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The debug isdn q921 command may also be used to troubleshoot Layer 2 issues between the

router and the ISDN switch.

Once connectivity to the ISDN switch has been verified, issue the show interface bri0/0

command, as follows:

SanJose1#show interface bri0/0

BRI0/0 is up, line protocol is up (spoofing)

Hardware is PQUICC BRI with U interface

Internet address is 10.1.1.1/24

MTU 1500 bytes, BW 64 Kbit, DLY 20000 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation PPP, loopback not set

The highlighted portion of the output shows that the BRI0/0 interface is up and the line protocol is up

or spoofing.

1. Since no ISDN call has been made yet, why did the BRI show “up and up” (spoofing)?

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Now issue the show ip interface brief command, as follows:

SanJose1#show ip interface brief

Interface IP-Address OK? Method Status Protocol

FastEthernet0/0 192.168.0.1 YES manual up up

Serial0/0 unassigned YES unset down down

BRI0/0 192.168.16.1 YES manual up up

BRI0/0:1 unassigned YES unset down down

BRI0/0:2 unassigned YES unset down down

Serial0/1 unassigned YES unset down down

2. What do BRI0/0:1 and BRI0/0:2 refer to?

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3. Why is BRI0/0 up, and BRI0/0:1 down?

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Issue the show dialer command. The following shows a sample output:

SanJose1#show dialer

BRI0/0 - 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.

BRI0/0:1 - dialer type = ISDN

Idle timer (120 secs), Fast idle timer (20 secs)

Wait for carrier (30 secs), Re-enable (15 secs)

Dialer state is idle

BRI0/0:2 - dialer type = ISDN

4 - 7 CCNP 2: Remote Access v 3.0 - Lab 4.9.1 Copyright  2003, Cisco Systems, Inc.

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