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Community Member

Input errors ----- ignored on interface router

Hi all, I am having a issue about input errors (ignored):

- r1-lnshubcen-I#sh int fa0/0 | in CRC|carrier|counter

  Last clearing of "show interface" counters 20:54:56

     1118 input errors, 0 CRC, 0 frame, 0 overrun, 1118 ignored   <-------------

     0 lost carrier, 0 no carrier

Somebody knows why this kind of errros?

-Also I am seeing high cpu usaged:

r1-lnshubcen-I#sh processes cpu

CPU utilization for five seconds: 79%/48%; one minute: 62%; five minutes: 53%

r1-lnshubcen-I#sh proc cpu | in IP Input

123  3041824160   176252108        991 33.94% 28.01% 19.94%   0 IP Input   <----- this is the process with more proccess

-Show Interface Switching:

r1-lnshubcen-I#sh interfaces switching

FastEthernet0/0 To Office Ethernet

          Throttle count          0

                   Drops         RP          0         SP          0

             SPD Flushes       Fast          0        SSE          0

             SPD Aggress       Fast          0

            SPD Priority     Inputs     838680      Drops          0

    Protocol  IP

          Switching path    Pkts In   Chars In   Pkts Out  Chars Out

                 Process    2140892  343514039  413392516 3797912625

            Cache misses          0          -          -          -

                    Fast  330142896  864041550    4882833 2831039054

               Auton/SSE          0          0          0          0

    Protocol  DEC MOP

          Switching path    Pkts In   Chars In   Pkts Out  Chars Out

                 Process          0          0       2458     189266

            Cache misses          0          -          -          -

                    Fast          0          0          0          0

               Auton/SSE          0          0          0          0

    Protocol  ARP

          Switching path    Pkts In   Chars In   Pkts Out  Chars Out

                 Process     838679   50320740     130199    7811940

            Cache misses          0          -          -          -

                    Fast          0          0          0          0

               Auton/SSE          0          0          0          0

    Protocol  CDP

          Switching path    Pkts In   Chars In   Pkts Out  Chars Out

                 Process          0          0      24768    9213696

            Cache misses          0          -          -          -

                    Fast          0          0          0          0

               Auton/SSE          0          0          0          0

    Protocol  Other

          Switching path    Pkts In   Chars In   Pkts Out  Chars Out

                 Process          0          0     148584    8915040

            Cache misses          0          -          -          -

                    Fast          0          0          0          0

               Auton/SSE          0          0          0          0

    NOTE: all counts are cumulative and reset only after a reload.

If more information needed pls let me know.

Thanks

Everyone's tags (3)
9 REPLIES
Hall of Fame Super Gold

Input errors ----- ignored on interface router

The number is negligible over the total count, and can be ignored.

However, it may indicate a performance problem and the need to upgrade to a faster router.,

Input errors ----- ignored on interface router

Please post the output of

show proc cpu sorted | ex 0.00

show interfaces

show run

show version

See if you find any logs in show log that could help isolate the problem (Routing protocol neighbor flaps, etc)

It looks like a lot of traffic is being process switched. which is causing the CPU spike.

Hall of Fame Super Gold

Input errors ----- ignored on interface router

Omar,

Post the complete output to the command "sh interface Fast 0/0".

Community Member

Re: Input errors ----- ignored on interface router

Here you go:

---------------------------------------------------------------------------

r1#sh proc cpu | ex 0.00

CPU utilization for five seconds: 38%/35%; one minute: 35%; five minutes: 19%

PID Runtime(uS)     Invoked      uSecs   5Sec   1Min   5Min TTY Process

  45  2316368000     1605730       1442  0.23%  0.22%  0.23%   0 Per-Second Jobs

119   381524000    49678690          7  0.23%  0.21%  0.19%   0 IPAM Manager

123  2167971680   194868665       1002  33.75%  15.22%  23.78%   0 IP Input

154   145596000     8182104         17  0.07%  0.08%  0.07%   0 TCP Timer

---------------------------------------------------------------------------

---------------------------------------------------------------------------

interface FastEthernet0/0

description To Office Ethernet

ip address 63.111.142.97 255.255.255.240

ip flow ingress

ip flow egress

duplex full

speed 100

!

end

---------------------------------------------------------------------------

r1#sh ver

Cisco IOS Software, 2800 Software (C2800NM-ADVSECURITYK9-M), Version 15.0(1)M3, RELEASE SOFTWARE (fc2)

Technical Support: http://www.cisco.com/techsupport

Copyright (c) 1986-2010 by Cisco Systems, Inc.

Compiled Sun 18-Jul-10 02:23 by prod_rel_team

ROM: System Bootstrap, Version 12.4(1r) [hqluong 1r], RELEASE SOFTWARE (fc1)

r1 uptime is 2 weeks, 4 days, 12 hours, 37 minutes

System returned to ROM by power-on

System restarted at 06:59:22 CDT Sat Sep 14 2013

System image file is "flash:c2800nm-advsecurityk9-mz.150-1.M3.bin"

Last reload type: Normal Reload

This product contains cryptographic features and is subject to United

States and local country laws governing import, export, transfer and

use. Delivery of Cisco cryptographic products does not imply

third-party authority to import, export, distribute or use encryption.

Importers, exporters, distributors and users are responsible for

compliance with U.S. and local country laws. By using this product you

agree to comply with applicable laws and regulations. If you are unable

to comply with U.S. and local laws, return this product immediately.

A summary of U.S. laws governing Cisco cryptographic products may be found at:

http://www.cisco.com/wwl/export/crypto/tool/stqrg.html

If you require further assistance please contact us by sending email to

export@cisco.com.

Cisco 2811 (revision 53.51) with 249856K/12288K bytes of memory.

Processor board ID FTX0952C3YE

2 FastEthernet interfaces

6 Serial interfaces

6 Channelized T1/PRI ports

1 Virtual Private Network (VPN) Module

DRAM configuration is 64 bits wide with parity enabled.

239K bytes of non-volatile configuration memory.

125184K bytes of ATA CompactFlash (Read/Write)

License Info:

License UDI:

-------------------------------------------------

Device#   PID                   SN

-------------------------------------------------

*0        CISCO2811             FTX0952C3YE

Configuration register is 0x2102

---------------------------------------------------------------------------

r1-lnshubcen-I#sh int fa0/0

FastEthernet0/0 is up, line protocol is up

  Hardware is MV96340 Ethernet, address is 0016.4651.1c68 (bia 0016.4651.1c68)

  Description: To Office Ethernet

  Internet address is 63.111.142.97/28

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

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

  Encapsulation ARPA, 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 00:06:59

  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 146000 bits/sec, 75 packets/sec

  5 minute output rate 374000 bits/sec, 84 packets/sec

     37467 packets input, 7137354 bytes

     Received 198 broadcasts, 0 runts, 0 giants, 0 throttles

     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored        I just clear the counters again...

     0 watchdog

     0 input packets with dribble condition detected

     46754 packets output, 32511142 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 output buffer failures, 0 output buffers swapped out

-------------------------------------------------------------------------------------------------------------

show proc cpu history:

698989888997645566644566667978888987666366264666468888887888656366125421

    514533379360482255142369668489563644775734215282840011439223563764769333

100    *      *                      *

90  * * * ****                * *** *

80  **********               *********               **********

70 ************    **    *****************       *   ***********   *

60 *****#*#*****   ***   *****#**#***#**** ** * *** **######****** **  *

50 **#########********  *****#########**** ** *******#########**** **  *

40 **#########***************#########******* *******#########*******  **

30 *###########**************##########****** *******##########****** ***

20 *###########***********#**###########*************##########***********

10 ##################################################################*####*

   0....5....1....1....2....2....3....3....4....4....5....5....6....6....7..

             0    5    0    5    0    5    0    5    0    5    0    5    0

                   CPU% per hour (last 72 hours)

                  * = maximum CPU%   # = average CPU%

Thank you

Hall of Fame Super Gold

Input errors ----- ignored on interface router

Line errors, particularly CRC, can be caused by autonegotiation of speed and duplex being disabled.

The configuration of your interface is showing you hard coded the speed and duplex.  Take these two lines away and observe.

Community Member

Input errors ----- ignored on interface router

Hi Leo thanks, I tried that but no luck,  and just to clarify the errors are not CRC, they are "ignored errors"

Thank you

Super Bronze

Re: Input errors ----- ignored on interface router

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Posting

I believe ignored errors are when a packet is received, but the router doesn't have a buffer to save it in, so it "ignores" it.

This can be caused by the router being unable to keep up with the ingress rate (such as a burst).

As yours appears to be a 2811, a 2811 cannot really sustain wire-rate on its FE interfaces.

Additionally, on your 2811, its average CPU is somewhat busy and your stats show a large percentage of CPU  process switching.  This could be one of the contributors why the 2811 ignores some received packets.  It might be worthwhile to troubleshoot that.

However, as Paolo already noted, your ignored count is such a low percentage, its probably not worthwhile being concerned with.

Input errors ----- ignored on interface router

Please check the output of following -

show interface stats

show cef not-cef-switched

Community Member

Input errors ----- ignored on interface router

r1#sh interfaces Fa0/0 stats

FastEthernet0/0

          Switching path    Pkts In   Chars In   Pkts Out  Chars Out

               Processor     987269  126803071  114091142 4083257277

             Route cache   89712848 2569249918    1355427 1978110182

                   Total   90700117 2696052989  115446569 6061367459

r1#sh cef not-cef-switched

% Command accepted but obsolete, see 'show (ip|ipv6) cef switching statistics [feature]'

IPv4 CEF Packets passed on to next switching layer

Slot  No_adj No_encap Unsupp'ted Redirect  Receive  Options   Access     Frag

RP         0       0       16283        0   732103        0        0        0

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