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The Multiple ISDN Switch Types feature allows you to configure more than one ISDN switch type per router. You can apply an ISDN switch type on a per interface basis, thus extending the existing global isdn switch-type command to the interface level. This allows Basic Rate Interfaces (BRI) and Primary Rate Interfaces (PRI) to run simultaneously on platforms that support both interface types.
The isdn tei command is also extended to the interface level. Terminal endpoint negotiation (TEI) determines when Layer 2 is activated (powerup or first-call).
This document does not include information about basic configuration and set up of BRI and PRI interfaces for ISDN services. Refer to the Cisco IOS Release 11.3 Dial Solutions Configuration Guide for information on how to configure ISDN services for these interface types.
Multiple ISDN Switch Types provides the following advantages:
Autoconfigure, leased line, X.25 over D-Channel, PRI NFAS, and PRI D channel backup service offerings are not affected by this feature.
Basic Rate Interface (BRI)--An ISDN interface composed of two B channels and one D channel for circuit-switched communication of voice, video, and data.
bearer channel (B Channel)--A channel that carries data on the ISDN interface.
Integrated Services Digital Network (ISDN)--Communication protocols offered by telephone companies that permit telephone networks to carry data, voice, and other source traffic.
Non-Facility Associated Signaling (NFAS)--An ISDN service that allows a single D channel to control multiple PRI interfaces. Use of a single D channel to control multiple PRI interfaces can free one B channel on each interface to carry other traffic.
Primary Rate Interface (PRI)--An ISDN interface to primary rate access. Primary rate access consists of a single 64-kpbs D channel plus 23 (T1) or 30 (E1) B channels.
signaling channel (D Channel)--A channel used to carry control signals on the ISDN interface.
The following restrictions apply to Multiple ISDN Switch Types:
| Global Switch Type | BRI Interface | PRI Interface |
|---|---|---|
| basic-net3 | basic-net3 | primary-net5 |
| primary-ts014 | basic-ts013 | primary-ts014 |
| primary-ni | basic-ni | primary-ni |
If, for example, you reconfigure the router to use global switch type basic-net3, the router will apply a primary-net5 switch type to PRI interfaces and basic-net3 to any BRI interfaces. You can override the default switch assignment by configuring a different ISDN switch type on the associated interface.
This feature is supported on these platforms:
None
Perform the following tasks to configure Multiple ISDN Switch Types. All tasks are required except the last task to configure TEI negotiation.
A global ISDN switch type is required and must be configured on the router before you can configure a switch type on an interface. To configure a global ISDN switch type, perform the following task in global configuration mode:
| Task | Command |
|---|---|
| Apply a global ISDN switch type. | isdn switch-type switch-type |
You must ensure that both global and interface level ISDN switch types are valid for the ISDN interfaces on the router. Table 1 lists valid ISDN switch types for BRI and PRI interfaces.
To configure the ISDN switch type on a BRI or PRI interface, perform the following task in interface configuration mode:
| Task | Command |
|---|---|
| Apply the ISDN switch type to the interface. | isdn switch-type switch-type |
Table 1 lists valid ISDN switch types for BRI and PRI interfaces.
| Keyword | Switch Type |
| ISDN BRI | |
| basic-ts013 | Australian TS013 switches |
| basic-1tr6 | German 1TR6 ISDN switches |
| basic-net3 | NET3 ISDN, Norway NET3, and New Zealand NET3 switches (covers the Euro-ISDN E-DSS1 signaling system and is ETSI-compliant) |
| vn3 | French VN3 and VN4 ISDN BRI switches |
| ntt | Japanese NTT ISDN switches |
| basic-5ess | AT&T basic rate switches |
| basic-dms100 | NT DMS-100 basic rate switches |
| basic-ni | National ISDN switches |
| ISDN PRI | |
| primary-net5 | European, New Zealand and Asia ISDN PRI switches (covers the Euro-ISDN E-DSS1 signaling system and is ETSI-compliant) |
| primary-ntt | Japanese ISDN PRI switches |
| primary-4ess | AT&T 4ESS switch type for the U.S. |
| primary-5ess | AT&T 5ESS switch type for the U.S. |
| primary-dms100 | NT DMS-100 switch type for the U.S. |
| primary-ni | AT&T National ISDN switch type |
| primary-ts014 | Australia PRI switches |
You can configure ISDN terminal endpoint identifier (TEI) negotiation on individual ISDN interfaces. TEI negotiation is useful for switches that may deactivate Layers 1 or 2 when there are no active calls. Typically, this setting is used for ISDN service offerings in Europe and connections to dms100 switches that are designed to initiate TEI negotiation.
By default, TEI negotiation occurs when the router is powered on. The TEI negotiation value configured on an interface overrides the default or global TEI value. For example, if you configure isdn tei first-call globally and isdn tei powerup on BRI interface 0, then TEI negotiation powerup is the value applied to BRI interface 0. It is not necessary to configure TEI negotiation unless you wish to override the default value (isdn tei powerup). On PRI interfaces connecting to dms100 switches, the router will change the default TEI setting to isdn tei first-call. To apply TEI negotiation to a specific BRI interface, perform the following task in interface configuration mode:
| Task | Command |
|---|---|
| Determine when ISDN TEI negotiation occurs. | isdn tei [first-call | powerup] |
This section provides the following ISDN switch configuration examples:
The following example shows the global ISDN switch type of basic-ni and an interface level switch type of basic-net3. ISDN switch type basic-net3 is applied to BRI interface 0 and overrides the global switch setting.
isdn switch-type basic-ni
!
interface BRI0
isdn switch-type basic-net3
The following example shows the global ISDN switch type of basic-ni that is applied to BRI interface 0. The PRI interface (channelized T1 controller), is configured for ISDN switch type primary-net5 and is applied only to the PRI interface.
isdn switch-type basic-ni
!
interface serial0:23
! Apply the primary-net5 switch to this interface only
isdn switch-type primary-net5
In this example, the global ISDN switch type setting is basic-net3. The PRI interface (channelized T1 controller), is configured to use isdn switch-type primary-net5. BRI interface 0 is configured for isdn switch-type basic-ni and isdn tei first-call. TEI first-call negotiation configured on BRI interface 0 overrides the default value (isdn tei powerup).
isdn switch-type basic-net isdn switch-type basic-ni
!
interface serial0:23
isdn switch-type primary-net5
ip address 172.21.24.85 255.255.255.0
!
interface BRI0
isdn tei first-call
This section documents existing global configuration commands that are now configurable at the interface level for ISDN interfaces. All other commands used with this feature are documented in the Cisco IOS Release 11.3 command references.
To add an ISDN switch type to a BRI or PRI interface, use the isdn switch-type interface configuration and global configuration command. To disable the switch on an ISDN interface, use the no form of this command.
isdn switch-type switch-type| switch-type | Central office or ISDN service provider switch type. See Table 1 for valid ISDN switch types for BRI and PRI interfaces. |
Disabled
Interface configuration and global configuration
This command first appeared as an interface configuration command in Cisco IOS Release 11.3 T.
This command first appeared as a global configuration command in Cisco IOS Release 9.1.
This is command allows the isdn switch-type to be applied either globally or at the interface level for BRI and PRI interfaces.
A global ISDN switch type should be added before you apply a switch type to a BRI or PRI interface.
You may change the interface level ISDN switch type by typing in the new switch type value. If you change the global ISDN switch type, the new value is not propagated to the interface level. You must therefore, change the ISDN switch type on all applicable interfaces.
You do not need to reload the router if you change the ISDN switch type.
If you disable the switch type from the ISDN interface using the no isdn switch-type command, and you do not add a new switch type value, you should shut down that interface using the shut command until you reconfigure the interface with a new ISDN switch type. Global ISDN switch type values are not propagated to the interface level if they are changed or removed; therefore, shutting down the interface prevents the interface being in an unconfigured state.
The following example applies global isdn switch-type basic-ni and isdn switch-type primary-ni to the PRI interface (channelized T1 controller):
isdn switch-type basic-ni
!
interface serial0:23
isdn switch-type primary-ni
To configure when Layer 2 becomes active and ISDN terminal endpoint identifier (TEI) negotiation occurs, use the isdn tei interface configuration and global configuration command. To remove TEI negotiation from an interface, use the no form of this command.
isdn tei [first-call | powerup]
no isdn tei
| first-call | (Optional) ISDN TEI negotiation should occur when the first ISDN call is placed or received. |
| powerup | (Optional) ISDN TEI negotiation should occur when the router is powered on. |
powerup
Interface configuration and global configuration
This command first appeared as an interface level configuration command in Cisco IOS Release 11.3 T.
This command first appeared as a global configuration command in Cisco IOS Release 9.21.
This command determines when Layer 2 is activated on ISDN interfaces.
The default value is TEI powerup; however, the router will change the value to first-call on PRI interfaces using a primary-dms100 switch type.
This command is useful for switches that may deactivate Layers 1 and 2 when there are no active calls, or primary-dms100 switches which activate TEI when the first ISDN call is placed or received.
The following example applies isdn tei first-call to BRI interface 0. BRI interface 1 will use isdn tei negotiation powerup, which is the default setting. Default settings do not appear in the router configuration.
isdn switch-type basic-net
!
interface bri0
! Configure the ISDN switch type on this interface and set TEI negotiation to
! first-call
isdn switch-type basic-ni
isdn tei first-call
! BRI interface 1 uses the default TEI negotiation value
interface bri1
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