Router Card (WS-X3011) Configuration Note 29
Configuring ISDN
To display the current running configuration, enter the show running-config command. Enter the
copy running-config startup-config command to save the current running configuration to the
startup configuration file in NVRAM.
Router> enable
Router# copy running-config startup-config
To display the startup configuration, enter the show startup-config command. Enter the copy
startup-config running-config command to write the startup configuration to the running
configuration:
Router> enable
Router# copy startup-config running-config
To erase both configuration files (and start over), enter the write erase and reload commands:
Router> enable
Router# write erase
Router# reload
Caution
This command sequence will erase the entire router configuration in RAM and NVRAM
and reload the router.
Configuring ISDN
This section describes a typical ISDN configuration for one or two B channels. In the examples that
follow, the BRI port is configured for IP routing, Challenge Handshake Authentication Protocol
(CHAP), and Point-to-Point Protocol (PPP) encapsulation.
For your reference, an example configuration follows in the next section, “Example ISDN
Configuration.” You may want to refer to it during this procedure.
Take the following steps to configure the router for a basic ISDN PPP connection on a single
B channel or two B channels, substituting the correct addresses and host names as appropriate for
your network:
Step 1
Enter privileged EXEC mode:
Router> enable
password:
enablepassword
Step 2
Enter the configure terminal command to enter global configuration mode. Then enter
the host name of the current router, the user name of the target router (the router to which
packets will be sent), and the password that the routers will use for CHAP caller
identification. The user name and password are case sensitive and must match the host
name and password of the target router (even if it is not a Cisco router):
Router# configure terminal
Router (config)# hostname
currentrouter
Router (config)# username
targetrouter password abc
Step 3
Enter the isdn switch-type command to configure the ISDN switch type (such as
basic-5ess, basic-dms100, or basic-ni1). Refer to Table 7, earlier in this chapter, for a list
of ISDN switch types supported.
Router (config)# isdn switch-type
switch-type
