01-04-2009 08:58 PM - edited 03-04-2019 03:19 AM
My border router which is in the LAN, of late has started giving erratic ping(1000ms) and timeout yet it is just in the LAN after a reset it come to normal (ping response becomes an average 5ms)but when the traffic goes thro it ping response degrades.We use static ip routes, AL and NATing(sorry but am not allow to post the configs) any ideas why it is so. i have checked loop back configs but none. Any help will be appreciated
01-04-2009 09:44 PM
1. Check the interfaces along the path if there is accumulating packet drops (also check the settings). Chances are, it could be a duplex mismatch.
2. When the ping reach 1000ms, login to the router and check the cpu util. If its high, check which process is taking a lot of cpu time.
01-05-2009 10:11 AM
Thanks medan for the lead for sure when the ping become erratic the cpu utilization is around 98-100% which it has never attained before.The processes which takes most of the CPU time is IP Input, and TurboACL.
I have this article http://www.cisco.com/en/US/products/hw/routers/ps359/products_tech_note09186a00801c2af3.shtml.
But it has not helped. Any more advice
01-05-2009 10:15 AM
If this is happening consistently, I would configure netflow on the router to see if you can determine what traffic is going through the router. You can then block that traffic to see if it helps your throughput.
HTH,
John
01-05-2009 10:34 AM
Thanks John but i have all kinds of traffic( from clients) flowing thro the router i just need to pin which IP, AL, or config is causing the mess.From the records the issue happens like thrice in a day each time i do a reset things are normal.
01-05-2009 10:39 AM
Netflow would show you the IP, but if resetting the router fixes it, then personally I wouldn't suspect a host. Does it happen at the same time every day?
01-05-2009 10:47 AM
Thanks i will try netflow tho i have never configured it, give me time i try my hands on a demo router then on the BR because its critical each reset causes an uproar. The issue happens depending on traffic flow. The higher the traffic the faster it times out. Will get back to you once am done.
Thanks
01-05-2009 01:18 PM
Davis,
As others have indicated, NetFlow will help you identify what device(s) is/are causing the high bandwidth utilization which in turn is causing high CPU on the router.
Can you tell us what type of router and WAN speed this router have?
You may need to implement some kind of QoS to prevent this kind of behavior from occurring.
HTH,
__
Edison.
01-05-2009 08:54 PM
The router 7400ASR with 2 FastEthernet ports and 2 gig interfaces.thanks for overwhelming support
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide