Ericsson ECN330, User Manual

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Configuring the ECN330-switch
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1553-KDU 137 365 Uen D 2006-06-16
Figure 167 Several Virtual Master Routers Configured for Mutual Backup and
Load Sharing
Note: 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 380.
6.19.1 Virtual Router Redundancy Protocol
Virtual Router Redundancy Protocol (VRRP) allows a group of routers to be
configured 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.
6.19.1.1 Configuring VRRP Groups
To configure VRRP, select an interface on one router in the group to serve as the
master virtual router. This physical interface is used as the virtual address for the
router group. Now set the same virtual address and a priority on the backup
routers, and configure an authentication string. The preempt feature can also be
enabled, which allows a router to take over as the master router when it comes
on line.
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