Leased and Switched BRI Interfaces for
ETSI NET3
Feature History
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12.2(4)T
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This feature was introduced on the Cisco 800 series routers.
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This document describes the Leased and Switched BRI Interfaces for ETSI NET3 feature. It includes the following sections:
Feature Overview
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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.
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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.
Benefits
The Leased and Switched BRI Interfaces for ETSI NET3 feature allows Internet service providers to split one ISDN line into a leased-line interface and a dialer interface, thereby increasing connection capability without increasing cost.
Restrictions
The following restrictions apply to the Leased and Switched BRI Interfaces for ETSI NET3 feature:
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Only the ETSI NET3 signaling protocol is supported at a line speed of 64 kbps.
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Only one ISDN call can be active at any time, and the call must verify that the leased line is not used to bring up a second call.
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The ETSI NET3 switch cannot be configured for a leased line when the U interface is used instead of the S/T interface; doing so prevents the line protocol from coming up.
Related Documents
-
Cisco IOS Dial Technologies Command Reference
, Release 12.2
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Cisco IOS Dial Technologies Configuration Guide
, “ISDN Configuration” part, Release 12.2
Supported Platforms
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
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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.
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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
To configure a BRI for both an ISDN connection and leased-line service, use the following commands in global configuration mode:
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Step 1
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Router(config)#
isdn switch-type basic-net3
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Configures the ETSI NET3 BRI switch type.
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Step 2
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Router(config)#
isdn leased-line bri
number
/
number
{
b1
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b2
}
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Splits a line for both ISDN and 64-kbps leased-line service.
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Verifying Leased and Switched BRI Interfaces for ETSI NET3
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.
To verify that each BRI channel is configured correctly, perform the following steps:
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.
Global ISDN Switchtype = basic-net3 dsl 0, interface ISDN Switchtype = basic-net3 TEI = 124, Ces = 1, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED I_Queue_Len 0, UI_Queue_Len 0 CCB:callid=8001, sapi=0, ces=1, B-chan=2, calltype=DATA 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:
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) Di1 - dialer type = DIALER PROFILE Idle timer (6000 secs), Fast idle timer (20 secs) Wait for carrier (30 secs), Re-enable (15 secs) Number of active calls = 0 Dial String Successes Failures Last DNIS Last status 5552000 0 0 never - Default
Troubleshooting Tips
To test the BRI configurations, use the following commands in EXEC mode, as needed:
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Router#
show controllers bri
number
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Checks Layer 1 of the BRI.
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Router#
debug q921
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Checks Layer 2 of the BRI.
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Router#
debug dialer
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Checks dialer events on the BRI.
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Router#
debug isdn events
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Checks call control events on the BRI.
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Router#
debug q931
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Checks Layer 3 of the BRI.
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Refer to the
Cisco
IOS Debug Command Reference
for more information about the
debug
commands.
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:
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Router#
show isdn status
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Displays Layer 1, Layer 2, and Layer 3 status of the D channel and channel mask information.
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Router#
show interfaces bri
x
:
y
status
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Displays status of the ISDN BRI channel configured as either a leased line or dialer B-channel interface.
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Router#
show dialer
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Displays status of the ISDN BRI channel configured as a dialer interface.
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Configuration Examples
This section provides an example of how to configure the Leased and Switched BRI Interfaces for ETSI NET3 feature.
Leased and Switched BRI Interfaces for ETSI NET3 Example
The following example configures BRI channel B2 for 64-kbps leased-line service and channel B1 for ISDN service:
isdn leased-line bri0/0 b2 ip address 10.1.1.1 255.255.255.0 ip address 10.1.1.2 255.255.255.0
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.
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Any Internet Protocol (IP) addresses used in this document are not intended to be actual addresses. Any examples, command display output, and figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses in illustrative content is unintentional and coincidental.
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