Some basic configuration is necessary on
a router in order for DDR to function correctly. Figure
shows the topology of router-to-router DDR. The configuration shows
how you can combine commands to set up ISDN and DDR. DDR is
configured to connect Cisco-a to Cisco-b by using legacy DDR, which
uses dialer map
statements. Table
describes the commands used in the configuration.
Note: Click on the topology to view
router configurations.
In Figure
, the network between the serial interfaces of the two routers uses
eight bits of subnetting. Static route statements define the IP
route to the Cisco-b LAN interfaces over 192.168.1.0. Interesting
traffic is defined as any IP traffic that initiates a DDR call to
Cisco-b.
The number dialed is for the remote
ISDN device. The service provider offering the ISDN service provides
this number. Traffic is routed to the LAN shown on the right in
Figure
. Before a connection can be made, static routes of how to reach those
networks must be in place. When Cisco documentation mentions legacy
DDR, it refers to configurations that use dialer-map
statements.
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Lab
Activity |
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The
Denver office needs to control what
interesting traffic will bring up the ISDN
connection to the Phoenix office. You will
setup an extended ACL and apply it to the
dialer group. |
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