can be configured at the global or interface command mode to specify the provider ISDN switch.

Configuring the isdn switch-type command in the global configuration mode sets the ISDN switch type identically for all ISDN interfaces. Individual interfaces may be configured, after the global configuration command, to reflect an alternate switch type.

When the ISDN service is installed, the service provider will issue information about the switch type and SPIDs. SPIDs are used to define the services available to individual ISDN subscribers. Depending on the switch type, these SPIDs may have to be added to the configuration. National ISDN-1 and DMS-100 ISDN switches require SPIDs to be configured, but the AT&T 5ESS switch does not. SPIDs must be specified when using the Adtran ISDN simulator.

The format of the SPIDs can vary depending on the ISDN switch type and specific provider requirements. Use the isdn spid1 and isdn spid2 interface configuration mode commands to specify the SPID required by the ISDN network when the router initiates a call to the local ISDN exchange.

Configuration of ISDN BRI is a mix of global and interface commands. To configure the ISDN switch type, use the isdn switch-type command in global configuration mode:

Router(config)#isdn switch-type switch-type

The argument switch-type indicates the service provider switch type. To disable the switch on the ISDN interface, specify isdn switch-type none. The following example configures the National ISDN-1 switch type in the global configuration mode:

Router(config)#isdn switch-type basic-ni

To define SPIDs use the isdn spid# command in interface configuration mode. This command is used to define the SPID numbers that have been assigned for the B channels:

Router(config-if)#isdn spid1 spid-number [ldn]
Router(config-if)#isdn spid2 spid-number [ldn]

The optional ldn argument defines a local dial directory number. On most switches, the number must match the called party information coming in from the ISDN switch. SPIDs are specified in interface configuration mode. To enter interface configuration mode, use the interface bri command in the global configuration mode:

Router(config)#interface bri slot/port
Router(config)#interface bri0/0
Router(config-if)#isdn spid1 51055540000001 5554000
Router(config-if)#isdn spid2 51055540010001 5554001

Lab Activity Lab Exercise: Configuring ISDN BRI (U-Interface) In this lab, the student will configure an ISDN router to make a successful connection to a local ISDN switch.

   

Web Links Configuring ISDN BRI http://www.cisco.com/en/US/products/sw/ iosswrel/ps1835/ products_configuration_guide_m chapter09186a00800ca71c.html