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742 CHAPTER 51: CONFIGURING DCC
Dial Number Circular
Standby and Internet
Access for DCC
In 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 side.
As shown in the following figure, RouterB and RouterD work as access server,
RouterA and RouterC at the dialing side accept the negotiated addresses assigned
by the remote ends. The address pool for allocation is in the range of 100.1.1.1 to
100.1.1.16. RouterB and RouterD use the address 100.1.1.254, and obtain the
dialer numbers 8810048 to 8810055 from the telecommunications service
provider. ISDN dial number is 8810148, which provides services for 16 network
users.
Figure 239 Network for the DCC application providing dial number circular standby and
accessing service
Solution 1:
Configure dial number circular standby on the dialing parties, adopt Circular DCC
to set up connections on the 8 asynchronous serial interfaces at the access side,
and configure the DCC parameters on the dialer interfaces.
1 Configure RouterA:
[Router] dialer-rule 1 ip permit
[Router] local-user userb password simple passb
[Router] interface serial 0
[Router-Serial0] physical-mode async
[Router-Serial0] modem
Modem
Modem
Modem
Modem
Modem
8810148
Provide accessing services on ISDN PRI interface
Provide accessing service on asynchronous interfaces
8810048
8810055
8810054
8810053
8810052
8810051
8810050
8810049
Modem
Modem
Modem
PSTN
Router A
ISDN
Modem
Modem
Async0 to
Async7
Serial2:15
Router B
Router C
Router D
Serial0
Bri0
Router
NT1
NT1
Internet
Internet
PC
Modem
……
Serial0
Router