Cisco 2501 User Guide - Page 74

Configuring ISDN Step 6 Step 7 Step 8 If you are using an ISDN switch type (such as Basic NI1 or DMS-100) that requires a service profile identifier (SPID), enter the SPID and optional local directory number (LDN). The SPID and LDN are assigned by the ISDN service provider. The SPID is a number that identifies the service to which you have subscribed. A SPID is not required for AT&T 5ESS service configured for a point-to-point connection. The LDN is an optional seven-digit phone number for the channel. Router (config-if)# isdn spid1 SPID_no [LDN] Router (config-if)# isdn spid2 SPID_no [LDN] Configure the router for PPP encapsulation and CHAP authentication: Router (config-if)# encapsulation ppp Router (config-if)# ppp authentication chap Enter the load-threshold or ppp multilink command to set up a second B channel. For bandwidth on demand, enter the load-threshold command to set the ISDN load threshold. The load threshold determines the percentage of network load at which the second ISDN B channel is activated. The value ranges from 1 to 255 (100 percent). In the following example, the value of 128 means that when the first B channel reaches 50 percent of its bandwidth capacity (128 equals 50 percent of 255), the second B channel will activate to assist with the bandwidth load: Router (config-if)# dialer load-threshold 128 Alternatively, you can use Multilink PPP to activate a second ISDN line. For Multilink PPP to work, the router must be running Cisco IOS Release 11.0(3) or a later release, and both the current router and target router must support Multilink PPP: Router (config-if)# ppp multilink 4-20 Router Installation and Configuration Guide