B&B Electronics RT3G-300_310_320_330_340-W - Configuration Manual - Manual (Page 22)

B&B Electronics, Inc. SPECTRE Configuration Manual
22
SPECTRE_Configuration_Manual_2912m
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1.9. VRRP configuration
Select the VRRP menu item to enter the VRRP configuration. VRRP protocol (Virtual
Router Redundancy Protocol) allows you to transfer packet routing from the main router to a
backup router in case the main router fails. This can be used to provide a wireless cellular
backup to a primary wired router in critical application. If the Enable VRRP is checked, you
may set the following parameters.
Item Description
Virtual Server
IP Address This parameter sets the virtual server IP address. This address must be
the same for both the primary and backup routers. Devices on the LAN
will use this address as their default gateway IP address.
Virtual Server
ID This parameter distinguishes one virtual router on the network from
another. The main and backup routers must use the same value for this
parameter.
Host Priority The active router with highest priority set by the parameter Host Priority, is
the main router. According to RFC 2338, the main router should have the
highest possible priority - 255. The backup router(s) have a priority in the
range 1
– 254 (default value is 100). A priority value of 0 is not allowed.
Table 12: VRRP configuration
You may set the Check PPP connection flag in the second part of the window to
enable automatic test messages for the cellular network. In some cases, the PPP connection
could still be active but the router will not be able to send data over the cellular network. This
feature is used to verify that data can be sent over the PPP connection and supplements the
normal VRRP message handling. The currently active router (main/backup) will send test
messages to the defined Ping IP Address at periodic time intervals (Ping Interval) and wait
for a reply (Ping Timeout). If the router does not receive a response to the Ping command, it
will retry up to the number of times specified by the Ping Probes parameter. After that time, it
will switch itself to a backup router until the PPP connection is restored.
Item Description
Ping IP Address Destination IP address for the Ping commands.
Ping Interval
Interval in seconds between the outgoing Pings.
Ping Timeout Time in seconds to wait for a response to the Ping.
Ping Probes Maximum number of failed ping requests
Table 13: Check PPP connection
You may use the DNS server of the mobile carrier as the destination IP address for
the test messages (Pings).
The Enable traffic monitoring option can be used to reduce the number of
messages that are sent to test the PPP connection. When this parameter is set, the router
will monitor the interface for any packets different from a ping. If a response to the packet is
received within the timeout specified by the Ping Timeout parameter, then the router knows
that the connection is still active. If the router does not receive a response within the timeout
period, it will attempt to test the PPP connection using standard Ping commands.