Netgear Switch M4100 User Manual download pdf (Page 129)

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Chapter 9. VRRP | 129

9. VRRP

Virtual Router Redundancy Protocol

This chapter provides the following examples:

• VRRP on a Master Router on page 130

• VRRP on a Backup Router on page 132

When an end station is statically configured with the address of the router that will handle its

routed traf

fic, a single point of failure is introduced into the network. If the router goes down,

the end station is unable to communicate. Since static configuration is a convenient way to

assign router addresses, Virtual Router Redundancy Protocol (VRRP) was developed to

provide a backup mechanism.

Layer 3 switch

acting as router 1

Layer 3 switch

acting as router 2

Port 1/0/2

192.150.2.1

Virtual router ID 20

Virtual addr. 192.150.2.1

Port 1/0/4 VLAN

192.150.4.1

Virtual router ID 20

Virtual addr. 192.150.2.1

Layer 2 Switch

Hosts

Figure 15. VRRP

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 use a virtual IP address that is 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 given port could appear as more than one virtual

router to the network. Also, more than one port on a M4100 and M7100 Managed Switch can

be configured as a virtual router. Either a physical port or a routed VLAN can participate.

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