Netopia 3300-ENT Series Скачать руководство пользователя страница 243

Страница: 243 / 334

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

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

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.