3Com 10014299 manual Router-Bri0dialer route ip 100.1.1.2, Router-Bri1dialer route ip 100.1.1.1

DCC Configuration Examples 737

DCC Application Using

ISDN BRI Interface to

Dial and Providing

Leased Line

To 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 connection. In the ISDN network, configure the correlation of virtual circuits on the switches respectively corresponding to RouterA and RouterC, so as to ensure both RouterA and RouterC can set up virtual circuit connections to the ISDN network. RouterA adopts Circular DCC to call RouterB and RouterC, so do RouterB and RouterC. The addresses of RouterA, RouterB and RouterC are respectively 100.1.1.1, 100.1.1.2, and 100.1.1.3.

Figure 235 Network for the DCC application using the ISDN BRI interface to dial and providing a leased line

Bri1

Bri0 8810152

	8810148	NT1	Router B
	ISDN
			Bri0
	NT1
Router A
		NT1

Router C

1Configure RouterA:

[Router] dialer-rule 1 ip permit

[Router] interface bri 0

[Router-Bri0]ip address 100.1.1.1 255.255.255.0

[Router-Bri0]dialer isdn-leased 2

[Router-Bri0] dialer-group 1

[Router-Bri0]dialer route ip 100.1.1.2 8810152

2Configure RouterB:

[Router] dialer-rule 2 ip permit

[Router] interface bri 1

[Router-Bri1]ip address 100.1.1.2 255.255.255.0

[Router-Bri1]dialer isdn-leased 1

[Router-Bri1] dialer-group 2

[Router-Bri1]dialer route ip 100.1.1.1 8810148

3Configure RouterC:

[Router] dialer-rule 1 ip permit

[Router] interface bri 0

[Router-Bri0]ip address 100.1.1.3 255.255.255.0

[Router-Bri0] dialer-group 1

[Router-Bri0]dialer route ip 100.1.1.1 8810148

Router-to-RouterTwo routers implement PPP callback via the serial interfaces across PSTN, and ISDN Callback for DCC callback with the ISDN caller identification technique across ISDN.

As shown in the following figure, in the circular DCC implementation, RouterA and RouterB are interconnected via the serial interfaces across PSTN, RouterC and RouterD are interconnected via ISDN BRI/PRI interfaces across ISDN. RouterA and RouterC are specified to be the callback clients, while RouterB and RouterD are