Redundancy; Vrrp Configuration - NetModule NB800 Series User Manual

NBB-800
User Manual for NRSW version 4.5.0.100

5.7.15. Redundancy

This page can be used to set up a redundant pair of NetModule routers (or other systems) by running
the Virtual Router Redundancy Protocol (VRRP) between them. A typical VRRP scenario defines a
first host playing the master and another the backup device, they both define a virtual gateway IP
address which will be distributed by gratuitous ARP messages for updating the ARP cache of all LAN
hosts and thus redirecting the packets accordingly.
A takeover will happen within approximately 3 seconds as soon as the partner is not reachable any-
more (checked via multicast packets). This may happen when one device is rebooting or the Ethernet
link went down. Same applies when the WAN link goes down.
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In case DHCP has been activated, please keep in mind that you will need to reconfigure the DHCP
gateway address offered by the server and let them point to the virtual gateway address. In order to
avoid conflicts you may turn off DHCP on the backup device or even better, split the DHCP lease range
across both routers in order to prevent any lease duplication.
Parameter
Administrative status
ROUTING FIREWALL VPN SERVICES
Redundancy
Rule Id
Figure 5.48.: VRRP Configuration
Redundancy Configuration
Administrative status
146
SYSTEM
Interface Address
LOGOUT