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Chapter 8

Troubleshooting ISDN

00:21:23: BR0:1 LCP: O ECHOREP [Open] id 12 len 12 magic
0x5020C645

00:21:23: BR0:2 PPP: I pkt type 0xC021, datagramsize 16

00:21:23: BR0:2 LCP: I ECHOREQ [Open] id 12 len 12 magic
0x5020CD0D

00:21:23: BR0:2 LCP: O ECHOREP [Open] id 12 len 12 magic
0x5020CD1B

00:21:24: BR0:2 PPP: I pkt type 0x0207, datagramsize 15

00:21:25: BR0:2 PPP: I pkt type 0x0207, datagramsize 312

00:21:25: %ISDN-6-DISCONNECT: Interface BRI0:1
disconnected from 18008358661 To p, call lasted 120
seconds

00:21:25: %LINK-3-UPDOWN: Interface BRI0:1, changed state
to down

00:21:107379488949: %ISDN-6-DISCONNECT: Interface BRI0:2
disconnected from 8358 663 , call lasted 120 seconds

00:21:25: %LINK-3-UPDOWN: Interface BRI0:2, changed state
to down

00:21:26: %LINEPROTO-5-UPDOWN: Line protocol on Interface
BRI0:1, changed state to down

00:21:26: %LINEPROTO-5-UPDOWN: Line protocol on Interface
BRI0:2, changed state to down

debug isdn q931

The q.931 specification addresses Layer 3 of the OSI model for ISDN. Events
occurring at Layer 3 may be monitored with the debug isdn q931 command.
In the following output, the two B channels are disconnected.

The output from this command is best compared to a baseline debug

captured on a working connection. However, administrators may use the
output to verify acknowledgments and messages without a complete
understanding of the protocol. There is a great deal of information pro-
vided by the following command. However, it can be used to verify the
Layer 3 (q.931) setup described earlier in the chapter.

Bottom#debug isdn q931

ISDN Q931 packets debugging is on

00:15:184683593728: ISDN BR0: RX <- STATUS_ENQ pd = 8
callref = 0x82

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