Controlling When A Backup Connection Can Be Established - HP ProCurve Secure Router 7203 dl Advanced Management And Configuration Manual

Configuring Backup WAN Connections
Configuring a Persistent Backup Connection
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For digital modules, you must also specify whether the ISDN line will use
a single channel (56 or 64 Kbps) or a bonded channel (112 or 128 Kbps).
You do so by entering the minimum and maximum DS0 or E0 channels.
Bonding calls is a proprietary feature. You can only establish bonded calls
between two ProCurve Secure Routers.
Backup interface—The backup interface is the PPP interface that actually
originates and/or answers the backup call and maintains the backup
connection. The backup dial list is where you map a primary interface to
its backup interface.
To configure the backup dial list, enter the following command from the
primary connection's logical interface:
Syntax: backup number <peer's LDN> [analog | digital-56k | digital-64k] [1 1 | 1 2] ppp
<backup interface number>
For example, if the remote site's number is 555-2222 and the routers use an
ISDN backup module, enter:
ProCurve(config-ppp 1)# backup number 5552222 digital-64k 1 2 ppp 2
You use the 1 1 option for an ISDN line that uses a single channel. The 1 2
option is for a bonded call.
You can add more than one number to the list. If the peer with the first number
does not answer within the connect timeout interval (see Table 3-10 on page
3-67), the router calls the second number. The router tries numbers in the order
that you enter them.
By default, the router retries the first backup number an unlimited number of
times even if you have configured a second number. If you want the router to
try the second number, set a number of times for the router to try the first.
(See "Setting Backup Timers" on page 3-66.)

Controlling When a Backup Connection Can Be Established

Because backup connections are dial up, you pay for them only when they are
active. You should specify the times that backup support is enabled so that a
connection does not become active when it is not needed. For example, your
organization may be closed over the weekend. If a WAN connection fails on
Friday night and a backup connection is allowed to come up, your company
will be charged for two days of a connection that no one was using.