
Dial Backup Implementation Notes
114062 Rev. B 6-5
Figure 6-2. Dialing an Alternative Router Using Demand Circuit Groups
This type of network is ideal for a demand circuit group because it supports many
nodes. If you were to configure each circuit individually, the task of backing up
each remote router would be difficult. By using demand circuit groups, however,
you need only one configuration on the disaster recovery router to support many
remote sites.
R2
R3
R4
Regional router
R1
R5
Disaster
recovery router
CHAP Name = R1
Branch offices:
CHAP Name = R2
CHAP Name = R4
Configured with an
unnumbered demand
circuit group
Remotes configured
with dial backup
Key
Primary circuits
Backup circuits
DS0002A
Frame
Relay
ISDN
CHAP Name = R3
R3
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