Leased-Line ISDN at 128 kbps

Description

In Cisco IOS Release 11.2, leased-line service at 64 kbps via ISDN BRI is provided in Japan and Germany. Configuration of this feature is described in the Wide-Area Networking Configuration Guide for Cisco IOS Release 11.2.

Beginning in Cisco IOS Release 11.2(3)F, leased-line service at 128 kbps via ISDN BRI is provided in Japan. This service combines two B channels into a single pipe.

Note Once an ISDN BRI interface is configured for access over leased lines, it is no longer a dialer interface, and signaling over the D channel no longer applies. Although the interface is called interface bri n, it is configured as a synchronous serial interface. However, the Cisco IOS commands that set the physical characteristics of a serial interface (such as the pulse time) do not apply to this interface.

Platforms

This feature is supported on these platforms:

Cisco 1003, Cisco 1004
Cisco 4000 series (Cisco 4000, 4000-M, 4500, 4500-M, 4700, 4700-M)

The Cisco 2500 series does not support this feature because its BRI hardware does not support channel aggregation.

Prerequisites

This feature requires the following:

One or more ISDN BRI hardware interfaces that support channel aggregation.
Service provider support for ISDN channel aggregation at 128 kbps; currently offered in Japan.

Configuration Tasks

To enable leased-line service at 128 kbps on a specified ISDN BRI, complete the following tasks in global configuration mode:

Task	Command
Select the service provider switch type.	isdn switch-type switch-type
Configure a specified BRI for access over leased lines.	isdn leased-line bri number 128

To complete the configuration of the interface, see the "Configure a Synchronous Serial Interface" section in the "Configuring Interfaces" chapter of the Configuration Fundamentals Configuration Guide for Cisco IOS Release 11.2. For an example configuration, see the "Configuration Examples" section.

To remove the leased-line service configuration from a specified ISDN BRI, complete the following task in global configuration mode:

Task	Command
Remove leased line configuration from a specified ISDN BRI interface.	no isdn leased-line bri number

Configuration Examples

The following example configures the BRI 0 interface for leased-line access at 128 kbps in Japan. Because of the leased-line--not dialed--environment, configuration of ISDN called and calling numbers is not needed and not used. The BRI 0 interface is henceforth treated as a synchronous serial interface, with the default HDLC encapsulation.

isdn leased-line bri 0 128

The following example configures the BRI 0 interface for PPP encapsulation:

interface bri 0
ip address 1.1.1.2 255.255.255.0
encapsulation ppp
bandwidth 128

Command Reference

This section documents the new isdn leased-line bri 128 command used to configure ISDN BRI leased-line service at 128 kbps.

isdn leased-line bri 128

To configure an ISDN BRI for leased-line service at 128 kbps, use the isdn leased-line bri 128 global configuration command.

isdn leased-line bri number 128

Syntax Description

number

BRI interface number.

Default

Disabled

Command Mode

Global configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 11.2 F.

Use this command to aggregate two B channels into a single pipe at a speed of 128 kbps. This service is available only for ISDN BRI.

When you use an ISDN BRI interface for access over leased lines, configure the ISDN BRI as a synchronous serial interface. Do not configure ISDN calling and called numbers.

Examples

isdn leased-line bri 0 128

The following example configures the BRI 0 interface for PPP encapsulation:

interface bri 0
ip address 1.1.1.2 255.255.255.0
encapsulation ppp
bandwidth 128

Related Command

isdn switch-type

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