Configuration Prerequisites; Configuration Procedure - HP MSR Router Series Configuration Manual

Figure 2 Referential ISDN user-network interface configuration

Configuration prerequisites

Before you configure an ISDN BRI interface, verify the following items:
Interface type (ISDN BRI U or ISDN BRI S/T) provided by your telecom service provider—You must
•
identify this information before you purchase a router. You must perform this task because the UNI
implementation of a service provider might deviate from ITU-T I.41 1.
Availability of digital service—The router requires digital transmission. You must subscribe to the
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digital call service for an ISDN line.
Connection type (point-to-point or point-to-multipoint)—Because ISDN supports semi-permanent
•
connections, you can use an ISDN leased line to connect two permanent points. To connect more
than two points, use a point-to-multipoint connection.
Availability of the calling line identification function—This function can filter calling numbers on an
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ISDN line to block unauthorized users from the router.

Configuration procedure

ISDN BRI interfaces are used for dialup purposes. For more information about dial-up configuration, see
Layer 2—WAN Configuration Guide.
To configure an ISDN BRI interface:
Step
1. Enter system view.
2. Enter ISDN BRI interface view.
3. (Optional.) Configure the
interface description.
4. (Optional.) Enable external
loopback on the ISDN BRI
interface.
5. Set the MTU for the BRI
interface.
6. Set the keepalive transmission
interval.
Command
system-view
interface bri number
description text
loopback { b1 | b2 | both }
mtu size
timer-hold seconds
20
Remarks
N/A
N/A
By default, the description of an
interface is interface-name
Interface, for example, Bri2/4/0
Interface.
By default, external loopback is
disabled on the ISDN BRI interface.
The default is 1500 bytes.
The default is 10 seconds.