Above all, we must see what's the isdn?The
integrated services digital network(ISDN)is a
group of standards that define how voice and data connections can be
dynamically set up accross digital circuits.
means
the concept of Legacy DDR(dial on demand routing) and dialer profiles. Legacy
DDR all ISDN parameters are configured under the Bri/Pri interface and not
under a dialer interface, however,with dialer profiles, you can effectively
moving some of the logical ISDN parameters from the physical BRI/PRI interface
to a dialer interface. Regardless of any cases, there is one point we should
notice, that's, any ip packet should represent 'interesting traffic' and either
router should be able to initiate the call,
in parallel, ppp encapsulation and
chap authentication should be used. Now we'd better take an example to illustrate above points.
1.
ISDN BRI-BRI using Legacy DDR
router1(config)# isdn switch-type basic-ni
router1(config)# dialer-list 1 protocol ip permit
router1(config)# username router2 password cisco
router1(config)# interface bri0
router1(config-if)# encap ppp
router1(config-if)# ip address 200.10.1.1 255.255.255.0
router1(config-if)# isdn spid1 32177820010100
router1(config-if)# dialer-group 1
router1(config-if)# dialer map ip 200.10.1.2 name router2 broadcast 7782002
router1(config-if)# ppp authentication chap
router1(config-if)# no shut
router2(config)# isdn switch-type basic-ni
router2(config)# dialer-list 1 protocol ip permit
router2(config)# username router1 password cisco
router2(config)# interface bri0
router2(config-if)# encap ppp
router2(config-if)# ip address 200.10.1.2 255.255.255.0
router2(config-if)# isdn spid1 32177820020100
router2(config-if)# dialer-group 1
router2(config-if)# dialer map ip 200.10.1.1 name router1 broadcast 7782001
router2(config-if)# ppp authentication chap
router2(config-if)# no shut
2.
ISDN BRI-BRI using Dialer Profiles
router1(config)# isdn switch-type basic-ni
router1(config)# dialer-list 1 protocol ip permit
router1(config)# username router2 password cisco
router1(config)# interface bri0
router1(config-if)# encap ppp
router1(config-if)# ppp authentication chap
router1(config-if)# isdn spid1 32177820010100
router1(config-if)# dialer pool-member 1
router1(config-if)# no shut
router1(config-if)# interface dialer 1
router1(config-if)# no shut
router1(config-if)# ip address 200.10.1.1 255.255.255.0
router1(config-if)# encap ppp
router1(config-if)# dialer-group 1
router1(config-if)# dialer pool 1
router1(config-if)# dialer remote-name router2
router1(config-if)# dialer string 7782002
router1(config-if)# ppp authentication chap
router2(config)# isdn switch-type basic-ni
router2(config)# dialer-list 1 protocol ip permit
router2(config)# username router1 password cisco
router2(config)# interface bri0
router2(config-if)# encap ppp
router2(config-if)# ppp authentication chap
router2(config-if)# isdn spid1 32177820020100
router2(config-if)# dialer pool-member 1
router2(config-if)# no shut
router2(config-if)# interface dialer 1
router2(config-if)# no shut
router2(config-if)# ip address 200.10.1.2 255.255.255.0
router2(config-if)# encap ppp
router2(config-if)# dialer-group 1
router2(config-if)# dialer pool 1
router2(config-if)# dialer remote-name router1
router2(config-if)# dialer string 7782001
router2(config-if)# ppp authentication chap
3.
ISDN PRI using Dialer Profiles
router1(config)# isdn switch-type basic-ni
router1(config)# dialer-list 1 protocol ip permit
router1(config)# username router2 password cisco
router1(config)# interface bri0/0
router1(config-if)# encap ppp
router1(config-if)# ppp authentication chap
router1(config-if)# isdn spid1 32177820010100
router1(config-if)# dialer pool-member 1
router1(config-if)# no shut
router1(config-if)# interface dialer 2
router1(config-if)# no shut
router1(config-if)# ip address 201.10.1.1 255.255.255.0
router1(config-if)# encap ppp
router1(config-if)# dialer-group 1
router1(config-if)# dialer pool 1
router1(config-if)# dialer remote-name router2
router1(config-if)# dialer string 7782002
router1(config-if)# ppp authentication chap
router2(config)# isdn switch-type primary-5esss
router2(config)# dialer-list 1 protocol ip permit
router2(config)# username router1 password cisco
router2(config)# controller t1 0/0
router2(config-controller)# framing esf
router2(config-controller)# linecode b8zs
router2(config-controller)# pri-group timeslots 1-24
router2(config-controller)# exit
router2(config)# interface serial0/0:23
router2(config-if)# encapsulation ppp
router2(config-if)# ppp authentication chap
router2(config-if)# dialer pool-member 2
router2(config-if)# no shut
Copyright (c) 1998-2004 Boson Software, Inc. All Rights Reserved.
router2(config-if)# interface dialer 2
router2(config-if)# ip address 201.10.1.2 255.255.255.0
router2(config-if)# encapsulation ppp
router2(config-if)# dialer-group 1
router2(config-if)# dialer pool 2
router2(config-if)# dialer remote-name router1
router2(config-if)# dialer string 7782001
router2(config-if)# ppp authentication chap
router2(config-if)# no shut
OK,so far as now,perhaps we all kown what the process is.