ISDN
Connecting a Remote Host
-The remote node will be connected to the WAN core via a BRI ISDN connection (2 B channels @ 64 Kbps + 1 D channel @16 Kbps = 144 Kbps).
-Data communication will take place via PPP encapsulation.
-Whenever the remote node user needs to connect to the district network, a connection will be made between the ISDN switch and the Greenway router.
Benefits of ISDN
ISDN can carry a variety of user traffic signals, including digital video, circuit-switched data, and telephone network services, while using the normal phone.
ISDN offers much faster call setup than modem connections.
ISDN provides a faster data transfer rate than modems by using the bearer channel (B channel of 64Kbps). With multiple B channels, ISDN offers users more bandwidth on WANs than some leased lines offer.
ISDN can provide a clear data path over which to negotiate PPP links.
ISDN provides great flexibility to the network designer because of its ability to use each of the B channels for separate voice and/or data applications.
ISDN Commands
!Setup switch type, static route, and ISDN dialer for Greenway router
Greenway(config)# isdn switch-type basic-5ess
Greenway(config)#ip route 88.19.0.1 255.255.128.0 88.19.0.2
Greenway(config)#dialer-list 1protocol ip permit
!Configure BRI 0 interface
Greenway(config)# interface BRI0
Greenway(config-if)#ip address 88.19.0.1 255.255.128.0
Greenway(config-if)#encapsulation PPP
!Refer to protocols in dialer-list to identify interesting packets
Greenway(config-if)#dialer-group 1
!Configure SPID numbers for each B-channel
Greenway(config-if)#isdn spid1 1234762101 5555555
Greenway(config-if)#isdn spid2 1234765110 5555556
!Enable CHAP authentication
Greenway(config-if)#ppp authentication chap
!Select call start, stop, etc
Greenway(config-if)#dialer idle-time out 300
Greenwayconfig-if)#dialer wait-for-carrier-time 15
Greenway(config-if)#no shutdown
Greenway(config-if)#exit
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