4000 Router Series Layer 2 - WAN Configuration Guide

# Apply the ISDN NI protocol on interface BRI 2/0, assign the SPID 54321 to the B1 channel and

SPID 65432 to the B2 channel on the interface, and set the negotiation message to be resent twice

when no reply exists.

[RouterA-Bri2/0] isdn protocol-type ni

[RouterA-Bri2/0] isdn spid1 54321

[RouterA-Bri2/0] isdn spid2 65432

[RouterA-Bri2/0] isdn spid resend 2

2. Configure Router B:

# Create dialer access group 1 and configure a dial access rule to trigger calls for IP packets.

<RouterB> system-view

[RouterB] dialer-group 1 rule ip permit

# Assign interface BRI 2/0 an IP address, enable C-DDR on the interface, dial 8810152 to set up

a link for packets destined to host address 202.38.154.1, and add the interface to dialer access

group 1.

[RouterB] interface bri 2/0

[RouterB-Bri2/0] ip address 202.38.154.2 255.255.0.0

[RouterB-Bri2/0] dialer circular enable

[RouterB-Bri2/0] dialer route ip 202.38.154.1 8810152

[RouterB-Bri2/0] dialer-group 1

# Apply the ISDN NI protocol on interface BRI 2/0, assign the SPID 12345 to the B1 channel and

SPID 23456 to the B2 channel on the interface, and set the negotiation message to be resent twice

when no reply exists.

[RouterB-Bri2/0] isdn protocol-type ni

[RouterB-Bri2/0] isdn spid1 12345

[RouterB-Bri2/0] isdn spid2 23456

[RouterB-Bri2/0] isdn spid resend 2

3. Verify the configuration:

a. Ping 202.38.154.2 on Router A to trigger a call. The log shows that the line for a B channel

on interface BRI 2/0 is up.

b. Ping 202.38.154.2, and the attempt succeeds. No packet is lost.

Troubleshooting

Symptom

Two devices interconnected through an ISDN PRI or BRI line cannot ping each other.

Analysis

The causes may be:

• The interface is not configured or activated.

• The dial-up configuration is incorrect.

• The line is not well connected.

Solution

• Execute the display isdn call-info command. No display indicates no ISDN PRI exists. The interface

must be configured. For more information about configuring CE1/PRI and CT1/PRI interfaces, see

Interface Configuration Guide. If ISDN is not in the multi-frame operation status on a PRI, or if ISDN