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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
1 Configure 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
2 Configure 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
3 Configure 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-Router
Callback for DCC
Two routers implement PPP callback via the serial interfaces across PSTN, and ISDN
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
8810152
8810148
Router A
Router B
Router C
ISDN
Bri0
Bri1
Bri0
NT1
NT1
NT1