Operation Manual

Advanced Configuration 197
This section describes how to use the Internetworking Configuration
utility (INETCFG) to configure a backup call for a WAN connection.
A backup call enhances the reliability of your WAN. It ensures that
new connections are made successfully and that permanent connec-
tions are maintained even if your primary WAN call destination goes
down. As a result, you avoid unnecessary delays and maintain high
reliability over your WAN connection.
When you configure a backup call, you specify a backup WAN call
destination to be used in the event that the primary WAN call desti-
nation becomes unavailable. NetWare MultiProtocol Router for ISDN
switches automatically to the backup WAN call destination if the
primary WAN call destination goes down. When the primary connec-
tion is restored, NetWare MultiProtocol Router for ISDN switches to
the primary and terminates the backup.
You specify a backup WAN call destination by configuring two
existing WAN call destinations to have an association by which
NetWare MultiProtocol Router for ISDN recognizes one as the pri-
mary destination and the other as its backup.
Example:
You can use a secondary circuit-switched connection as a backup for a
leased line connection. As soon as the leased line connection is inter-
rupted, the circuit-switched connection would be used.
Configuring Backup Calls for LAN-LAN Connections
Configuring a Backup Call Association
Before you begin, complete the following steps:
Configure two ISDN call destinations to the same destination so that
you can associate one as the backup for the other:
- For both call destinations, set the Call Type to Permanent.
- For the primary call destination, do not forget to change the Retry
Mode to Retry All Failures and adjust the Retry Limit Handling and
the Retry Interval.
To configure a backup call association, complete the following steps:
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