CRC ERRORS

[bruno.trombim]

Hi Guys,

i am needing some light to solve an issue that  came up this week, in attach has an image of my cisco  1841 Software (C1841-ADVSECURITYK9-M), Version 15.0(1), i am facing a CRC number raising so i am concerning about it, can you someone help me to start checking it.

ps. i already changed the cable and also change the port on the switch connected the router, and also was checked mismatched interface configuration, all seems good.

best regards,

[mattjones03]

Hi Bruno,

Are both interfaces auto/auto or are the speed and duplex defined on either end?

[bruno.trombim]

HI dear,

yes both sides are defined as auto/auto, please check the conf attached.

there is any analytics software or even any command that i could use to detect where tese crc comes from.

best regards,

[mattjones03]

Hi,

Generally, CRC errors are layer one issues (cabling/ports etc).

Can you provide a "show interface" output for the affected interface.

[mvsheik123]

Hi,

Try by hard coding speed & duplex on both sides.

Thx,

MS

[bruno.trombim]

Hi Dear,

could you please give some extra details how do i hard coding speed ? please check below some detais of my interface affected.

R18#show interfaces fastEthernet 0/1
FastEthernet0/1 is up, line protocol is up
Hardware is Gt96k FE, address is b4a4.e3f9.a9ab (bia b4a4.e3f9.a9ab)
Description: Redelocal
Internet address is 192.168.18.17/24
MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation 802.1Q Virtual LAN, Vlan ID 1., loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s, 100BaseTX/FX
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Input queue: 1/75/0/0 (size/max/drops/flushes); Total output drops: 80830
Queueing strategy: Class-based queueing
Output queue: 0/1000/0 (size/max total/drops)
5 minute input rate 78000 bits/sec, 78 packets/sec
5 minute output rate 76000 bits/sec, 73 packets/sec
2956165002 packets input, 255228213 bytes
Received 54159980 broadcasts, 90 runts, 0 giants, 3 throttles
64757 input errors, 3938 CRC, 0 frame, 0 overrun, 60819 ignored
0 watchdog
0 input packets with dribble condition detected
2892546413 packets output, 913929057 bytes, 0 underruns
0 output errors, 0 collisions, 10 interface resets
489831 unknown protocol drops
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out

best regards

[mattjones03]

Hi

In interface configuration mode, type the following commands;

!

speed 100

deplux full

!

This will be required on both interfaces.

[bruno.trombim]

Hi dear,

please check the interface status. 

R18#show interfaces fastEthernet 0/1
FastEthernet0/1 is up, line protocol is up
Hardware is Gt96k FE, address is b4a4.e3f9.a9ab (bia b4a4.e3f9.a9ab)
Description: Redelocal
Internet address is 192.168.18.17/24
MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation 802.1Q Virtual LAN, Vlan ID 1., loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s, 100BaseTX/FX
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Input queue: 1/75/0/0 (size/max/drops/flushes); Total output drops: 80830
Queueing strategy: Class-based queueing
Output queue: 0/1000/0 (size/max total/drops)
5 minute input rate 78000 bits/sec, 78 packets/sec
5 minute output rate 76000 bits/sec, 73 packets/sec
2956165002 packets input, 255228213 bytes
Received 54159980 broadcasts, 90 runts, 0 giants, 3 throttles
64757 input errors, 3938 CRC, 0 frame, 0 overrun, 60819 ignored
0 watchdog
0 input packets with dribble condition detected
2892546413 packets output, 913929057 bytes, 0 underruns
0 output errors, 0 collisions, 10 interface resets
489831 unknown protocol drops
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out

[paul driver]

Hello

Change the cabling and clear the counters then check again.
Clear counters fa0/1

res
Paul