Cisco IOS Dial Technologies Configuration Guide, Release 12.2SR

Leased and Switched BRI Interfaces for
ETSI NET3

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Feature History

This document describes the Leased and Switched BRI Interfaces for ETSI NET3 feature. It includes the following sections:

• Feature Overview
• Supported Platforms
• Supported Standards, MIBs, and RFCs
• Prerequisites
• Configuration Tasks
• Monitoring and Maintaining Leased and Switched BRI Interfaces for ETSI NET3
• Configuration Examples
• Command Reference

Feature Overview

1. In most BRI configurations, both B channels of a leased-line service are used as point-to-point leased lines with the D channel disabled. Data transmission over the B channels is no different than data transmission over point-to-point leased lines.
2. A new feature available in Cisco IOS Release 12.2(4)T, Leased and Switched BRI Interfaces for ETSI NET3, allows one BRI B channel on a European Telecommunications Standards Institute (ETSI) NET3 switch to be configured as a leased line, and the second B channel to be configured as a standard ISDN or dial interface and used as a switched channel to the Public Switched Telephone Network (PSTN). When the Leased and Switched BRI Interfaces for ETSI NET3 feature is configured, one B channel functions as a point-to-point 64-kbps leased line and the other B channel functions as a circuit-switched channel using the D channel to provide the signaling features available for the ETSI NET3 signaling protocol.

Supported Platforms

• Cisco 800 series

Platform Support Through Feature Navigator

Cisco IOS software is packaged in feature sets that support specific platforms. To get updated information regarding platform support for this feature, access Feature Navigator. Feature Navigator dynamically updates the list of supported platforms as new platform support is added for the feature.

Feature Navigator is a web-based tool that enables you to quickly determine which Cisco IOS software images support a specific set of features and which features are supported in a specific Cisco IOS image.

To access Feature Navigator, you must have an account on Cisco.com. If you have forgotten or lost your account information, send a blank e-mail to cco-locksmith@cisco.com. An automatic check will verify that your e-mail address is registered with Cisco.com. If the check is successful, account details with a new random password will be e-mailed to you. Qualified users can establish an account on Cisco.com by following the directions at http://www.cisco.com/register.

Feature Navigator is updated when major Cisco IOS software releases and technology releases occur. As of May 2001, Feature Navigator supports M, T, E, S, and ST releases. You can access Feature Navigator at the following URL:

http://www.cisco.com/go/fn

Supported Standards, MIBs, and RFCs

Standards

None

MIBs

The fillin_isdnBearerEntry() – isdnBearerTable manipulation MIB function is supported. See the “RFCs” section for more information.

To obtain lists of supported MIBs by platform and Cisco IOS release, and to download MIB modules, go to the Cisco MIB website on Cisco.com at the following URL:

http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml

RFCs

• RFC 2127, ISDN Management Information Base using SMIv2

RFC 2127 states that the following be reported for the leased line B channel: The isdnBearerTable MIB entry for the leased line B channel will need to be altered, specifically the value of isdnBearerChannelType MIB will be set to leased(2). This alteration involves a function in isdn/sr_ietf_isdmib.c, namely the fillin_isdnBearerEntry() — isdnBearerTable manipulation MIB function.

• RFC 1573, Evolution of the Interfaces Group of MIB-II

RFC 1573 makes no explicit mention of changes to the ifEntry for a B channel set to leased line. It is proposed that the ifAdminStatus and ifOperStatus functions remain in the UP(1) state.

Prerequisites

Before starting the configuration tasks in this document, review the chapter “Configuring ISDN BRI” and the section “Configuring ISDN BRI for Leased-Line Service,” for more complete details on configuring a BRI. This chapter is in the part “ISDN Configuration” in the Cisco IOS Dial Technologies Configuration Guide , Release 12.2.

Configuration Tasks

See the following sections for configuration tasks for the Leased and Switched BRI Interfaces for ETSI NET3 feature. Each task in the list is identified as either required or optional:

• Configuring Leased and Switched BRI Interfaces for ETSI NET3 (required)
• Verifying Leased and Switched BRI Interfaces for ETSI NET3 (optional)

Verifying Leased and Switched BRI Interfaces for ETSI NET3

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Note In the following verification procedure, BRI channel B1(the BRI0:1 interface) is configured for leased-line service and channel B2 (the BRI0:2 interface) is configured for ISDN.

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To verify that each BRI channel is configured correctly, perform the following steps:

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Step 1 Enter the show isdn status EXEC command and check the value in The Free Channel Mask field to verify that only one channel has been allocated for ISDN. The Free Channel Mask field displays 0x80000000 when there is an active call. If no call is active, The Free Channel Mask field displays 0x80000001 and 0x80000002 for the B1 and B2 leased line configurations, respectively.

Router# show isdn status

 

Global ISDN Switchtype = basic-net3

ISDN BRI0 interface

dsl 0, interface ISDN Switchtype = basic-net3

Layer 1 Status:

ACTIVE

Layer 2 Status:

TEI = 124, Ces = 1, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED

I_Queue_Len 0, UI_Queue_Len 0

Layer 3 Status:

1 Active Layer 3 Call(s)

CCB:callid=8001, sapi=0, ces=1, B-chan=2, calltype=DATA

Active dsl 0 CCBs = 1

The Free Channel Mask: 0x80000000

Total Allocated ISDN CCBs = 1

 

Step 2 Enter the show dialer EXEC command to display dialer interface statistics. Check that there is no entry for the BRI0:1 interface in the display:

Router# show dialer

 

BRI0 - dialer type = ISDN

 

Dial String Successes Failures Last DNIS Last status

0 incoming call(s) have been screened.

0 incoming call(s) rejected for callback.

 

BRI0:2 - dialer type = ISDN

Idle timer (120 secs), Fast idle timer (20 secs)

Wait for carrier (30 secs), Re-enable (15 secs)

Dialer state is idle

 

Di1 - dialer type = DIALER PROFILE

Idle timer (6000 secs), Fast idle timer (20 secs)

Wait for carrier (30 secs), Re-enable (15 secs)

Dialer state is idle

Number of active calls = 0

 

Dial String Successes Failures Last DNIS Last status

5552000 0 0 never - Default

 

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Monitoring and Maintaining Leased and Switched BRI Interfaces for ETSI NET3

To monitor and maintain the BRI configurations, use the following commands in EXEC mode, as needed:

Configuration Examples

This section provides an example of how to configure the Leased and Switched BRI Interfaces for ETSI NET3 feature.

Command Reference

The following commands are introduced or modified in the feature or features documented in this module. For information about these commands, see the Cisco IOS Dial Technologies Command Reference at http://www.cisco.com/en/US/docs/ios/dial/command/reference/dia_book.html . For information about all Cisco IOS commands, go to the Command Lookup Tool at http://tools.cisco.com/Support/CLILookup or to the Cisco IOS Master Commands List .

• isdn leased-line bri

Glossary

European Telecommunications Standards Institute —See ETSI.

ETSI —European Telecommunications Standards Institute. Organization created by European Post, Telephone, and Telegraph (PTT) groups and the European Community (EC) to propose telecommunications standards for Europe.

leased line —Transmission line reserved by a communications carrier for the private use of a customer.

switched —General term applied to an electronic or mechanical device that allows a connection to be established as necessary and terminated when there is no longer a session to support.