10-01-2013 09:50 AM - edited 03-04-2019 09:11 PM
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
10-01-2013 11:31 AM
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.,
10-01-2013 02:11 PM
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.
10-01-2013 02:21 PM
Omar,
Post the complete output to the command "sh interface Fast 0/0".
10-02-2013 05:39 PM
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:
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If you require further assistance please contact us by sending email to
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
10-02-2013 06:46 PM
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.
10-03-2013 07:54 AM
Hi Leo thanks, I tried that but no luck, and just to clarify the errors are not CRC, they are "ignored errors"
Thank you
10-03-2013 11:25 AM
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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.
10-03-2013 03:13 PM
Please check the output of following -
show interface stats
show cef not-cef-switched
10-07-2013 04:02 PM
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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