Datasheet

Lab – Troubleshooting Basic PPP with Authentication

Received 0 broadcasts, 0 runts, 0 giants, 0 throttles

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

52 packets output, 2772 bytes, 0 underruns

0 output errors, 0 collisions, 34 interface resets

0 unknown protocol drops

0 output buffer failures, 0 output buffers swapped out

1 carrier transitions

DCD=up DSR=up DTR=up RTS=up CTS=up

R2# show interfaces s0/0/1

Serial0/0/1 is up, line protocol is down

Hardware is GT96K Serial

Internet address is 192.168.23.1/30

MTU 1500 bytes, BW 1544 Kbit/sec, DLY 20000 usec,

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

Encapsulation HDLC, loopback not set

Keepalive set (10 sec)

CRC checking enabled

Last input 00:00:11, output 00:00:00, output hang never

Last clearing of "show interface" counters never

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: weighted fair

Output queue: 0/1000/64/0 (size/max total/threshold/drops)

Conversations 0/1/256 (active/max active/max total)

Reserved Conversations 0/0 (allocated/max allocated)

Available Bandwidth 1158 kilobits/sec

5 minute input rate 0 bits/sec, 0 packets/sec

5 minute output rate 0 bits/sec, 0 packets/sec

230 packets input, 4370 bytes, 0 no buffer

Received 230 broadcasts, 0 runts, 0 giants, 0 throttles

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

119 packets output, 3014 bytes, 0 underruns

0 output errors, 0 collisions, 42 interface resets

230 unknown protocol drops

0 output buffer failures, 0 output buffers swapped out

121 carrier transitions

DCD=up DSR=up DTR=up RTS=up CTS=up

Have all links been established? _________ No

If the answer is no, which links need to be examined? What are the possible issues?

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The link between R2 and R3 has not been established because S0/0/1 interface is configured with HDLC

encapsulation. Beside the encapsulation issue, authentication mismatch can also prevent link

establishment.

b. Use the show run interface command to examine links that have not been established.

R2# show run interface s0/0/1

Building configuration...