topic Re: WLC Connected interface am getting input error in Wireless

WLC Connected interface am getting input error

VinothkumarRajendran29612 — Mon, 05 Jul 2021 20:19:09 GMT

Brand new Wireless controller 9800-L its connected with C9500-48Y4C on port TwentyFiveGigE.

Core switch :

C9500-48Y4C on port TwentyFiveGig -> WLC TwoGigabitEthernet0/0/0

On the wireless controller interface am getting input errors...

Hostname #show int TwoGigabitEthernet0/0/0
TwoGigabitEthernet0/0/0 is up, line protocol is up
Hardware is BUILT-IN-4x2_5GE, address is 687d.b4fc.8c2c (bia 687d.b4fc.8c2c)
MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive not supported
Full Duplex, 1000Mbps, link type is auto, media type is RJ45
output flow-control is off, input flow-control is off
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:09, output 00:00:22, output hang never
Last clearing of "show interface" counters 00:00:13
Input queue: 0/375/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: Class-based queueing
Output queue: 0/40 (size/max)
5 minute input rate 50000 bits/sec, 66 packets/sec
5 minute output rate 4000 bits/sec, 3 packets/sec
705 packets input, 65491 bytes, 0 no buffer
Received 0 broadcasts (0 multicasts)
0 runts, 0 giants, 0 throttles
3613 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 0 multicast, 0 pause input
46 packets output, 8064 bytes, 0 underruns
Output 0 broadcasts (0 multicasts)
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
0 carrier transitions

I have cleared the counter and no luck on it...

Kindly help us to fix the issue as soon as possible.

Re: WLC Connected interface am getting input error

Leo Laohoo — Wed, 03 Mar 2021 04:54:11 GMT

NOTE: I am not sure if this option is supported on the 9800.

What is the complete output to the following command:

sh interface TwoGigabitEthernet0/0/0 controll

What firmware is the WLC running on?

Wait ... 9500 is an all-fibre switch. The WLC is connected on an RJ45.
Are you using a GLC-T?

Re: WLC Connected interface am getting input error

VinothkumarRajendran29612 — Wed, 03 Mar 2021 05:00:59 GMT

Hostname#sh interface TwoGigabitEthernet0/0/0 controll
TwoGigabitEthernet0/0/0 is up, line protocol is up
Hardware is BUILT-IN-4x2_5GE, address is 687d.b4fc.8c2c (bia 687d.b4fc.8c2c)
MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive not supported
Full Duplex, 1000Mbps, link type is auto, media type is RJ45
output flow-control is off, input flow-control is off
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:01, output 00:00:09, output hang never
Last clearing of "show interface" counters 00:34:00
Input queue: 0/375/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: Class-based queueing
Output queue: 0/40 (size/max)
5 minute input rate 81000 bits/sec, 71 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
138623 packets input, 16972077 bytes, 0 no buffer
Received 0 broadcasts (0 multicasts)
0 runts, 0 giants, 0 throttles
84 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 0 multicast, 0 pause input
3655 packets output, 856120 bytes, 0 underruns
Output 0 broadcasts (0 multicasts)
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
0 carrier transitions
TwoGigabitEthernet0/0/0
0 input vlan errors
0 Number of sub-interface configured

IOS version : 16.12.4a in the wireless controller.
Yes 9500 switch copper SFP its connected...

Re: WLC Connected interface am getting input error

Leo Laohoo — Wed, 03 Mar 2021 05:18:33 GMT

I have seen several GLC-T/GLC-TE bugs on Catalyst 9k.
I think this is one of them.

I think one of the "workarounds" is to disable auto-negotiation.
Use optical SFP.

Re: WLC Connected interface am getting input error

VinothkumarRajendran29612 — Wed, 03 Mar 2021 05:43:37 GMT

optical SFP used only of fiber connection am right...

Re: WLC Connected interface am getting input error

Leo Laohoo — Wed, 03 Mar 2021 05:58:59 GMT

Yes. Try using fibre optics.

Re: WLC Connected interface am getting input error

VinothkumarRajendran29612 — Wed, 03 Mar 2021 07:53:50 GMT

controller optic cable won't support it, its a copper port.
devices are sits in very nearby in the rack

Re: WLC Connected interface am getting input error

balaji.bandi — Wed, 03 Mar 2021 08:02:32 GMT

if the copper, change with a new patch lead and reset the counters and observe. (make sure you use right Cat cable to support speeds)

Cat 9500 side Copper GLC-T 1GB ( i have seen in the past as @Leo Laohoo mentioned some issue with GLC-T - when i was testing)

can you post some information on the switch side to look

show interface tw x/x trans

show interface tw x/x

try

no negotiation auto

Re: WLC Connected interface am getting input error

Leo Laohoo — Wed, 03 Mar 2021 09:08:02 GMT

How about just test the theory?

Try using fibre optic and see if the line errors go away?

Re: WLC Connected interface am getting input error

syedhaq007 — Wed, 27 Oct 2021 04:24:21 GMT

Hi ,

We have same issue, we are using WLC 9800 with cisco 3850 and we CRC and Input error on the swicth. so we change the port from 3850 to 2960 but still same as recommended from cisco. every week the reachability of APs get disconnected and all users affected, need expert advice to resolve this. Cisco TAC could not find and fix. WLC side we dont see errors. they connected via UTP cat 6

GigabitEthernet1/0/26 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is 4ca6.4dea.c39a (bia 4ca6.4dea.c39a)
Description: ***Connected-to-WLC2***
MTU 1500 bytes, BW 1000000 Kbit/sec, 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 10/100/1000BaseTX
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:18, output 00:00:00, 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 3469000 bits/sec, 499 packets/sec
5 minute output rate 3521000 bits/sec, 541 packets/sec
1517725493 packets input, 1004199540210 bytes, 0 no buffer
Received 4876156 broadcasts (2960758 multicasts)
0 runts, 0 giants, 0 throttles
436 input errors, 436 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 2960758 multicast, 0 pause input
0 input packets with dribble condition detected
1571834437 packets output, 1009173785592 bytes, 0 underruns
0 output errors, 0 collisions, 4 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

interface GigabitEthernet1/0/26
description ***Connected-to-WLC2***
switchport mode trunk
end

WLC interface config

WLCGeidea-Pri#sh int te0/1/1
TenGigabitEthernet0/1/1 is up, line protocol is up
Hardware is BUILT-IN-2x10GE-C, address is f4bd.9e57.f0d1 (bia f4bd.9e57.f0d1)
MTU 1500 bytes, BW 10000000 Kbit/sec, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive not supported
Full Duplex, 10000Mbps, link type is auto, media type is RJ45
output flow-control is on, input flow-control is on
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:05, output 00:00:17, output hang never
Last clearing of "show interface" counters never
Input queue: 0/375/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 3463000 bits/sec, 566 packets/sec
5 minute output rate 3602000 bits/sec, 528 packets/sec
1571254892 packets input, 1002814844799 bytes, 0 no buffer
Received 0 broadcasts (0 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 0 multicast, 0 pause input
1517720986 packets output, 997894447610 bytes, 0 underruns
Output 0 broadcasts (0 multicasts)
0 output errors, 0 collisions, 1 interface resets
65285 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
1 carrier transitions

----

Current configuration : 108 bytes
!
interface TenGigabitEthernet0/1/1
switchport mode trunk
negotiation auto
no snmp trap link-status
end