Digi Connect WAN Series User Manual page 72

Digi Connect WAN Family web interface
"virtual router." Two or more physical routers are configured to stand for the virtual router, with only
one doing the actual routing at any given time. The virtual router has a unique You can share IP
address and MAC address with all routers in a VRRP group. Using a virtual router redundancy protocol
allows you to configure systems with a single default gateway, rather than running an active routing
protocol.
There are two roles in VRRP: master, and backup. The master represents the virtual router and
forwards IP traffic. The physical router that is currently routing the data is known as the Master. If the
Master router fails, another Backup router automatically replaces it. Backup routers monitor the
health of the master router, and in the event that the master stops sending advertisements, backup
routers stage an election to determine which one will be the next master, and take over the virtual
router IP address. The time required to make the determination that the master is down and hold
elections depends on configuration, but typically occurs in about 3 seconds.
You can configure a number of VRRP groups (up to 255) on a LAN. A router may participate in multiple
groups. All routers must be within one hop of each other (does not route).
VRRP settings include:
Virtual Router Identifier (VRID): The virtual router ID. All routers in the same VRID
n
communicate with each other. Specify a VRID value between 1 and 255. All routers that are to
communicate must have the same VRID.
Priority: Determines which router is the master. The router with the highest priority is the
n
master. The default priority is 100.
Advertisement Interval: The amount of time in milliseconds between VRRP master
n
advertisements. Set all routers in the virtual routing group to the same value. 3000 msec (3
seconds) is typically used.
Enable Preempt: This settings controls whether a higher priority Backup router preempts a
n
lower priority Master. Select the check box to enable preemption; clear the check box to
prohibit preemption. The default setting is enabled.
IP Address: The IP Address of the virtual router. All routers in the same VRID should use the
n
same virtual IP address. Configure clients to use this value as their default gateway.
Advanced Network Settings
The Advanced Network Settings define the network interface. These settings rarely need to be
changed. Contact your network administrator for more information about these settings.
IP settings
Use the IP settings to manage IP address configuration.
Host Name: The host name to be placed in the DHCP Option 12 field. This is an optional setting
n
which is only used when DHCP is enabled.
The host name is validated and must contain only specific characters. These restrictions are as
defined in RFCs 952, 1035, 1123 and 2132. The following characters are permitted:
Alphabetic: upper and lower case letters A through Z and a through z
l
Numeric: digits 0 through 9
l
Hyphen (dash): -
l
Period (dot): .
l
Digi Connect WAN Family User Guide
Configuration through the web interface
72