Levelone GTL-2690 User Manual download pdf (Page 309)

100

101

Configuring Router Redundancy

18-2

• 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 17-4.)

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.

Configuring VRRP Groups

To configure VRRP, select an interface on each router in the group that will

participate in the protocol as the master router or a backup router. To select a

specific device as the master router, set the address of this interface as the virtual

router address for the group. Now set the same virtual address and a priority on the

backup routers, and configure an authentication string. You can also enable the

preempt feature which allows a router to take over as the master router when it

comes on line if it has a higher priority than the currently active master router.

Command Usage

Address Assignment –

• To designate a specific router as the VRRP master, the IP address assigned to the

virtual router must already be configured on the router that will become the Owner

of the group address. In other words, the IP address for the virtual router exists on

one, and only one, router in the virtual router group, and the network mask for the

virtual router address is derived from the Owner. The Owner will also assume the

role of the Master virtual router in the group.

• If a virtual address is assigned to the group which does not exist on any of the

group members, then the master router is selected based on priority. In cases

Router 1

VRID 23 (Master)

IP(R1) = 192.168.1.3

IP(VR23) = 192.168.1.3

VR Priority = 255

VRID 25 (Backup)

IP(R1) = 192.168.1.3

IP(VR25) = 192.168.1.5

VR Priority = 100

Router 2

VRID 23 (Backup)

IP(R1) = 192.168.1.5

IP(VR23) = 192.168.1.3

VR Priority = 100

VRID 25 (Master)

IP(R1) = 192.168.1.5

IP(VR25) = 192.168.1.5

VR Priority = 255

Hosts (192.168.1.10-99)

Hosts (192.168.1.100-250)

LAN Segment A

LAN Segment B

1 2 ... 304 305 306 307 308 309 310 311 312 313 314 ... 788 789

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Levelone GTL-2690 User Manual Page 309

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