Cisco OL-4015-08 User Manual page 73

Chapter 3 Create Connection Wizards
Step 5
Step 6
How Do I Configure Dial-on-Demand Routing for my ISDN or
Asynchronous Interface?
Step 1
Step 2
Step 3
OL-4015-08
The Dynamic Routing dialog box appears, displaying the tab for the dynamic
routing protocol you selected.
Using the fields in the Dynamic Routing dialog box, configure the dynamic
routing protocol. If you need an explanation for any of the fields in the dialog box,
click Help.
When you have finished configuring the dynamic routing protocol, click OK.
ISDN BRI and asynchronous connections are dial-up connections, meaning that
in order to establish a connection, the router must dial a preconfigured phone
number. Because these cost of these types of connections is usually determined
by the amount of time that a connection was established, and in the case of an
asynchronous connection, that a phone line will be tied up, it is often desirable to
configure Dial-on-Demand Routing (DDR) for these connection types.
SDM can help you configure DDR by:
• Letting you associate a rule (or ACL) with the connection, which causes the
router to establish the connection only when it recognizes network traffic that
you have identified as interesting with the associated rule.
Setting idle timeouts, which cause the router to end a connection after a
•
specified amount of time when there is no activity on the connection.
Enabling multilink PPP, which causes an ISDN BRI connection to use only
•
one of the two B channels unless a specified percentage of bandwidth is
exceeded on the first B channel. This has the advantage of saving costs when
network traffic is low and the second B channel is not needed, but letting you
utilize the full bandwidth of your ISDN BRI connection when needed.
To configure DDR on an existing ISDN BRI or asynchronous connection:
Click Configure on the SDM toolbar.
Click Interfaces and Connections in the left frame.
Click the ISDN or asynchronous interface on which you want to configure DDR.
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