Host Interface Watchdog - Sierra Wireless AirLink ES440 User Manual

Field
Priority
Virtual IP
Mode
Interval
Rev 1 Nov.14
Description
Use this field to configure the priority for the AirLink device.
The device with the highest priority (typically a 3rd party router) provides the primary data
traffic route. If the device loses its connection to the WAN, its priority number drops. If the
device fails, then when the failure is detected, the next highest priority router becomes the
active router.
The priority number configured on the VRRP Backup (typically the AirLink device) should
be less than the initial priority number on the VRRP Master and greater than the value that
the VRRP Master's priority number would be if it drops as a result of losing its WAN
connection.
For example, if the VRRP Master router has an initial priority number of 200 that drops to
80 if it loses its WAN connection, setting the AirLink device's priority to 100 ensures that it
becomes the primary route if the VRRP Master loses its WAN connection. When the 3rd
party router re-establishes its connection, its priority returns to 200 and it once again
becomes the primary route for data.
Options are:
•
1–255 (Default is 100.)
Configure the same virtual IP for the VRRP Backup (typically the AirLink device) and the
VRRP Master (typically a 3rd party router). The virtual IP must be within the VLAN subnet.
Indicates the initial mode for the AirLink device
Options are:
•
MASTER
•
BACKUP (default)
Note: Designating a device as "Master" in this field does not make it the primary route for
data unless it is also given a higher priority number than the VRRP Backup device. See
Priority.
If the AirLink device is acting as VRRP Master, it advertises its Master status at the interval
(in seconds) configured in this field. Options are:
•
1–65535 seconds (Default value is 1.)

Host Interface Watchdog

The Host Interface Watchdog provides a way for you to ensure that the LAN
connection is alive. You can use this feature to monitor:
• A host connected to the LAN via an Ethernet or USB connection
When the Host Interface Watchdog is enabled, ALEOS sends a ping to the
connected host at configured intervals. You can disable Force Keepalive to only
send a ping when there is no traffic on the LAN interface. (See
Keepalive on page 126.)
If there is no response to the ping, the LAN interface is reset.
Note: The network interface is automatically determined from the IP address and the LAN
configuration.
LAN Configuration
Force LAN
125