Netopia 4000 Series, Руководство пользователя программного обеспечения

Страница: 189 / 314

Line Backup 7-1
C C
C Ch
h
h haa a ap
p
p pttttee e errrr 7
7
7 7
LLL
Liiiin
n
n nee e e B
B
B Baa a acccckk k ku
u
u up
p
p p
The firmware offers line backup functionality in the event of a line failure on a DSL, Ethernet, or leased-line
primar y WAN link. The firmware suppor ts backup
■
to an external modem connected to the Console por t 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 Suppor t” 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 Suppor t” on page 7-13
■
“Backup Default Gateway” on page 7-13
The purpose of backup is to provide a recover y mechanism in the event that the primar y 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 primar y WAN por t to using the Console por t 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 primar y connectivity you have the option of switching back to the primar y por t
automatically once it has recovered its connection.