
Dial Backup Implementation Notes
114062 Rev. A 5-7
Sample Application Using Demand Circuit Groups
Figure 5-2 shows one of the main applications for using unnumbered demand
circuit groups. Router 1 is a regional router that supports potentially hundreds of
remote nodes. Router 5 serves as a recovery router for several branch offices if the
regional router (Router 1) fails.
Figure 5-2. Dialing an Alternate Site Using Demand Circuit Groups
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
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