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Several virtual master routers using the same set of backup routers.

Several virtual master routers configured for mutual backup and load

sharing. Load sharing can be accomplished by assigning a subset of

addresses to different host address pools using the DHCP server. ( See

“Configuring Address Pools” on page 3-217.)

Virtual Router Redundancy Protocol

Virtual Router Redundancy Protocol (VRRP) allows you to configure a

group of routers as a single virtual router. The virtual router group is

configured with a single virtual IP address that can be used as the default

gateway for host devices on the attached network.

MasterRouter

VRID23
IP(R1)= 192.168.1.3
IP(VR23)= 192.168.1.3
VRPriority = 255

MasterRouter

VRID25
IP(R2)= 192.168.2.17
IP(VR25)= 192.168.2.17
VRPriority = 255

BackupRouter

VRID23
IP(R3)= 192.168.1.4
IP(VR23)= 192.168.1.3
VRPriority = 100
VRID25
IP(R3)= 192.168.2.18
IP(VR23)= 192.168.2.17
VRPriority = 100

Router1

VRID23 (Master)
IP(R1)= 192.168.1.3
IP(VR23)= 192.168.1.3
VRPriority = 255
VRID25 (Backup)
IP(R1)= 192.168.1.3
IP(VR25)= 192.168.1.5
VRPriority = 100

Router2

VRID23 (Backup)
IP(R1)= 192.168.1.5
IP(VR23)= 192.168.1.3
VRPriority = 100
VRID25 (Master)
IP(R1)= 192.168.1.5
IP(VR25)= 192.168.1.5
VRPriority = 255
Hosts(192.168.1.10-99)
Hosts(192.168.1.100-250)
LANSegment A
LANSegment B