Cisco WAN :: 2811 Router With High CPU (processes Are Fine)
Sep 24, 2012
I have a 2811 Router that is experiencing high CPU utilization. I have already issued the "show cpu proc" command, and everything seems to be fine (it's not a process issue) . According to our traffic graphs, we've seen that CPU is related to high link utilization, since we have 2 Fast Ethernet interfaces (Internet 4 MB and MPLS 6 MB), and when those interfaces have to deal with a lot of traffic at some hours, the CPU Load increases in the Router.
I found an article where they say that 2811 ISR Routers can deal with up to 61,44 Mbps (120.000 pps), but our router is far away from reaching that limit.It usually manages up to 16 MBPS. This router manages some services such as NAT traslation, ACLs, voice traslation profiles, policy routing (QoS), firewall and DHCP.
What can be happening to the router?.. Is it normal that when it has to process a lot of traffic, its cpu must increase up to 95%, even if it is handling just 16 MB compared to the theorical 61 MB? Is there any command or tool that I could use to troubleshoot this issue? Is there any limit in terms of WAN traffic that it could handle? How much influence do those services have over CPU Utilization?
Given these incidents, which router series could suit better in my network to avoid high CPU issues?
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Apr 23, 2013
Is there a way to allocate CPU or memory resources to specific processes - similar to a QoS-style configuration where you can prioritize the processes being handled by the CPU? We have a 2811 router whose CPU periodically spikes to 100% utilization. At these times, all of our EIGRP neighbor adjacencies bounce - either a peer goodbye is received or the hold time expires.
Our thinking is that we could possibly tell the router to prioritize the EIGRP process with the CPU so that routing is maintained, even though we realize other processes (like qos or ISAKMP for our tunnels) may suffer.
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May 9, 2011
there is no logging in the access-list (there is only one inbound access list).Using QoS or not, doesn't seem to make a differenceAll route-caching features are ON. (CEF, Flow, Policy, Fast)Yet the minimum CPU utilisation I have seen is 25%/25%... On average it's 40% during the day, but once traffic picks up to around 6000 packets per second, the router is gone...I have a 50/50 Mbps connection, but I can use only 6 for VoIP ?
Show interfaces:
GigabitEthernet0/0 is up, line protocol is up
Hardware is MV96340 Ethernet, address is 0014.1c26.7c30 (bia 0014.1c26.7c30)
Description: $ETH-LAN$$FW_INSIDE$
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 6/255, rxload 7/255
[code]...
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Apr 29, 2013
I have a 2811 that is really hitting the CPU hard. Nothing shows on CPU processes. It has an IPsec VPN tunnel back to HQ which also has a 2811 that terminates the VPN. The HQ has 2-3 IPsec tunnels to other remote sites. The CPU at the HQ avg 50% utilization during business hrs, peaks at about 80%. The remote one is very high 95% peaks, avg 80%-95% during business hours with bandwidth utilization of only 10-20Mbps. I read somewhere that its possible that fragmentation could be causing this. My question is, if I set the MTU to 1450 on the remote, I am guessing I will need to do all the other routers as well, the HQ and other remote sites? Siince they use the same outside interface to my HQ, is that correct?
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Jun 23, 2011
We have Cisco 2811 router and facing high CPU utilisation as 70%/67%;,IOS Runing :c2800nm-advsecurityk9-mz.124-3f.bin.
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Dec 8, 2011
Our 2811 Edge router is having extremely high CPU problems. IP Input is consuming 70% of the process during business hours. Cisco express forwarding is enabled. It only shows 50% but its currently before business hours. Id say even 50% is still high.
CPU utilization for five seconds: 55%/16%; one minute: 70%; five minutes: 76%
PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process
104 5310320 2813117 1887 36.92% 46.73% 51.43% 0 IP Input
The below interface is our public interface and is constantly over utilized with 100% Is there any configurations that can be done to correct this? Is there any more information that is needed?
IOS: (C2800NM-ADVSECURITYK9-M), Version 12.4(24)T4
Show IP Interface
FastEthernet0/0 is up, line protocol is up
Internet address is x.x.x.x
Broadcast address is x.x.x.x
Address determined by non-volatile memory
[code]....
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Sep 24, 2012
I have a router 2811 and shows high CPU utilization 90%, it is observed that this happens when the traffic increases, the router also has firewall enabled services, QoS, DHCP, ACLs, NAT. As my router could not determine what is appropriate for my use, and how it could choose a router that meets my needs.
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Oct 24, 2012
We are having issues with our Cisco 2811 when there a lot of traffic on the device. Usually the router is down around 5%-10%. Total traffic might be around 2.0 MB. This is a router we are using at a remote campus. We do HD video conferencing every friday. We have a 10 MB internet connection that has our VPN connection to the main campus on it. While doing these VTC, the totall traffic is about 6 MB. The CPU Utilization then rises to approx 75% cause call issues and loss of sound. With another test with no one using the connection for anything else the utilization went up to 35%. The router has 128 MB Ram in it. Does the router need more RAM or do we need a larger internet pipe.
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Aug 10, 2011
I am facing a problem on a 2811 router. The CPU is remaining around 60% and the router throughput is reaching at most 18 MB while according to the data sheet the 2811 maximum throughput is 61MB. I have checked the output interpreter in order to try and figure out the cause of the high CPU and to determine if it is affecting throughput but there are not processes consuming more than 10%. I have attached the show tech-support and the show process cpu history outputs.
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Apr 24, 2011
2811 router
Cisco IOS Software, 2800 Software (C2800NM-ADVENTERPRISEK9_IVS_LI-M), Version 12.4(24)T4, RELEASE SOFTWARE (fc2)
CPU utilization for five seconds: 82%/73%; one minute: 74%; five minutes: 77% PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process 116 222084 57773 3844 1.83% 1.69% 1.66% 0 IP Input 183 85148 309479 275 1.03%
[Code].....
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Apr 4, 2012
I have cisco 2811 at branch and 3845 at Head office. Two link with 256 kbps bandwidthe each. I did as follows: [code]
When link 1 down, traffic change to Tunnel 2. its OK.I want when link1 flaxuate or latency high (more than 60 ms) traffice change to tunnel 2. If link 2 goes high latency automatically change to tunnel 1.
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Feb 23, 2013
we have 2811 router with multiple servers connected to it's lan from which there are monitoring servers in between , the router suffers always from high cpu utilization
configuration has alot of ACLs & NAT & IPSEC Tunnel with wan bandwidth 20 M? Is there any method to reduce the high CPU utilization shown below !!
CPU utilization for five seconds: 90%/80%; one minute: 93%; five minutes: 90%
PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process
104 737029848 427864243 1722 5.45% 5.65% 5.65% 0 IP Input
253 63392216 11081854 5720 1.04% 1.15% 1.12% 0 IP NAT Ager
260 82602372 137425723 601 0.64% 0.64% 0.66% 0 PDU DISPATCHER
[code]....
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Aug 7, 2011
i'd like to monitor the OSPF process of my MPLS routers by SNMP. I created templates for
ospfIfEvents
ospfNbrEvents
ospfSpfRuns
ospfNbrState
ospfAreaLsaCount
but when i configure the poller i believe the data i mixed up somehow. I for example i don't get all neighbor in the ospfNbrState. i tried with snmp context configuration but i am not sure if this right what i did.
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Aug 27, 2012
I am seeing an increasing number of processes on our Solaris based Ciscoworks server. The parent and the zombie processes are the following:
root@cw:/usr/ucb# ./ps -alxwww | grep 26915
0 101 14737 26915 0 0 0 0 Z 0:00 <defunct>
0 101 15986 26915 0 0 0 0 Z 0:00 <defunct>
0 101 16052 26915 0 0 0 0 Z 0:00 <defunct>
0 101 16065 26915 0 0 0 0 Z 0:00 <defunct>
0 101 16161 26915 0 0 0 0 Z 0:00 <defunct>
[code]....
This isn't the first time this happens, the last time I restarted the server and the problem disappeared for a while.
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May 16, 2012
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Jul 12, 2012
There are some unknonw issues with ciscoworks LMS 3.2 on a solaris server. Many important processes like [code] and many others (around 40 processes were in shutdown state).When I try to start the processes from the Console window by "Managing processes" option, they still remain down with the same status.I tried to stop and then start the daemon manager, with the below commands: [code] After this, when I run command to check processes status (attached for your reference), I can still see those processes down.
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Dec 10, 2012
Yesterday I had a installation of LMS4.2.2 who was working fine. I followed the procedure to install VMware Tools on the virtual appliance on this thread url...
Now I have a problem with the processes of LMS, but maybe it is not linked. I forget to do a snapshot before installing VMware Tools so I need to find a solution. A whole bunch of services do not start know. I tried to uninstall the VMware tools, to regenerate SSL certificate, I rebooted the server several times. It is running under VMware 5.1. [code]
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May 30, 2012
I have a problem with ME-3600x running two ospf processes. Proc1 is WAN and PRoc2 is LAN. I am redistributing routes into both directions. After a WAN outage , certain wan routes did not get redistributed into the LAN process. I had to do a clear ip route to fix the problem. Has anynoe seen such a scenario with ME-3600x or any other switch/router
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Jan 7, 2013
I am having a bit of trouble with my internet. Whenever I start up a video game like ArmA, CoD, BF3, GMod, ect. My internet crashes. I also ran game booster and it crashed my internet. [code]
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Jul 7, 2012
I can't connect via wifi to my router, but can connect to the internet with an ethernet cable. However, my other computer connects via wifi without problems. I've gone through my troubleshooting and the wifi light is on, so that's not the issue. I also updated my driver (says it's working fine) and even tried to uninstall and reinstall it. I am not sure what else to do. If I try to connect via wifi though, the computer recognizes all the available networks, including my own, but just won't connect. It says a cable is unplugged (which at that time it is, because it's supposed to connect wirelessly).I have a HP Pavilion dv6-3147sb Entertainment notebook, and it uses Windows 7.
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Apr 20, 2013
I just bought a brand new computer and I plug everything in, including the ethernet cable used on my previous computer. This cable is plugged into a wireless router, which in turn is plugged into a modem giving it Internet. So yes I understand this part. But on my new computer it says "Not connected, and no connections available." I then plug the computer directly into the modem, I in turn receive Internet beautifully and quite quickly. But I cannot keep it like this because I need the wireless router for other devices. So I set everything up back the way it was and my other devices work! Even other plugged in one's that aren't wireless, but still not this new computer.. What do I do
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Oct 13, 2011
Today I've received reports of slow internet access/activity and have noticed myself that it seems a bit slow today. On the dashboard of our asa 5510 the "outside interface" traffic usage is running constantly high. It's at the top of the graph. How can I tell what is causing the spike in utilization. It usually runs at about 1500-2000 Kbps, and now it's up over 10,000.
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Nov 26, 2012
We installed a solution with 2 Cisco 2801, BGP multihomed failover.
1) The router which is currently getting all the traffic gets to 55% to 60% of CPU usage when handling 40 SIP/RTP streams . This equals 10Mbit up/10Mbit down and it showed around 5800 packets TX and around 5800 packets RX, with a majority of them CEF switched. As those figures are way less than the performance figures published by Cisco, we wonder if we made any mistake in setting up our router, or if we can do something to improve the router setup.
2) Does it have an impact on router performance if we increase/decrease RTP packet size, thus increasing or decreasing the pps relative to the consumed bandwidth?
3) If it is not possible to improve router configuration, we also wonder about possible replacement units for those routers. Would a 2901 do a good job? By how much would it rise the capacity? What other models would you recommend if we plan to rise the number of concurrent calls by a factor of 4 or even 8 times of what we have now (so up to 48000 pps and 80Mbit).
Here is what we tried:
- ip route-cache same-interface does not seem to improve anything
- ip flow ingress on or off makes no difference
- disabling the inbound ACL on fa0/0 seems to reduce load by 10%, although I don't understand why - a very high percentage is CPU interrupts, and ACLs are process switched, or not?
- we tried following the Cisco guide for high CPU due to high interrupts, with no success
Here are some usage statistics:
The graphs that we plot via SNMP show a propotional growth/increase of CPU and bandwidth (and thus pps) At the highest loads, we had a bit more than 55% CPU utilization with more than 50% interrupt CPU.
CPU utilization for five seconds: 36%/30%; one minute: 30%; five minutes: 30%
PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process
127 13140 954 13773 2.00% 0.29% 0.07% 194 SSH Process
[Code].....
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Apr 9, 2012
All the light indicator of the router are working as they should,however there will be no internet connection.This happens about once a day(rest of the day the internet works fine),I then have to switch off the router,wait for a good amount of time and then switch it back on and then internet will work fine.I use the router for many devices like my windows 7 laptop,an ipad,iphones.
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Jan 21, 2013
I can follow directions and am fairly tech-savvy, just don't have the time to troubleshoot this stuff and run my business. Here's the rundown:Router:Cisco Linksys E1000 V2
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-verified with tech support the problem is not physical
-right now, am hardwired to the router, which is hardwired to the cable modem, and connectivity is fine through hardwiring
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This webpage is not available:The server at www.google.com can't be found, because the DNS lookup failed. DNS is the network service that translates a website's name to its Internet address. This error is most often caused by having no connection to the Internet or a misconfigured network. It can also be caused by an unresponsive DNS server or a firewall preventing Google Chrome from accessing the network.
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Nov 2, 2012
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Jun 7, 2012
I have a Netgear WPN824 v2 wireless router. The router login page has become horribly slow recently but the rest of the network seems unaffected. Some times the page doesn't even load all the way or properly, such as with a standard font and options missing.
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Apr 11, 2011
I have recently purchased a new laptop (less than a week ago) and since purchase I have had the same recurring problem. Coincidentally, my wireless router is brand new also, and so it makes the situation even more difficult to eradicate. My laptop connects to the router wirelessly without a hitch, however, every five minutes or so, a small yellow exclaimation mark appears alongside the 'connection symbol' and it says there is either 'No Internet Access', or 'No Network Access', despite the fact it is connected to the wireless and has a full strength connection. However, my brother's laptop connects and surfs the web seamlessly, as well as the family desktop PC and various mobile devices. I am reluctant to return the laptop back to the store?
Tech Support Guy System Info Utility version 1.0.0.1
OS Version: Microsoft Windows 7 Home Premium , 64 bit
Processor: AMD Athlon(tm) II P360 Dual-Core Processor, AMD64 Family 16 Model 6 Stepping 3
Processor Count: 2
RAM: 2811 Mb
Graphics Card: ATI Mobility Radeon HD 4200 Series , 256 Mb
Hard Drives: C: Total - 152621 MB, Free - 118639 MB; D: Total - 152221 MB, Free - 144186 MB;
Motherboard: TOSHIBA, PWWAE, 1.00, 0123456789AB
Antivirus: Norton 360, Updated and Enabled
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May 3, 2013
I bought a Kindle whitepaper that uses Wi Fi. Other than going to a free wi fi location to download Amazon books, I decided to buy a router. Everything seems to be ok at the router end I believe. But when I use the wireless feature on Kindle, type in the password I assigned to the router, it always, I mean always, no matter how many times I set up, reinstall the router, and try to log into Kindle storefront using my kindle, Kindle always returns the message "Incorrect Password". Now I don't have a problem with the router. I'll keep it for future wi fi usage. I have done an installation with no password and can then go to Kindle storefront on the Kindle but that is rather insane to not have a password while I am reading books on Kindle. Why the password I assign to the router isn't working with Kindle after I reset the router (using a paper clip method) and reconfiguring with the new username and password like 5 times already? The username appears ok on the Kindle wireless, just the password doesn't work. I'd like the issue resolved before I buy more wireless products. Great router.
Product: DIR-615
Hardware version: H/W Ver.: I1
Firmware version: F/W Ver.: 9.02NA.
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Nov 12, 2011
what's the difference between High-power and High-gain wireless USB adapters.
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Apr 12, 2012
We have FIOS at our home. All the wall connections for ethernet are wired to the control panel in our house which are then connected to a wired router. We have another wireless router in the upstairs which gets internet through the wall port and it works fine.We had another downstairs wireless router in the living room that was working fine as well, but I reset it for certain reasons and it no longer works properly. All the proper lights light up: internet, port, power but the computer can only connect to the network and not the internet for some reason.
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Sep 11, 2012
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Jul 29, 2011
As of two days ago my DIR-655 seems to have stopped loading webpages every 10-30minutes for periods of up to 5-15 minutes, as in they the reloading icon will constantly be circling and the webpage remains blank, no error or anything until it says failed to load on my web browser (tried multiple browsers such as Safari, Chrome, IE and Firefox). This problem occurs on every computer on my network, laptops (both Mac and PC) and desktops. When this problem occurs all lights on modem and router seem to be normal no signs of anything going down but I originally thought that this affected wired and wireless but I seem to have narrowed it to culprit being the wireless. When connected to the PC I can browse for an indefinite amount of time without the webpages failing to respond, however when I connected to WiFi through Airport on a Macbook Air my webpages start to begin failing to load around 5-10 minutes of browsing which affects all computers connected to the network (essentially all computers failing to respond to the internet during this outage).
Interestingly when this problem occurs, if I am connected to Skype or Aim it will stay connected and I can still chat with people but I will not be able to sign onto AIM if the problem occurs before I sign on and I try to sign on during the outage. If I am streaming a video from justin.tv or ustream it still continues to stream during this "outage".I have the revB of the DIR-655 and have tried resetting the modem, turning off the firewall, upgrading firmware to 2.03NA from 2.01NA and setting the MTU to 1400 (default 1500) with nothing working. I am using Time Warner Wideband ISP and have connected the modem directly to my PC and for the 30minutes or so that I tested the web browsing it seemed fine and did not have any errors.
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