Technical data

Cisco 1604 Configuration 3-11
Step 5—Configuring DDR
Note Notice that the status and protocol for BRI 0 and Ethernet 0 are both up/up, which is what
we expect to see. The term manual means that you manually configured the interface since the
last reboot. The two B channels (BRI0:1 and BRI0:2) are down because there are no active calls
on the BRI interface at this time.
Tips
If you have trouble:
• Make sure the correct ISDN switch type and SPIDs are configured.
• Make sure your BRI line is connected to the correct port.
Step 5—Configuring DDR
Set up the DDR routing components. In most cases, a remote site with a single LAN will require a
simple DDR configuration. DDR is the mechanism that supports the routing table and call control in
a circuit switched environment.
DDR in this case study takes the standard dialer map approach. You must configure specific
parameters to establish connectivity with the Cisco AS5300 using sync PPP. Parameters include a
static route, username:password, and a dialer map.
Configure
To configure DDR, use the following commands beginning in global configuration mode:
Step Command Purpose
1
robo-austin(config)# interface bri 0
Enter configuration mode for the BRI
interface.
2
robo-austin(config-if)# dialer-group 2
Define the interesting packets that
activate the ISDN connection. Interesting
packets reset the idle timer and trigger
dialing.
This dialer filter is defined by the
dialer-list 2 command. See Step 7.
3
robo-austin(config-if)# no fair-queue
Disable fair queuing.
4
robo-austin(config-if)# no cdp enable
Disable the Cisco discovery protocol,
unless you are using it for a specific
purpose.
5
robo-austin(config-if)# dialer load-threshold 60 either
Configure the interface to bring up the
second B channel when the bandwidth
load exceeds 60/255.
6
robo-austin(config-if)# dialer map ip 10.1.254.1 name hq-sanjose
14085551234
robo-austin(config-if)# exit
Build a dialer map that maps to the
Cisco AS5300’s IP address, host name,
and directory number.
The static route in Step 8 points to this
dialer map.
7
robo-austin(config)# dialer-list 2 protocol ip permit
Define a DDR’s dialer-list to allow any
IP packets to establish and maintain
calls.