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Webcast-Catalyst9k
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input, crc errors and carrier transitions

I breifly lost connection on one of my routers which connects 2 sites via a leased line. I checked the logs, and it was not power cycled, but looking at the serial interfaces which connect to the leased line I noticed input, crc erros and carrier transitions. Below is the output from a sh int from each router. I'm trying to determine the clock rate on both, but am a little confused. They each have a built-in CSU/DSU, so I'm not sure how clocking works in that case. I can't seem to find a command that tells me what the clock rate is. I almost tried just setting an identical clock rate at each end, but think it will be intrusive and knock out our connection temporarily. Based on the output below, am I on the right trail?

Thank you,

Bill

Harrisburg-1720#sh int ser 0

Serial0 is up, line protocol is up

Hardware is PQUICC with Fractional T1 CSU/DSU

Internet address is 10.0.4.2/30

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

reliability 255/255, txload 210/255, rxload 72/255

Encapsulation HDLC, loopback not set

Keepalive set (10 sec)

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

Last clearing of "show interface" counters 3w6d

Input queue: 0/75/0 (size/max/drops); Total output drops: 6

Queueing strategy: weighted fair

Output queue: 11/1000/64/6 (size/max total/threshold/drops)

Conversations 2/40/256 (active/max active/max total)

Reserved Conversations 0/0 (allocated/max allocated)

5 minute input rate 440000 bits/sec, 135 packets/sec

5 minute output rate 1273000 bits/sec, 171 packets/sec

39524992 packets input, 616171347 bytes, 0 no buffer

Received 280944 broadcasts, 0 runts, 5 giants, 0 throttles

6 input errors, 0 CRC, 1 frame, 0 overrun, 0 ignored, 0 abort

40158932 packets output, 2326620656 bytes, 0 underruns

0 output errors, 0 collisions, 0 interface resets

0 output buffer failures, 0 output buffers swapped out

10 carrier transitions

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

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

Hardware is GT96K with integrated T1 CSU/DSU

MTU 1500 bytes, BW 1536 Kbit, DLY 20000 usec,

reliability 255/255, txload 67/255, rxload 60/255

Encapsulation FRAME-RELAY, loopback not set

Keepalive set (10 sec)

LMI enq sent 240597, LMI stat recvd 240597, LMI upd recvd 0, DTE LMI up

LMI enq recvd 0, LMI stat sent 0, LMI upd sent 0

LMI DLCI 0 LMI type is ANSI Annex D frame relay DTE

FR SVC disabled, LAPF state down

Broadcast queue 0/64, broadcasts sent/dropped 126802/0, interface broadcasts 86696

Last input 00:00:04, output 00:00:04, output hang never

Last clearing of "show interface" counters 3w6d

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 11930

Queueing strategy: weighted fair

Output queue: 0/1000/64/11876 (size/max total/threshold/drops)

Conversations 0/60/256 (active/max active/max total)

Reserved Conversations 0/0 (allocated/max allocated)

Available Bandwidth 1152 kilobits/sec

5 minute input rate 363000 bits/sec, 103 packets/sec

5 minute output rate 408000 bits/sec, 108 packets/sec

125355003 packets input, 3780863130 bytes, 0 no buffer

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

4 input errors, 4 CRC, 1 frame, 1 overrun, 0 ignored, 1 abort

118815665 packets output, 202934665 bytes, 0 underruns

0 output errors, 0 collisions, 0 interface resets

0 output buffer failures, 0 output buffers swapped out

4 carrier transitions

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

Hummelstown2811#

3 REPLIES
VIP Purple

Re: input, crc errors and carrier transitions

Hello Bill,

is this supposed to be the output from BOTH sides, that is, are the serial interfaces from which you have shown the output supposed to be connected to each other ? I am just asking because one uses HDLC, and the other Frame Relay encapsulation...

Regards,

GP

New Member

Re: input, crc errors and carrier transitions

sorry, the serial 0/0/0 is the interface that attaches to the frame relay network. Below is the correct serial interface output

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

Hardware is GT96K with integrated T1 CSU/DSU

Description: Pt-to-Pt Connection to Derry st in Harrisburg Circuit ID:13HCGS507006

Internet address is 10.0.4.1/30

MTU 1500 bytes, BW 1536 Kbit, DLY 20000 usec,

reliability 255/255, txload 104/255, rxload 23/255

Encapsulation HDLC, loopback not set

Keepalive set (10 sec)

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

Last clearing of "show interface" counters 3w6d

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 409

Queueing strategy: weighted fair

Output queue: 0/1000/64/403 (size/max total/threshold/drops)

Conversations 0/24/256 (active/max active/max total)

Reserved Conversations 0/0 (allocated/max allocated)

Available Bandwidth 1152 kilobits/sec

5 minute input rate 139000 bits/sec, 80 packets/sec

5 minute output rate 627000 bits/sec, 102 packets/sec

40594053 packets input, 2651807718 bytes, 0 no buffer

Received 281426 broadcasts, 0 runts, 0 giants, 0 throttles

140 input errors, 140 CRC, 32 frame, 0 overrun, 0 ignored, 37 abort

39884468 packets output, 796221553 bytes, 0 underruns

0 output errors, 0 collisions, 0 interface resets

0 output buffer failures, 0 output buffers swapped out

10 carrier transitions

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

New Member

Re: input, crc errors and carrier transitions

I think I may have got this, start at layer 1...I swapped out the RJ45 cable that uplinks the router serial interface to the telco. I'm monitoring now, but in over an hour no errors at all.

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