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New Member

Acceptable level of CRC errors on frame relay WAN links?

I've noticed quite a disparity from one WAN router to another on our network as it relates to CRC errors. However, I have no frame of reference as to what is acceptable. My gut instinct tells me that "786965" is not a good thing (see log information below for details). Any insights on this matter in terms of assessing CRCs would be greatly appreciated. Thanks!

3542 CRC

786965 CRC

1064 CRC

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EXAMPLE 1

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Serial0/0 is up, line protocol is up

Hardware is PQUICC with Fractional T1 CSU/DSU

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

reliability 255/255, txload 1/255, rxload 13/255

Encapsulation FRAME-RELAY IETF, loopback not set

Keepalive set (10 sec)

LMI enq sent 845576, LMI stat recvd 845566, LMI upd recvd 0, DTE LMI up

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

LMI DLCI 1023 LMI type is CISCO frame relay DTE

Broadcast queue 0/64, broadcasts sent/dropped 1968353/0, interface broadcasts 1827420

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

Last clearing of "show interface" counters 13w6d

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 24

Queueing strategy: weighted fair

Output queue: 0/1000/64/24 (size/max total/threshold/drops)

Conversations 0/26/256 (active/max active/max total)

Reserved Conversations 0/0 (allocated/max allocated)

Available Bandwidth 1152 kilobits/sec

5 minute input rate 84000 bits/sec, 10 packets/sec

5 minute output rate 12000 bits/sec, 9 packets/sec

75253767 packets input, 2961814545 bytes, 0 no buffer

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

10748 input errors, 3542 CRC, 6015 frame, 0 overrun, 0 ignored, 1191 abort

66597348 packets output, 722048064 bytes, 0 underruns

0 output errors, 0 collisions, 2 interface resets

0 output buffer failures, 0 output buffers swapped out

1 carrier transitions

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

--------------------------------------------------------

EXAMPLE 2

--------------------------------------------------------

Serial0/0 is up, line protocol is up

Hardware is PQUICC with Fractional T1 CSU/DSU

MTU 1500 bytes, BW 512 Kbit, DLY 20000 usec,

reliability 255/255, txload 1/255, rxload 13/255

Encapsulation FRAME-RELAY IETF, loopback not set

Keepalive set (10 sec)

LMI enq sent 53000, LMI stat recvd 52931, LMI upd recvd 0, DTE LMI up

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

LMI DLCI 1023 LMI type is CISCO frame relay DTE

Broadcast queue 0/64, broadcasts sent/dropped 123253/0, interface broadcasts 114321

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

Last clearing of "show interface" counters 6d04h

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 40

Queueing strategy: weighted fair

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

Conversations 0/22/128 (active/max active/max total)

Reserved Conversations 0/0 (allocated/max allocated)

Available Bandwidth 384 kilobits/sec

5 minute input rate 28000 bits/sec, 7 packets/sec

5 minute output rate 3000 bits/sec, 7 packets/sec

1871783 packets input, 1078252500 bytes, 0 no buffer

Received 0 broadcasts, 0 runts, 50 giants, 0 throttles

1332972 input errors, 786965 CRC, 540869 frame, 0 overrun, 0 ignored, 5137 abort

1775834 packets output, 302835862 bytes, 0 underruns

0 output errors, 0 collisions, 132 interface resets

0 output buffer failures, 0 output buffers swapped out

62 carrier transitions

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

--------------------------------------------------------

EXAMPLE 3

--------------------------------------------------------

Serial0/0 is up, line protocol is up

Hardware is PQUICC with Fractional T1 CSU/DSU

MTU 1500 bytes, BW 512 Kbit, DLY 20000 usec,

reliability 255/255, txload 3/255, rxload 71/255

Encapsulation FRAME-RELAY IETF, loopback not set

Keepalive set (10 sec)

LMI enq sent 88215, LMI stat recvd 88215, LMI upd recvd 0, DTE LMI up

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

LMI DLCI 1023 LMI type is CISCO frame relay DTE

Broadcast queue 0/64, broadcasts sent/dropped 205316/0, interface broadcasts 190613

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

Last clearing of "show interface" counters 1w3d

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 0/10/256 (active/max active/max total)

Reserved Conversations 0/0 (allocated/max allocated)

Available Bandwidth 384 kilobits/sec

5 minute input rate 143000 bits/sec, 17 packets/sec

5 minute output rate 8000 bits/sec, 15 packets/sec

2185316 packets input, 1454400807 bytes, 0 no buffer

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

3039 input errors, 1064 CRC, 1354 frame, 0 overrun, 0 ignored, 621 abort

2022635 packets output, 362917779 bytes, 0 underruns

0 output errors, 0 collisions, 1 interface resets

0 output buffer failures, 0 output buffers swapped out

1 carrier transitions

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

  • Other Network Infrastructure Subjects
1 REPLY
New Member

Re: Acceptable level of CRC errors on frame relay WAN links?

A recommendation:

Any input error value for cyclic redundancy check (CRC) errors, framing errors, or aborts above one percent of the total interface traffic suggests some kind of link problem that should be isolated and repaired.

Tips:

http://www.cisco.com/univercd/cc/td/doc/cisintwk/itg_v1/tr1915.htm

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