Input error

Routing & Switching Switching
1

there or some input vlan error . could someone explain what could be impact
this is our WAN interface .

WNRT01#sh int Gi0/0/2.4000 controller | i error
     1983761 input vlan errors
WNRT01#sh int Gi0/0/2.4000 controller | i error
     1983777 input vlan errors
WNRT01#sh int Gi0/0/2.4000 controller | i error
     1983777 input vlan errors
WNRT01#sh int Gi0/0/2.4000 controller | i error
     1983777 input vlan errors
WNRT01#sh int Gi0/0/2.4000 controller | i error
     1983777 input vlan errors
WNRT01#sh int Gi0/0/2.4000 controller | i error
     1983777 input vlan errors
WNRT01#sh int Gi0/0/2.4000 controller | i error
     1983784 input vlan errors
WNRT01#sh int Gi0/0/2.4000 controller | i error
     1983784 input vlan errors
WNRT01#sh int Gi0/0/2.4000 controller | i error
     1983791 input vlan errors
WNRT01#sh int Gi0/0/2.4000 controller | i error
     1983791 input vlan errors
WNRT01#sh int Gi0/0/2.4000 controller | i error
     1983791 input vlan errors
WNRT01#sh int Gi0/0/2.4000 controller | i error
     1983808 input vlan errors
WNRT01#sh int Gi0/0/2.4000 controller | i error
     1983808 input vlan errors
WNRT01#
2

Hello Prashant

In order to determine if this is a problem or not we’ll need some more information. Can you tell us which platform you’re using? I have found that there is a bug on the ASR platform that describes your situation that you can read about here:

https://quickview.cloudapps.cisco.com/quickview/bug/CSCuz90934

Also, can you show us an example of your full output of the sh int Gi0/0/2.4000 controller command without the pipe? That would also be helpful.

Let us know this info and we’ll get back to you with more information.

I hope this has been helpful!

Laz

3

Model is cisco ASR1001 (1RU)

DCWNRT01#sh int Gi0/0/2.4000 controller
GigabitEthernet0/0/2.4000 is up, line protocol is up
  Hardware is ASR1001, address is d072.dca6.7382 (bia d072.dca6.7382)
  Description: Layer 3 to USSignal CO281292 AA7LJ
  Internet address is 10.71.64.33/30
  MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
     reliability 255/255, txload 31/255, rxload 49/255
  Encapsulation 802.1Q Virtual LAN, Vlan ID  4000.
  ARP type: ARPA, ARP Timeout 04:00:00
  Keepalive not supported
  Last clearing of "show interface" counters never
GigabitEthernet0/0/2
     487530 input vlan errors
     0 ingress over sub drops
     4 Number of sub-interface configured
DCWNRT01#sh int Gi0/0/2 controller
GigabitEthernet0/0/2 is up, line protocol is up
  Hardware is ASR1001, address is d072.dca6.7382 (bia d072.dca6.7382)
  Description: Link to USSignal VES CID A91M6
  MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
     reliability 255/255, txload 32/255, rxload 47/255
  Encapsulation 802.1Q Virtual LAN, Vlan ID  1., loopback not set
  Keepalive not supported
  Full Duplex, 1000Mbps, link type is auto, media type is SX
  output flow-control is off, input flow-control is off
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 01:01:54, output 00:08:27, output hang never
  Last clearing of "show interface" counters 3d21h
  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)
  30 second input rate 187162000 bits/sec, 34057 packets/sec
  30 second output rate 126935000 bits/sec, 29641 packets/sec
     6230519883 packets input, 4249571089414 bytes, 0 no buffer
     Received 13924 broadcasts (0 IP multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 449236 multicast, 0 pause input
     6429522307 packets output, 4996522906676 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
GigabitEthernet0/0/2
     487605 input vlan errors
     0 ingress over sub drops
     4 Number of sub-interface configured
DCWNRT01#
4

Hello Prashant

Ah, so it is an ASR 1001. So it could be that it is the bug that I shared with you that is causing the problem.

Now looking into this further, I have found the following bug report from Cisco:

CSCud92596
After show controller, could found “input vlan errors” counter increases without any packet drops. We also found when show interface, the value of “input errors” counter under related interface is 0.

As you can see, your case is exactly this. You have an increase in input vlan errors but you have zero input errors on the physical interface. According to the bug report, there is no workaround, and this is simply something you should not worry about.

I hope this has been helpful!

Laz