Configuring Persistent Backup For Multiple Connections - HP ProCurve Secure Router 7203 dl Advanced Management And Configuration Manual

Configuring Persistent Backup for Multiple Connections

A single analog or ISDN module can back up any number of connections,
although, of course, it can only actively back up one failed connection at a
time. To enable backup on multiple connections simply configure a backup
dial list for each connection.
Special considerations for backing up multiple connections include:
setting a connection's priority
configuring multiple backup interfaces
Priority. A connection's relative priority determines which connection a
backup module serves when more than one connection goes down at a time.
By default, every connection for which backup has been configured has a
priority of 50. The router will back up the connection with the higher priority
value.
In a Frame Relay network, a backup line can only provide a connection for one
PVC at a time. If your router has a Frame Relay WAN connection with multiple
PVCs, you should set the highest priority for the most mission critical PVC.
To set the priority for a connection, move to the logical interface configuration
mode context for that connection. Enter this command:
Syntax: backup priority <priority>
A connection's priority can be between 0 and 100, with 100 the highest priority.
Multiple Backup Interfaces. You can use the same backup interface for
more than one connection, but you should configure a separate backup
interface for each connection when using authentication. A PPP interface can
only store one username and password in its database. If the peers for the
different connections have different usernames, you need to create and
configure a separate backup PPP interface for each. Map the backup interface
to the primary interface in the primary interface's backup dial list.
Configuring Backup WAN Connections
Configuring a Persistent Backup Connection
3-69