3Com Router User Manual

DCC Configuration Examples737
DCC Application Using 
ISDN BRI Interface to 
Dial and Providing 
Leased LineTo implement circular DCC, use a B channel on the ISDN BRI interface to provide a 
leased line, and another B channel to implement remote dialing connection. 
As shown in Figure 235, the B2 channel on the interface Bri0 of RouterA is 
connected to the B1 channel on the interface Bri0 of RouterC to provide a leased 
line, whereas the B1 channel is connected to RouterB to implement dialing...

738CHAPTER 51: CONFIGURING DCC
callback servers. RouterA and RouterC use the same address 100.1.1.1, whereas 
RouterB and RouterD use the same address 100.1.1.2.
Figure 236   Network for the DCC application providing router-to-router callback
Solution 1: 
Use Circular DCC to implement PPP callback. The server determines whether to 
originate a return call to a client according to the user names configured in the 
dialer routes.
1Configure RouterA:
[Router] dialer-rule 1 ip permit
[Router] interface...

DCC Configuration Examples739
[Router-Serial0] ip address 100.1.1.1 255.255.255.0
[Router-Serial0] physical-mode async
[Router-Serial0] modem
[Router-Serial0] dialer enable-circular
[Router-Serial0] dialer-group 1
[Router-Serial0] dialer route ip 100.1.1.2 8810052
[Router-Serial0] link-protocol ppp
[Router-Serial0] ppp pap local-user usera password simple usera
[Router-Serial0] ppp callback client
2Configure RouterB:
[Router] dialer-rule 2 ip permit
[Router] local-user usera password simple usera...

740CHAPTER 51: CONFIGURING DCC
Figure 237   Network for the DCC application providing router-to-PC callback
1Configure the PC:
aConfigure the modem connected to the PC to be in “autoanswer mode”. 
bSelect Start > Programs > Accessories > Communications > Dialup network. 
cClick Set up new connection in the Dialup network window. 
dSelect the Server type page in the established new connection, and perform 
the following operations:
■Select the option [PPP]
■Set the [Logon network] option as unchecked
■Set...

DCC Configuration Examples741
Figure 238   Network for the DCC application providing NT server-to-router callback
1Configure RouterA:
[Router] dialer-rule 1 ip permit
[Router] interface async 0
[Router-Async0] async mode protocol
[Router-Async0] link-protocol ppp
[Router-Async0] ppp callback client
[Router-Async0] ppp pap local-user Router password simple Router
[Router-Async0] ip address ppp-negotiate
[Router-Async0] dialer enable-circular
[Router-Async0] dialer-group 1
[Router-Async0] dialer route ip...

742CHAPTER 51: CONFIGURING DCC
Dial Number Circular 
Standby and Internet 
Access for DCCIn PSTN, the dial number circular standby is fulfilled through configuring the 
dialer route command at the dialing side. The access side provides the 
accessing service for DCC via the asynchronous serial interface, and adopts the 
PAP authentication to authenticate the validity of the dialing party. In ISDN, single 
dialer number and CHAP authentication are adopted, and other configurations are 
similar to the PSTN...

DCC Configuration Examples743
[Router-Serial0] ip address ppp-negotiate
[Router-Serial0] dialer enable-circular
[Router-Serial0] dialer-group 1
[Router-Serial0] dialer route ip 100.1.1.254 8810048
[Router-Serial0] dialer route ip 100.1.1.254 8810049
……
[Router-Serial0] dialer route ip 100.1.1.254 8810055
[Router-Serial0] link-protocol ppp
[Router-Serial0] ppp pap local-user user1 password simple user1
2Configure RouterB:
[Router] dialer-rule 2 ip permit
[Router] aaa-enable
[Router] aaa...

744CHAPTER 51: CONFIGURING DCC
cStart dialing, and input the user name user1 and the password pass1.
Solution 2: 
The dialing side uses a single number to dial, and the accessing side uses circular 
DCC to set up the connection via the ISDN PRI interface. Configure the DCC 
parameters on the dialer interface.
1Configure RouterC:
[Router] dialer-rule 1 ip permit
[Router] local-user userb password simple passb
[Router] interface bri 0
[Router-Bri0] ip address ppp-negotiate
[Router-Bri0] dialer-group...

DCC Configuration Examples745
Figure 240   Network for the DCC application providing logic interface standby through 
dialer route
Solution 1: 
Adopt circular DCC and use the logic interface configured through the dialer 
route command as the standby interface.
1Configure RouterA:
[Router] dialer-rule 1 ip permit
[Router] interface serial 0
[Router-Serial0] physical-mode async
[Router-Serial0] modem
[Router-Serial0] ip address 100.1.1.1 255.255.255.0
[Router-Serial0] dialer enable-circular...

746CHAPTER 51: CONFIGURING DCC
[Router-Serial0] dialer route ip 100.1.1.2 8810060 logic-channel 1
[Router-Serial0] logic-channel 1
[Router-logic-channel1] standby interface serial 1
[Router-logic-channel1] interface serial 1
[Router-Serial1] ip address 200.1.1.1 255.255.255.0
[Router-Serial1] link-protocol ppp
2Configure RouterB:
[Router] dialer-rule 2 ip permit
[Router] interface serial 0
[Router-Serial0] physical-mode async
[Router-Serial0] modem
[Router-Serial0] ip address 100.1.1.2 255.255.255.0...