
Implementation Notes
3-23
Sample Application Using Demand Circuit Groups
Figure 3-7 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 3-7. Dialing an Alternate Site Using Demand Circuit Groups
This type of network is ideal for an unnumbered demand circuit group because it
supports an extensive number of 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
ISDN
Frame
Relay
Regional
Router
R1
R5
Disaster
Recovery Router
CHAP Name = R1
Branch Offices:
CHAP Name = R2
CHAP Name = R3
CHAP Name = R4
Unnumbered
Demand Circuit
Group
Remotes Configured with
Dial Backup
Key:
Primary Circuits
Backup Circuits
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