
Dial Services Overview
308621-14.00 Rev 00
1-7
• The frame relay DLCMI fails.
If the DLCMI messages cannot be exchanged across the frame relay demand
circuit, the router deactivates the circuit.
Dial-on-demand is supported on asynchronous (RS-449), synchronous (RS-449,
V.35, RS-422, and X.21), and ISDN interfaces. Figure 1-2
shows a demand line
connecting two routers. When the router has data to transmit or when you
configure the router to bring up a demand circuit, the router instructs the dial
device to establish a connection.
Figure 1-2. Dial-on-Demand Service
Dial
device
Dial
device
Los Angeles
Chicago
Dallas
New York
Demand pool:
Slot 2
Back of
router
Data arrives at the New York router, but the final destination
is Dallas. A port in the demand pool transmits the data.
DS0013A
Dial
device
Dial
device
Dial
device
Comentarios a estos manuales