Summary

This chapter covered the theory and configuration of ISDN. ISDN has numerous advantages over the traditional analog service while maintaining the investment in existing technology and providing high-speed service at a low cost. ISDN requires proper configuration for you to make the most of its services and avoid pitfalls. In this chapter, you learned how to enable legacy ISDN. You also saw the use of some PPP and DDR techniques and how they relate to ISDN. Table 6-4 summarizes the ISDN commands used in this chapter.

Table 6-4. Summary of ISDN Commands Used in This Chapter
Command
Description
isdn switch-type switch-identifier
Specifies the central office switch type on the ISDN interface.
interface bri number
Configures a BRI interface and enters interface configuration mode.
encapsulation ppp
Enables PPP encapsulation on an interface.
ppp authentication {pap | chap} [callin]
Enables PPP authentication and specifies the type.
ppp chap hostname alternate-host-name
Allows CHAP authentication through a name other than the host name.
dialer idle-timeout seconds [inbound | either]
Specifies the duration of idle time before a line is disconnected.
dialer map protocol next-hop-address [name hostname] [speed speed] [broadcast] dial-string
Configures a serial interface or ISDN interface to call one or multiple sites or to receive calls from multiple sites.
dialer-list dialer-group-number protocol protocol-name {{permit | deny} | list access-list-number}
Defines a DDR dialer list for dialing by protocol or by a combination of a protocol and a previously defined access list.
dialer-group dialer-group-number
Controls access by configuring an interface to belong to a specific dialing group.
isdn spid {1 | 2} spid-number [ldn]
Associates ISDN LDNs provided by your telephone service provider to the SPID.
framing {sf | esf | crc4 | no-crc4}
Selects the frame type for the T1 or E1 data line.
linecode {ami | b8zs | hdb3}
Defines the line code.
clock source {line [primary | secondary] | internal}
Sets the E1 line clock source for the Cisco AS5200 access server.
pri-group timeslots range
Specifies the channels to be controlled by the primary D channel.
interface serial {slot/port: | unit :}{23 | 15}
Specifies a serial interface created on a channelized E1 or channelized T1 controller (for ISDN PRI, channel-associated signaling or robbed-bit signaling).
ip route destination-network destination-subnet-mask{local-interface | next-hop} [administrative-distance]
Establishes static routes and defines the next hop for large-scale dial-out.
backup interface interface number
Configures an interface as a secondary or dial backup.
backup delay activation-time deactivation-time
Defines how much time should elapse before a secondary line status changes after a primary line status has changed.
backup load activation-percentage deactivation-percentage
Sets a traffic load threshold for dial backup service.
isdn caller number [callback] [exact]
Configures ISDN caller ID screening and optionally enables ISDN caller ID callback for legacy DDR.
isdn answer {1 | 2} called-party-number
Forces the router to verify a called-party number or subaddress number in the incoming setup message for ISDN BRI calls if the number is delivered by the switch.
show isdn status
Displays the status of all ISDN interfaces.
show interface interface
Displays information about the physical attributes of the ISDN interface.
show controller {t1 slot/port | bri}
Displays information about the ISDN PRI or BRI.
debug isdn q921
Monitors the ISDN connection in real time.

Table 6-4. Summary of ISDN Commands Used in This Chapter
Command	Description
isdn switch-type switch-identifier	Specifies the central office switch type on the ISDN interface.
interface bri number	Configures a BRI interface and enters interface configuration mode.
encapsulation ppp	Enables PPP encapsulation on an interface.
ppp authentication {pap \| chap} [callin]	Enables PPP authentication and specifies the type.
ppp chap hostname alternate-host-name	Allows CHAP authentication through a name other than the host name.
dialer idle-timeout seconds [inbound \| either]	Specifies the duration of idle time before a line is disconnected.
dialer map protocol next-hop-address [name hostname] [speed speed] [broadcast] dial-string	Configures a serial interface or ISDN interface to call one or multiple sites or to receive calls from multiple sites.
dialer-list dialer-group-number protocol protocol-name {{permit \| deny} \| list access-list-number}	Defines a DDR dialer list for dialing by protocol or by a combination of a protocol and a previously defined access list.
dialer-group dialer-group-number	Controls access by configuring an interface to belong to a specific dialing group.
isdn spid {1 \| 2} spid-number [ldn]	Associates ISDN LDNs provided by your telephone service provider to the SPID.
framing {sf \| esf \| crc4 \| no-crc4}	Selects the frame type for the T1 or E1 data line.
linecode {ami \| b8zs \| hdb3}	Defines the line code.
clock source {line [primary \| secondary] \| internal}	Sets the E1 line clock source for the Cisco AS5200 access server.
pri-group timeslots range	Specifies the channels to be controlled by the primary D channel.
interface serial {slot/port: \| unit :}{23 \| 15}	Specifies a serial interface created on a channelized E1 or channelized T1 controller (for ISDN PRI, channel-associated signaling or robbed-bit signaling).
ip route destination-network destination-subnet-mask{local-interface \| next-hop} [administrative-distance]	Establishes static routes and defines the next hop for large-scale dial-out.
backup interface interface number	Configures an interface as a secondary or dial backup.
backup delay activation-time deactivation-time	Defines how much time should elapse before a secondary line status changes after a primary line status has changed.
backup load activation-percentage deactivation-percentage	Sets a traffic load threshold for dial backup service.
isdn caller number [callback] [exact]	Configures ISDN caller ID screening and optionally enables ISDN caller ID callback for legacy DDR.
isdn answer {1 \| 2} called-party-number	Forces the router to verify a called-party number or subaddress number in the incoming setup message for ISDN BRI calls if the number is delivered by the switch.
show isdn status	Displays the status of all ISDN interfaces.
show interface interface	Displays information about the physical attributes of the ISDN interface.
show controller {t1 slot/port \| bri}	Displays information about the ISDN PRI or BRI.
debug isdn q921	Monitors the ISDN connection in real time.

[ LiB ]