Input errors on Switch interface.

Shahab Khan · ‎03-25-2013

Hi All,

We are getting input error on switch interface connected to Cisco WLC 4404. Interface GigabitEthernet1/2/20 & 2/2/20 are connected to the WLC through a Port-channel 43.

GigabitEthernet1/2/20 is up, line protocol is up (connected)

Hardware is C6k 1000Mb 802.3, address is 001c.581b.96b3 (bia 001c.581b.96b3)

Description: ***connected to WLC gi 1****

MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,

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

Encapsulation ARPA, loopback not set

Keepalive set (10 sec)

Full-duplex, 1000Mb/s, media type is 10/100/1000BaseT

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

Clock mode is auto

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

Last input 00:00:40, output 00:00:00, output hang never

Last clearing of "show interface" counters 1d19h

Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: fifo

Output queue: 0/40 (size/max)

5 minute input rate 5311000 bits/sec, 1087 packets/sec

5 minute output rate 4502000 bits/sec, 934 packets/sec

31856658 packets input, 16697603991 bytes, 0 no buffer

Received 109772 broadcasts (98942 multicasts)

0 runts, 0 giants, 0 throttles

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

0 watchdog, 0 multicast, 0 pause input

0 input packets with dribble condition detected

61913072 packets output, 26409857527 bytes, 0 underruns

0 output errors, 0 collisions, 0 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

GigabitEthernet2/2/20 is up, line protocol is up (connected)

Hardware is C6k 1000Mb 802.3, address is 001c.58c5.6303 (bia 001c.58c5.6303)

Description: ***Connected to WLC ***

MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,

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

Encapsulation ARPA, loopback not set

Keepalive set (10 sec)

Full-duplex, 1000Mb/s, media type is 10/100/1000BaseT

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

Clock mode is auto

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

Last input 00:00:45, output 00:00:35, output hang never

Last clearing of "show interface" counters 1d19h

Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: fifo

Output queue: 0/40 (size/max)

5 minute input rate 1558000 bits/sec, 395 packets/sec

5 minute output rate 2880000 bits/sec, 1141 packets/sec

39786901 packets input, 25211217643 bytes, 0 no buffer

Received 190089 broadcasts (97226 multicasts)

0 runts, 0 giants, 0 throttles

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

0 watchdog, 0 multicast, 0 pause input

0 input packets with dribble condition detected

105318049 packets output, 25693590410 bytes, 0 underruns

0 output errors, 0 collisions, 0 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

Port-channel43 is up, line protocol is up (connected)

Hardware is EtherChannel, address is 001c.581b.96b3 (bia 001c.581b.96b3)

Description: ***Connected to WLC ***

MTU 1500 bytes, BW 2000000 Kbit, DLY 10 usec,

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

Encapsulation ARPA, loopback not set

Keepalive set (10 sec)

Full-duplex, 1000Mb/s, media type is unknown

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

Members in this channel: Gi1/2/20 Gi2/2/20

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

Last input never, output never, output hang never

Last clearing of "show interface" counters 1d19h

Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: fifo

Output queue: 0/40 (size/max)

5 minute input rate 6897000 bits/sec, 1473 packets/sec

5 minute output rate 7438000 bits/sec, 2078 packets/sec

70667118 packets input, 41341807742 bytes, 0 no buffer

Received 296223 broadcasts (193732 multicasts)

0 runts, 0 giants, 0 throttles

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

0 watchdog, 0 multicast, 0 pause input

0 input packets with dribble condition detected

164976595 packets output, 51389885464 bytes, 0 underruns

0 output errors, 0 collisions, 0 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

As part of troubleshooting, we replaced both the cables. We also tried changing the ports on switch & WLC both, but the issue still persists.

Regards,

Shahab

paul driver · ‎03-25-2013

Hello
can you post the config intetface config for switch and wlc

res
paul

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Paul

rodrigolangella · ‎09-23-2015

Sorry to revive this post but I'm trying to not flood the Forum.

I'm having the same problem with my WLC 2504. All 4 ports are in LAG and there is a high number of input packets with error. However, the wi-fi is still working but quite slow. This input errors could explain the slowness issue??

Here is my Port-Channel configuration:

interface Port-channel1
switchport access vlan 100
switchport trunk encapsulation dot1q
switchport mode trunk
end

Etherchannel Summary:

Number of channel-groups in use: 2
Number of aggregators: 2

Group Port-channel Protocol Ports
------+-------------+-----------+-----------------------------------------------
1 Po1(SU) - Gi2/0/17(P) Gi2/0/18(P) Gi2/0/19(P)
Gi2/0/20(P)

thanks for the help...

Carlos Rogério S. Santos · ‎06-24-2021

good evening dear

I have the same problem, has anyone seen this?

My switch interface is incrementing input errors, clean but reappear.
I've already changed the interface on the switch, I've changed the optical cord in the SPF, I just haven't changed the gibic yet, is it possible that the problem is in the gibic?

Are there any commands I can validate if this error increment is on the WLC side?

SW-CORE-LIN-01#show interfaces port-channel 28
Port-channel28 is up, line protocol is up (connected)
Hardware is EtherChannel, address is 2416.9d03.3c4c (bia 2416.9d03.3c4c)
Description: ***CONEXAO_WLC_LINHARES***
MTU 1500 bytes, BW 20000000 Kbit/sec, DLY 10 usec,
reliability 255/255, txload 5/255, rxload 5/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 10Gb/s, link type is auto, media type is N/A
input flow-control is on, output flow-control is unsupported
Members in this channel: Twe1/0/44 Twe2/0/44
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output 00:00:01, output hang never
Last clearing of "show interface" counters 1w5d
Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 2643909
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 457039000 bits/sec, 96296 packets/sec
5 minute output rate 446256000 bits/sec, 97326 packets/sec
27364704606 packets input, 19430010143532 bytes, 0 no buffer
Received 1799618 broadcasts (50960 multicasts)
0 runts, 0 giants, 0 throttles
32243 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 50960 multicast, 0 pause input
0 input packets with dribble condition detected
27913531075 packets output, 19123700090379 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 unknown protocol drops
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
SW-CORE-LIN-01#

Giuseppe Larosa · ‎06-25-2021

Hello @Carlos Rogério S. Santos ,

how have you configured the port-channel on the switch side ?

on the member links you have channe-group 28 mode on or channel-group 28 mode active ?

If I remember correctly the first option is the one to be used even if the WLC is declared to be able to support LACP.

the input errors are not classified in any category and are not so many in comparison to total packets received.

32243 input errors

27364704606 packets input

error ratio = 32243 / ( 27364704606 +32243 ) = 1,17 10^-6 just a little more then one packet evey million

this should not cause effects on user traffic.

The input errors might be LACP frames sent by the WLC ( if so they increase by 2 every 60 seconds)

16120 minutes

last clearing of counters 1w 5d ago --> 17280 minutes

Roughly a possible explanation is that those packets are LACP frames ignored and discarded by the switch if it is in mode on.

Hope to help

Giuseppe

Carlos Rogério S. Santos · ‎07-05-2021

Hello Giuseppe

Thank you very much for the clarification, I help a lot!

One last question, is it possible to force the interface speed on the WLC side to 1000 mbps and also force it to full duplex, instead of leaving automatic negotiation for the two options?

Giuseppe Larosa · ‎07-05-2021

Hello @Carlos Rogério S. Santos ,

I don't know but auto negotiation is the preferred mode for GE links

Hope to help

Giuseppe