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The firmware offers line backup functionality in the event of a line failure on a DSL, Ethernet, or leased-line
primary WAN link. The firmware supports backup
■ to an external modem connected to the Console port or
■ to a backup default gateway.
Configuration of either method is similar, but differences are noted in their respective sections.
This chapter covers the following topics:
■ “External Dial Backup Support” on page 7-2
■ “Configuring External Dial Backup” on page 7-2
■ “WAN Configuration” on page 7-2
■ “Connection Profiles” on page 7-7
■ “Using Scheduled Connections with Backup” on page 7-8
■ “Management/Statistics” on page 7-10
■ “QuickView” on page 7-12
■ “Event Logs” on page 7-12
■ “SNMP Support” on page 7-13
■ “Backup Default Gateway” on page 7-13
The purpose of backup is to provide a recovery mechanism in the event that the primary connection fails. A
failure can be either line loss, for example by central site switch failure or physical cable breakage, or in the
case of Frame Relay (with LMI) or PPP, loss of end-to-end connectivity. Detection of one of these failures causes
the router to switch from using the primary WAN port to using the Console port to which a modem has been
attached. Alternatively, you can choose backup to an alternate gateway on the Ethernet LAN.
In the event of a loss of primary connectivity you have the option of switching back to the primary port
automatically once it has recovered its connection.