03-26-2012 01:47 AM - edited 03-07-2019 05:46 AM
Hello everybody.
we're facing a weird issue lately with a Cisco 2821.
An interface stops responding after a few hours.
The only way to bring it 'up' again is:
Hardcode: duplex or speed
or
shutdown -> no shutdown
there are no errors in the "sho interface" and no errors or entries in the log.
FastEthernet0/0/0 is up, line protocol is up
Hardware is Fast Ethernet, -
Description: Infopoint
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
ARP type: ARPA, ARP Timeout 04:00:00
Last input 22:20:19, output never, output hang never
Last clearing of "show interface" counters 3d23h
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 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
158377 packets input, 13566230 bytes, 0 no buffer
Received 20036 broadcasts (3176 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
0 input packets with dribble condition detected
310913 packets output, 72379459 bytes, 0 underruns
0 output errors, 0 collisions, 1 interface resets
0 unknown protocol drops
0 babbles, 0 late collision, 0 deferred
2 lost carrier, 0 no carrier, 0 pause output
0 output buffer failures, 0 output buffers swapped out
Any idea why this is happening?
03-26-2012 02:27 AM
Hello,
Do you see packet count growing? I refer to these counts:
158377 packets input, 13566230 bytes, 0 no buffer
310913 packets output, 72379459 bytes, 0 underruns
Also see if this commands works for you:
show int fa0/0/0 count detail
Nik
03-26-2012 04:10 AM
Hi Nikolay,
yes its growing. Right now its stucks again, but the 2 counters still increase (eventho' its small).
show int fa0/0/0 count detail does not work. i only have:
sho int fa0/0/0 count ?
broadcast Show interface broadcast suppression discard counters
errors Show interface error counters
protocol interface protocol counters
trunk Show interface trunk counters
| Output modifiers
03-26-2012 05:49 AM
Hi,
We to faced the same issue before , after chaging the uplink from Fast Ethernet interface to Gigabit Interface the issue is not encountering again.Try this if you have Gigabit interface
03-26-2012 08:49 AM
If the packet counter growing slowly then it is expected to see rate as 0 as you have an average for 5 minutes there and average can be very close to 0 thus rounded up to it.
Do you see any problem due to this interface? Or you just worry of a counter - can you do any packet test (e.g. ping) which will flow through this interface? You can vary packet size and see if you get differencies with a rtae. Other thing is just reducing rate calculation time to 30 sec with "load-interval 30" in interface mode.
Hope this helps,
Nik
03-26-2012 11:41 PM
The problem is, that i can't ping the host on this interface anylonger.
what also resolves the problem is, when i unplug the ethernet cable and plug it back in.
i can ping it right away after this.
03-27-2012 12:00 AM
Hi
is the otherside of the cable managed?
What says the log ?
Cheers
Patrick
03-27-2012 12:09 AM
Hi Patrick,
no host side is not managed.
Unfortunately the log does not say anything about it.
03-27-2012 03:42 AM
Hi,
Do you have other interfaces , are you able to access other interface.
If you have spare interface please change the interface and observe
03-27-2012 03:17 AM
can you please monitor if the CPU and Memory too gets chocked during certain times..?
does this happen to all interfaces or just a single interface?
waiting for the revert !
Regards,
Parvesh
04-10-2012 01:16 AM
Hello everybody.
I changed the interface - it did not happend since.
Thanks everybody for the hints and tips.
04-30-2012 01:28 AM
Hi, Kakados2000 and everybody else, I'm a network adminstrator in my company, and I have been experiencing the same problem (gigabit Ethernet interface stucks after few hours), with the same cisco router (2821). I tried everything possible (except changing the built-in gigabit ethernet interfaces, of course) but the router keeps having the same problem after 3, or sometimes 5 or even 10 hours. And the only solution is to restart the router through the ON/OFF button or reload through a console session with the router (during that problem, connection through console is OK!) And you said that u solved the problem by changing the interface. You must therefore be my only way out of my router interface-related problem. I would like you to give me details about the pocedure u used to solve your problem. I'll be impatiently waiting for an answer. In the mean time, I'm stuck with restarting the router every 4, 5 or 8 hours, to restore the service.
Thanks
04-30-2012 03:37 PM
Think about upgrading the IOS. This looks like an IOS bug.
05-02-2012 01:29 AM
Hi, thanks for answering, I've been watching for some help coming up in this forum. Ok, I already did an upgrade of the IOS. Actually, it was a replacement of the existing IOS with a new one with the same version. What I did, was uploading a copy of the IOS from another faultless 2821 cisco router (which has been working for months now without being restarted), on a tftp server, then I downloaded the IOS onto the router flash. I deleted the old IOS and booted from the new IOS. I did this because we don't own a SERVICE CONTRACT from cisco, to download a recent IOS from their site.
The following is the output of the "sh vers" command.
ROUTER_TO_SITCOM#sh vers
Cisco IOS Software, 2800 Software (C2800NM-IPBASE-M), Version 12.4(3i), RELEASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2007 by Cisco Systems, Inc.
Compiled Wed 28-Nov-07 21:09 by stshen
ROM: System Bootstrap, Version 12.4(13r)T, RELEASE SOFTWARE (fc1)
ROUTER_TO_SITCOM uptime is 1 hour, 12 minutes
System returned to ROM by power-on
System image file is "flash:c2800nm-ipbase-mz.124-3i.bin"
Cisco 2821 (revision 53.50) with 251904K/10240K bytes of memory.
Processor board ID FCZ125171JK
2 Gigabit Ethernet interfaces
DRAM configuration is 64 bits wide with parity enabled.
239K bytes of non-volatile configuration memory.
62720K bytes of ATA CompactFlash (Read/Write)
Configuration register is 0x2102
Notice the "uptime is 1 hour, 12 minutes", this means that I had to restart the router just 1 hour and 12 minutes ago to restore the service. This IOS had caused no problem on the router I uploaded it from. So I doubt it's the IOS-related problem. Anyway I'm open to suggestions. I wish I could know how kakados2000 "changed the 2 built-in gigabit ethernet interfaces to solve his problem (The exact problem I've been seeking to solve for 1 month now.
PS: The suggestion of buying a new better cisco router to replace the misbhaving one has already been made by me to my Company, but they said I should find out a way to resolve the problem of the existing router. Otherwise, I'll have to keep restarting the router to restore the service until they buy a new router.
05-02-2012 02:59 AM
HI Allen,
Are you still getting the same issues?
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