Specifications

Chapter 4. Configuring Special Features 107
# pause), and finally the 7-digit local number.
remote setphone async 1 9,5554218 backup
# Specifies the bit rate for the preceding phone number.
# The bit rate can be 38400, 57600, 115200, or 230400.
remote setspeed 115200 async 1 backup
# Specifies the alternative phone number to be used and its bit rate.
remote setphone async 2 9,5554219 backup
remote setspeed 115200 async 2 backup
# Specifies the name and password provided by the ISP
remote setoursysname <username> backup
remote setourpasswd <password> backup
# Turns off authentication
remote disauthen backup
# Turns on Network Address Translation
remote setiptranslate on backup
# Adds a default route for the backup entry
remote addiproute 0.0.0.0 0.0.0.0 1 backup
VRRP Backup
When a router is defined as a static default gateway and no other dynamic routing protocol or router discovery
protocol is used (such as RIP, page 81), the gateway becomes a critical link in the network. If that router fails, that
critical link would be broken. It, therefore, may be appropriate to set up other routers as backups that can serve as
the static default gateway if necessary.
The Virtual Router Redundancy Protocol (VRRP), as defined in RFC 2338, allows other IP routers in a LAN to
provide immediate and automatic backup to a failed IP router. VRRP is a protocol that defines how backup
routers monitor the status of a master router and take over its function if it fails. The new master router adopts the
IP and MAC address of the original master, so that the hosts configured with the single default gateway maintain
their network connection.