Configuring network interfaces Configure Ethernet interfaces
Digi TransPort® Routers User Guide
195
Configure Ethernet Virtual Router Redundancy Protocol (VRRP)
VRRP (Virtual Router Redundancy Protocol) allows multiple physical routers to appear as a single
gateway for IP communications in order to provide back-up WAN communications in the event that
the primary router in the group fails in some way. It works by allowing multiple routers to monitor
data on the same IP address. One router is designated as the master of the address and under
normal circumstances it will route data as usual. However, the VRRP protocol allows the other routers
in the VRRP group to monitor the master and if they detect that it is no longer operating, negotiate
with each other to take over the role as owner. The protocol also facilitates the automatic re-
prioritization of the original owner when it returns to operation.
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1. Go to Configuration > Network > Interfaces >Ethernet>ETH n > VRRP.
2. Enter VRRP parameters:
Enable VRRP on this interface
Enables VRRP on this interface.
VRRP Group ID
The VRRP group ID parameter identifies routers that are configured to operate within the
same VRRP group. The default value is 0 which means that VRRP is disabled on this Ethernet
interface. The value may be set to a number from 1 to 255 to enable VRRP and include this
Ethernet port in the specified VRRP group.
VRRP Priority
The priority level of this Ethernet interface within the VRRP group from 0 to 255. 255 is the
highest priority and setting the priority to this value would designate this Ethernet interface as
the initial master within the group. The value selected for the VRRP priority should reflect the
values selected for other routers within the VRRP group, such as no two routers in the group
should be initialized with the same value.
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