Routing
Virtual Router Redundancy Protocol (VRRP)
IX14 User Guide
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12. (Optional) Set the amount of time to wait for an IP address update to succeed before retrying
the update:
(config network ddns new_ddns_instance)> retry_interval
value
(config network ddns new_ddns_instance)>
where
value
is any number of weeks, days, hours, minutes, or seconds, and takes the format
number
{
w|d|h|m|s
}.
For example, to set
retry_interval
to ten minutes, enter either
10m
or
600s
:
(config network ddns new_ddns_instance)> retry_interval 600s
(config network ddns new_ddns_instance)>
The default is
60s
.
13. (Optional) Set the number of times to retry a failed IP address update:
(config network ddns new_ddns_instance)> retry_count
value
(config network ddns new_ddns_instance)>
where
value
is any interger. The default is
5
.
14. Save the configuration and apply the change:
(config)> save
Configuration saved.
>
15. Type
exit
to exit the Admin CLI.
Depending on your device configuration, you may be presented with an
Access selection
menu
. Type
quit
to disconnect from the device.
Virtual Router Redundancy Protocol (VRRP)
Virtual Router Redundancy Protocol (VRRP) is a standard for gateway device redundancy and failover
that creates a "virtual router" with a floating IP address. Devices connected to the LAN then use this
virtual router as their default gateway. Responsibility for the virtual router is assigned to one of the
VRRP-enabled devices on a LAN (the "master router"), and this responsibility transparently fails over
to backup VRRP devices if the master router fails. This prevents the default gateway from being a
single point of failure, without requiring configuration of dynamic routing or router discovery
protocols on every host.
Multiple IX14 devices can be configured as VRRP devices and assigned a priority. The router with the
highest priority will be used as the master router. If the master router fails, then the IP address of the
virtual router is mapped to the backup device with the next highest priority. Each VRRP router is
configured with a unique LAN IP address, and the same shared VRRP address.
VRRP+
VRRP+ is an extension to the VRRP standard that uses network probing to monitor connections
through VRRP-enabled devices and can dynamically change the priority of the devices, including
changing devices from master to backup, and from backup to master, even if the device has not
failed. For example, if a host becomes unreachable on the far end of a network link, then the physical
default gateway can be changed by adjusting the VRRP priority of the IX14 device connected to the
failing link. This provides failover capabilities based on the status of connections behind the router, in
