HP ProCurve Secure Router 7203 dl Advanced Management And Configuration Manual page 113

Configuring Backup WAN Connections
Configuring Demand Routing for Backup Connections
If the ProCurve Secure Router processes all of the connect sequences and
cannot establish a dial-up connection, the connect sequence attempt fails. For
the configuration shown in Figure 3-8, the ProCurve Secure Router will make
three activation attempts—that is, it will process all connect sequence 10 up
to nine times and connect sequence 20 up to three times.
If all three attempts are unsuccessful, the ProCurve Secure Router will change
the status of the demand interface to "down (recovery active)." It will then
remove the IP address and any routes referencing the interface, allowing any
routes with higher metrics to take their place.
In 60 seconds, the ProCurve Secure Router will try to process the connect
sequences again (although the demand interface will remain down in recovery
active mode). If that attempt is unsuccessful, the ProCurve Secure Router will
try again in 60 seconds. Based on the configuration in Figure 3-8, the ProCurve
Secure Router will try up to five times or until a connection is successful.
If all the connection attempts made during the recovery active mode are
unsuccessful, the ProCurve Secure Router will change the status of the
demand interface to DOWN (recovery failed) until you intervene by shutting
down the demand interface or clearing the connection. If the demand interface
succeeds in establishing the backup connection, the ProCurve Secure Router
will change the status of the demand interface to UP (connected), activate the
IP address for the interface, and reinstate any routes that use the interface.
Figure 3-9 summaries this process.
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