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Chapter 8
Troubleshooting ISDN
00:16:44: Cause i = 0x8090 - Normal call clearing
00:16:188978561024: ISDN BR0: RX <- RELEASE pd = 8
callref = 0x06
00:16:44: %LINK-3-UPDOWN: Interface BRI0:2, changed state
to down
00:16:44: ISDN BR0: TX -> RELEASE_COMP pd = 8 callref =
0x86
00:16:45: %LINEPROTO-5-UPDOWN: Line protocol on Interface
BRI0:1, changed state to down
00:16:45: %LINEPROTO-5-UPDOWN: Line protocol on Interface
BRI0:2, changed state to down
debug ppp packet
The debug ppp packet command reports real-time PPP packet flow,
including the type of packet and the specific B channel used. Although
this command generates a significant amount of output, it is quite useful
for locating errors that involve upper-layer protocols.
As with other debug packet commands, the debug ppp packet command
records each packet that moves through the router using PPP. As such, the
administrator can monitor traffic flows as if they had a protocol analyzer
attached to the interface. This may be useful for troubleshooting Application
layer problems, but a formal protocol analyzer is highly recommended.
Bottom#debug ppp packet
PPP packet display debugging is on
Bottom#ping 10.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.1.1.1, timeout is 2
seconds:
00:24:49: %LINK-3-UPDOWN: Interface BRI0:1, changed state
to up.
00:24:50: BR0:1 LCP: O CONFREQ [Closed] id 4 len 10
00:24:50: BR0:1 LCP: MagicNumber 0x5025BF23
(0x05065025BF23)
00:24:50: BR0:1 PPP: I pkt type 0xC021, datagramsize 14
00:24:50: BR0:1 PPP: I pkt type 0xC021, datagramsize 14
00:24:50: BR0:1 LCP: I CONFREQ [REQsent] id 14 len 10
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