Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
Community Member

Input and CRC errors on uplinked switches

I currently have two adjoining switches that are having excessive input and CRC errors. One switch is a Cat 2970 and the other is a Cat 3548. I've included the config output and port stats for each switch interface. Does anyone know what could cause these conditions?

FastEthernet0/6 is up, line protocol is up

Hardware is Fast Ethernet, address is 0002.b963.9ac6 (bia 0002.b963.9ac6)

Description: Uplink to 10.50.1.4

MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,

reliability 255/255, txload 54/255, rxload 20/255

Encapsulation ARPA, loopback not set

Keepalive not set

Full-duplex, 100Mb/s, 100BaseTX/FX

ARP type: ARPA, ARP Timeout 04:00:00

Last input 00:00:00, output 00:00:54, output hang never

Last clearing of "show interface" counters never

Queueing strategy: fifo

Output queue 0/40, 0 drops; input queue 0/75, 0 drops

5 minute input rate 8224000 bits/sec, 2542 packets/sec

5 minute output rate 21354000 bits/sec, 3010 packets/sec

3547425034 packets input, 1949288603 bytes

Received 111173371 broadcasts, 0 runts, 0 giants, 0 throttles

46 input errors, 46 CRC, 0 frame, 638 overrun, 638 ignored

0 watchdog, 50626384 multicast

0 input packets with dribble condition detected

3186994272 packets output, 4199136339 bytes, 25174 underruns

0 output errors, 0 collisions, 3 interface resets

0 babbles, 0 late collision, 0 deferred

Current configuration:

!

interface FastEthernet0/6

description Uplink to 10.50.1.4

duplex full

speed 100

end

----------

GigabitEthernet0/1 is up, line protocol is up

Hardware is Gigabit Ethernet, address is 000d.28cd.7381 (bia 000d.28cd.7381)

Description: Uplink to 10.50.1.5

MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,

reliability 255/255, txload 43/255, rxload 23/255

Encapsulation ARPA, loopback not set

Keepalive set (10 sec)

Full-duplex, 100Mb/s

input flow-control is off, output flow-control is off

ARP type: ARPA, ARP Timeout 04:00:00

Last input 00:00:13, output 00:00:01, 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: fifo

Output queue :0/40 (size/max)

5 minute input rate 9237000 bits/sec, 1841 packets/sec

5 minute output rate 16910000 bits/sec, 2609 packets/sec

3184464966 packets input, 2088649959 bytes, 0 no buffer

Received 22332005 broadcasts, 0 runts, 0 giants, 0 throttles

24345 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

0 watchdog, 630182 multicast, 0 pause input

0 input packets with dribble condition detected

3545026242 packets output, 741171459 bytes, 0 underruns

0 output errors, 0 collisions, 1 interface resets

0 babbles, 0 late collision, 0 deferred

0 lost carrier, 0 no carrier, 0 PAUSE output

0 output buffer failures, 0 output buffers swapped out

Current configuration : 108 bytes

!

interface GigabitEthernet0/1

description Uplink to 10.50.1.5

no ip address

duplex full

speed 100

end

3 REPLIES
Blue

Re: Input and CRC errors on uplinked switches

these issues can be caused by faulty type patch/link cables or other physical layer issues.

the fact that you have GB >>> 100mb port makes me wonder if you get the same issues with 100mb >>> 100mb. if so, replace the patch cables or check the 'inside' wiring between the switches for faults or anomolies.

are you CAT5e on both sides, all the way through or do you have other CAT type cables in the mix? try a single specification end-to-end if you can.

Purple

Re: Input and CRC errors on uplinked switches

The first thing you need to do is clear the counters , according to your display they have never been cleared so you really don't know how long a period of time this is over , probably since the last time the switch was rebooted whenever that was , clear both sides then watch it . The errors could have been caused when you hooked the link if had a temporary speed/duplex mismatch or something . Clear counter s and watch for a week .

Community Member

Re: Input and CRC errors on uplinked switches

You may be running into this problem on the 3500 :

http://www.cisco.com/en/US/products/hw/switches/ps607/products_field_notice09186a00803278b7.shtml

It's worth checking the serial numbers just in case.

Dave

154
Views
0
Helpful
3
Replies
CreatePlease to create content