Information Technology Reference
In-Depth Information
Nine switch types can be configured, as shown in Example 5-9. In the United States, the
Lucent 5ESS, Northern Telecom DMS-100, or National ISDN switch types are commonly used.
ISDN Switch Types
Example 5-9
R5(config)#isdn switch-type ?
basic-1tr6 1TR6 switch type for Germany
basic-5ess Lucent 5ESS switch type for the U.S.
basic-dms100 Northern Telecom DMS-100 switch type for the U.S.
basic-net3 NET3 switch type for UK, Europe, Asia and Australia
basic-ni National ISDN switch type for the U.S.
basic-qsig QSIG switch type
basic-ts013 TS013 switch type for Australia (obsolete)
ntt NTT switch type for Japan
vn3 VN3 and VN4 switch types for France
The BRI interface is configured with PPP encapsulation, optional authentication (PAP or
CHAP), and a
dialer map
command. The
dialer map
command maps the next hop IP to the
dialed string. Example 5-10 shows a BRI interface configuration.
ISDN BRI Configuration
Example 5-10
isdn switch-type basic-ni
!
interface BRI0
ip address 1.1.1.1 255.255.255.252
encapsulation ppp
dialer map ip 1.1.1.2 255.255.255.252 name R6 broadcast 2819970300101
dialer-group 1
isdn spid1 2816109420101
isdn spid2 2816109430101
ppp authentication chap
!
dialer-list 1 protocol ip permit
The configuration shows that the carrier's switch type is basic-ni, which is the national switch
type for the US. PPP encapsulation is for the ISDN B channels. The dialer map indicates that
the next hop IP address, 1.1.1.2 is reached through the ISDN service identifier 2819970300101.
The hostname of the next-hop router is R6, and IP broadcasts and directed IP packets are
forwarded to this IP address. The dialer group indicates that only IP packets are permitted to
activate the ISDN connection. ISDN service profile identifiers (SPID) are local identifiers
assigned by the ISDN carrier that are required for DMS-100 and NI switch types only. They
have significance at the local ISDN switch only and are required to start ISDN connections.
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