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Chapter 8
Troubleshooting ISDN
Layer 1 U interface is ACTIVATED.
ISDN Line Information:
Current EOC commands:
RTN - Return to normal
Received overhead bits:
AIB=1, UOA=1, SCO=1, DEA=1, ACT=1, M50=1, M51=1,
M60=1, FEBE=1
Errors: [FEBE]=0, [NEBE]=0
Errors: [Superframe Sync Loss]=0, [IDL2 Data
Transparency Loss]=0
[M4 ACT 1 -> 0]=0
BRI U MLT Timers: [TPULSE]=0, [T75S]=0
. . . some output omitted . . .
0 missed datagrams, 0 overruns
0 bad datagram encapsulations, 0 memory errors
0 transmitter underruns
show isdn status
The show isdn status command is one of the more significant troubleshooting
commands because the output reports not only the status of the interface, but a
breakdown of each layer. As shown in the first screen, the router has established
a connection at Layer 1, but Layer 2 either remains in a negotiation mode or has
failed to negotiate due to an improperly set switch or router.
Top#show isdn status
Global ISDN Switchtype = basic-ni
ISDN BRI0 interface
dsl 0, interface ISDN Switchtype = basic-ni
Layer 1 Status:
ACTIVE
Layer 2 Status:
TEI = 79, Ces = 1, SAPI = 0, State = MULTIPLE_FRAME_
ESTABLISHED
Spid Status:
TEI 79, ces = 1, state = 8(established)
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