRP

This chapter describes how to configure Virtual Routing Redundancy
Protocol (VRRP) on the switch. VRRP can help create redundancy on
networks in which end-stations are statically configured with the default
gateway IP address.
The topics covered in this chapter include:
•

VRRP Overview

• Default VRRP Values
• Configuring VRRP Features (Web)
• Configuring VRRP Features (CLI)
• VRRP Configuration Example
VRRP Overview
The Virtual Router Redundancy (VRRP) protocol is designed to handle
default router (L3 switch) failures by providing a scheme to dynamically elect
a backup router. VRRP can help minimize black hole periods due to the
failure of the default gateway router during which all traffic directed towards
it is lost until the failure is detected.

How Does VRRP Work?

VRRP eliminates the single point of failure associated with static default
routes by enabling a backup router to take over from a master router without
affecting the end stations using the route. The end stations will use a virtual
IP address that will be recognized by the backup router if the master router
fails. Participating routers use an election protocol to determine which router
is the master router at any given time. A maximum of 50 virtual routers may
be configured. A given port may appear as more than one virtual router to the
network, also, more than one port on a switch may be configured as a virtual
router. Either a physical port or a routed VLAN may participate.
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