Netopia 3300 - Manual (Page 243)

Line Backup 8-11
Should this address become unreachable the router will treat this as a loss of connectivity and begin the
backup timer. This loss is a Layer 2 loss.
Note: For best results, enter an IP address and not a host name. If a host name is used it may not be
resolvable, and may keep the inter face down.
Set the Ping Host Name or IP Address to the router's Default Gateway, or other reliable IP address
elsewhere on the backbone – for example, a DNS ser ver. This will ensure that the router will initiate backup
connection on loss of Layer 3.
Note: If you want the router to initiate the backup connection on loss of Layer 1 or 2 only (Physical or Data
link Layer), leave Ping Host Name or IP Address blank. Do not use 0.0.0.0 in this field. Hit the space bar or
Delete key to CLEAR the field totally. Leaving 0.0.0.0 in this field tells the router to ping an address that does
not exist.
• Select Recovery to ADSL and press Return. Choose either Manual or Automatic to determine how the
system will return to the primar y WAN link when it becomes available again. If you choose Automatic, the
next two menu items become visible.
Note: Automatic recover y only works upon loss of primar y WAN connectivity.
• If you chose Automatic Recover y, select Requires Recovery of (minutes) and enter the number of min-
utes that the system should wait before it assumes that a connection has been re-established. This
allows you to be sure that the primar y WAN connection is well re-established before the router
switches back to it from the backup mode. If the router's primar y connection fails at layer 1, the
Requires Recovery of (minutes) parameter determines the amount of time the primar y layer 1 connec-
tion must be up (recovered) before the router will tear down the backup connection and rever t to the
primar y inter face.
• Select Clear Backup Call only if idle. The default Yes will prevent the backup call from being torn down if
there is activity on the backup connection when the primar y connection comes back up. You can toggle this
to No if you wish.
The Clear Backup Call only if Idle timer is a separate timer from the Requires Recovery of (minutes)
timer. The router will first reach the Requires Recover y of (minutes) counter and count down to zero. Then
the router will consult the Clear Backup Call only if Idle timer to learn if the backup connection has been
idle for the specified seconds. If the connection has been idle for the specified seconds, then the teardown
process of the backup connection will begin.
• Requires idle time of (seconds) specifies how long the device should wait before permitting the call to be
torn down after a period of inactivity.
• Toggling Backup mode disables RIP/Primary to Yes (disabled) allows you to disable RIP ser vices on the
primar y WAN inter face when the Router is in Backup mode. RIP ser vices ordinarily will continue to run on
the primar y inter face when in Backup mode, attempting to determine “layer 2” connectivity.
Usually, the default No setting is desirable, since it may be required to ping the configured host that
determines “layer 2” connectivity. However, RIP running on the recovering primar y inter face may cause
problems specific to your application. When in Backup mode, RIP routes are still sent and received through
the primar y inter face, even though that is not the active inter face.