Cisco Cisco IOS Software Release 12.4(6)T
Packet Mode Services on D Channel
isdn x25 dchannel
7
Cisco IOS Release 12.4(6)T
isdn x25 dchannel
To create a configurable interface for X.25 traffic over the ISDN D channel, use the isdn x25 dchannel
command in interface configuration mode. To remove the interface, use the no form of this command.
command in interface configuration mode. To remove the interface, use the no form of this command.
isdn x25 dchannel [q931-broadcast]
no isdn x25 dchannel [q931-broadcast]
Syntax Description
Defaults
Command is disabled
Command Modes
Interface configuration
Command History
Usage Guidelines
This command creates a new, configurable interface, which can be specified as interface brix:0 in
commands, where x is the original BRI interface number. For example, on a Cisco 4500 router with an
MBRI, if the isdn x25 dchannel command is configured on interface BRI 5, the new interface is bri5:0
and can be used for configuring the other parameters for X.25 over the D channel. These parameters
include the addresses and the map statements. To display the new interface, use the
more system:running-config command.
commands, where x is the original BRI interface number. For example, on a Cisco 4500 router with an
MBRI, if the isdn x25 dchannel command is configured on interface BRI 5, the new interface is bri5:0
and can be used for configuring the other parameters for X.25 over the D channel. These parameters
include the addresses and the map statements. To display the new interface, use the
more system:running-config command.
The optional q931-broadcast keyword is supported only on the ISDN BRI interface user side. Although
regular X.25 and ISDN configuration commands may be sufficient to enable this feature, the Japanese
NTT ISDN switch types expect the same TEI to be shared. By default, Cisco gateways will try to use
two different TEIs and expect the switch to establish an X.25 link on the TEI that responds. The Japanese
NTT switch does not follow this procedure and expects the Cisco router to share the same TEI. Cisco
recommends that deployments interworking with the Japanese NTT switch type use the optional
q931-broadcast keyword to enable sharing of the TEI and avoid interworking incompatibilities. The
optional q931-broadcast keyword can also be used in configurations for other switch types such as the
European NET3 that require sharing of the TEIs.
regular X.25 and ISDN configuration commands may be sufficient to enable this feature, the Japanese
NTT ISDN switch types expect the same TEI to be shared. By default, Cisco gateways will try to use
two different TEIs and expect the switch to establish an X.25 link on the TEI that responds. The Japanese
NTT switch does not follow this procedure and expects the Cisco router to share the same TEI. Cisco
recommends that deployments interworking with the Japanese NTT switch type use the optional
q931-broadcast keyword to enable sharing of the TEI and avoid interworking incompatibilities. The
optional q931-broadcast keyword can also be used in configurations for other switch types such as the
European NET3 that require sharing of the TEIs.
You can verify the X.25 call accept procedure using the debug isdn events, debug isdn command with
the optional mgmnt keyword, and debug isdn q931 EXEC commands.
the optional mgmnt keyword, and debug isdn q931 EXEC commands.
q931-broadcast
(Optional) Enables a gateway to share the same terminal endpoint identifier (TEI)
for sending X.25 Set Asynchronous Balanced Mode Extended (SABME) and ITU
Q.931 packet mode responses.
for sending X.25 Set Asynchronous Balanced Mode Extended (SABME) and ITU
Q.931 packet mode responses.
Release
Modification
11.2F
This command was introduced.
12.4(6)T
This command was enhanced with the optional q931-broadcast keyword to
enable the ITU Q.931 service access point identifier (SAPI) value 16 procedures
for call setup that accepts X.25 calls on the BRI D channel on Japanese and some
European telephone switches that require that procedure.
enable the ITU Q.931 service access point identifier (SAPI) value 16 procedures
for call setup that accepts X.25 calls on the BRI D channel on Japanese and some
European telephone switches that require that procedure.