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Cisco IOS Dial Services Quick Configuration Guide
Chapter 3 Configuring the Cisco 1604 Router
Step 4—Configuring Basic Rate Interface
Step 4—Configuring Basic Rate Interface
Enable the Cisco 1604’s Basic Rate Interface (BRI) connectivity with the telephone company’s central
office switch. PPP framing is used on the B channels.
You can authenticate the remote side on any connection. The callin keyword used in Step 7 below means
that all outbound connection attempts made by the Cisco 1604 will not authenticate the remote peer,
which is the device at the other end of the PPP link (Cisco AS5300). Only the calls that come into the
Cisco 1604 are authenticated.
Note On BRI interfaces, it is not necessary to configure dialer inband because the BRI
interfaces are dialer inband interfaces by default. Interfaces BRI0:1 and BRI0:2 are
controlled by the dialer interface interface bri 0.
To configure BRI on the Cisco 1604, enter the following commands beginning in global configuration
mode:
Step 1 Configure the ISDN switch type, which is basic-ni1 in this example.
robo-austin(config)# isdn switch-type basic-ni1
Step 2 Configure the IP address and subnet mask on the BRI interface.
robo-austin(config)# interface bri 0
robo-austin(config-if)# ip address 10.1.254.4 255.255.255.0
Step 3 Configure your SPIDs, which are required by many switch types.
robo-austin(config-if)# isdn spid1 51255544330101
robo-austin(config-if)# isdn spid2 51255544340101
Step 4 Enable PPP.
robo-austin(config-if)# encapsulation ppp
Step 5 Disable fair queuing.
robo-austin(config-if)# no fair-queue
Step 6 Enable PPP multilink.
robo-austin(config-if)# ppp multilink
Step 7 Enable CHAP and PAP authentication on the interface during LCP negotiation. The access server first
authenticates with CHAP. If CHAP is not used by the remote client, then the access server tries PAP.
CHAP is requested first.
robo-austin(config-if)# ppp authentication chap pap callin
Step 8 Bring up the interface. The no shutdown command changes the state of the interface from
administratively down to up.
robo-austin(config-if)# no shutdown