Cisco WAN :: 2811 - High CPU Utilization While Heavy Traffic?
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.
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?
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.
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
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
I have a 7206VXR router doing policy routing with CEF enabled on all interfaces, no Cache Misses, Align Errors or failed buffers. CPU peaks up to 80% every two or three minutes. I suspect it is traffic related as I have a standby box and when it becomes the active on in the HSRP pair to high CPU load and LAN interface input errors follows it. see various show command output below. The router has a NPE-G1 and I'm using a gigabit port off of this on the LAn side and a E3 Frame Relay interface on the WAN side.
UK-DHC-Policy1#show buffersBuffer elements: 1118 in free list (1000 max allowed) 3539658545 hits, 0 misses, 1119 created Public buffer pools:Small buffers, 104 bytes (total 50, permanent 50, peak 229 @
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.
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
Our Router 7606 is in a problem with high CPU Utilization. We are using one EBGP and one IBGP session. We are also running OSPF with area 0 between two IBGP router to exchange few local networks. When bandwidth cross 100 MB than only CPU use become 100%. when bandwidth consumption is 80MB CPU use become 80% end so on.
Out put is when bandwidth consumption is 34MB
CPU utilization for five seconds: 44%/43%; one minute: 42%; five minutes: 30% PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process 78 44 9625 4 0.39% 0.03% 0.00% 2 Virtual Exec 13 40 375 106 0.07% 0.00% 0.00% 0 ARP Input 30 116 1098 105 0.07% 0.01% 0.00% 0 IPC Seat Manager
I have a hight CPU utilisation problem in my CISCO7609-S routers. the cpu utilisation can rise 99% et this is usually. In the moment of hight CPU the the process CPU give the following:
I am observing very high CPU utilization on my Cisco 7206VXR (NPE-G1) Router. We have done all the necessary troubleshooting but not able to identify root cause. [code]
I am running Cisco Prime 4.2(UNIX version) on a VM. CPU utilization will run between 90 and 100% constantly. Reloading the server will stabilize the CPU for a short period of time, however the CPU usage will always return to 90-100% utilization. Currently I have about 130 devices added to the system.
we have 2 Cisco C4507 Switches working As Core Layer, but the CPU Utilization is about 54% most of the time and sometimes it goes up to 70% or 80% also.
which services are causing this utilization. [code]
I am working as net admin which is i need to monitoring and manage my workplace network( education center )I got a few question about network traffic flow. Here is the issued.I got high bandwidth utilization so high after office hours which is only on night. as we know, after office hours there is no person at the office but the traffic flow on bandwidth utilization is high.what are the possibilities of this issued?
I have Cisco 7613 on my edge(MPLS Backbone). CPU utilization is shooting to 100% at frequent intervals. When I tell vendors managing device they tell that it is happening due to one of my server(connected on Fast ethernet port of 100Mbps) generating heavy traffic. My questions are:
1. Can a router of 720Gbps capability be choked due to traffic generated by 100Mbps link?
2. Interrupt CPU process utilization is well below 10% at the said time. BGP router process consumes most of the CPU. Does this means that server in question is generating too many routing updates?
3. Is there any way that I can limit routing updates on a particular link?
4. how to check which link is causing more CPU utilization.
My router is running with BGP (One eBGP and One IBGP session). I have filterdown the BGP roting table by using prefix-List and default route to upstream router.But still found the CPU process is high (80%/80% with 60MB traffic).
Sh Proc CPU ------------------- CPU utilization for five seconds: 88%/88%; one minute: 87%; five minutes: 87% PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process
I have Active Standby ASA5550 setup with VPN premium license. A few days back we had a requirement of SSL VPN connection for and we got a temporary from Cisco for same, this license expired and the ASA reverted to it's original license. 3 4 days after this we saw a sudden increase in CPU utilization (upto 90% + -5%) on the ASA during production hours but were not able to figure out the reason, in order to restore the services we failovered the firewall to secondary and everything worked fine. We were suspecting one of the following but there were no logs for any of this
1. The ASA hardware was haivng problem
2. Some client was doing a DoS attack to bring down the ASA (no logs for this as well).
We took a downtime to look further by failovering the ASA back to primary and it worked fine without any issues ruling out the 1st option. We also came across a licesing doc [URL]
Downgrading any license (for example, going from 10 contexts to 2 contexts).
# Note If a temporary license expires, and the permanent license is a downgrade, then you do not need to immediately reload the security appliance; the next time you reload, the permanent license is restored.
As per this doc, sooner or later a restart was required on the ASA. We restarted secondary ASA and everthing was fine but when we restarted the primary ASA by swtiching over to secondary some of the server (not all) in the DMZ stopped working (even ICMP unreachable) and only came back to normal when the primary ASA was restored and working fine (with failover).
The reboot was done by shuting down the physical link between the Core switch and ASA inside individually.
I am not sure what could be the issue that the servers in the DMZ wen unreachable.
We have a CISCO 7604 Router (GGSN) in our customer site. Since two weeks are observing high CPU utilization (even touching 100 percent). We performed a SNMP configuration on this routers 2 weeks back as well. But SNMP process is not consuming much CPU resources. The following is the output of the "show proc cpu" and "show proc cpu history.
------------------ show process cpu ------------------ CPU utilization for five seconds: 50%/15%; one minute: 49%; five minutes: 51% PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process
I have a remote site customer with a Cisco ASA 5540 running SSLVPN (Anyconnect)(8.03). It currently only serves about 450 SSLVPN clients. Since last friday, they've seen the CPU utilization go up to high 90% while only serving 400+ remote users. I saw some high cpu utilization bugs, but none looked to be relevant. How I can find the root cause of the CPU high utilization?
I am facing lots of issue with cisco 4507 switch recently.. Every alternate day, its CPU is getting utilized by 99% and network stopped working..finally it has to be restared.
Below is the CPU utilization of the process:-
------------------ show process cpu ------------------ CPU utilization for five seconds: 99%/0%; one minute: 99%; five minutes: 99% PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process
we have ASA 5520 with IOS 8.0 , when i am trying to add more static routes on the inside interface the CPU utilization is going up. one faced the same issue. I am configuring through the cisco ASDM 6.1(3)f.
I am facing high CPU util on my pix 515 E which is in failover mode.During peak hours the util is see rising to 60% where as in off peak hours it is normally12%.
During normal operation the average utilisation was observed to be 30% but suddenly from 2/3 days it is constantly 60% doule the value as earlier. Have gone through the logs and traffic but not able to tarce anything particular
below is the o/p of some command taken for analysis
IOS version 8.0(4) sh cpu usage CPU utilization for 5 seconds = 51%; 1 minute: 61%; 5 minutes: 58% sh cpu usage
I have a Router 2821 with c2800nm-advipservicesk9-mz.124-24.T1.bin and with a Cisco Integrated Service Engine(s) Cisco Unity Express 7.1.1 in slot 1 , this router shows a high cpu utilization.I think is a bug with the IOS , because there is no voicemail configured on the CUE, there is no traffic to the CUE , just traffic from:
- voice calls - ospf
The ospf is not the cause of the high cpu , because the high cpu utilization appears before I put the ospf proccess on the router.
Five Cisco 1142 integrated in WDS infrastructure: 4 - AP, 1 - WDS with AP... At once on all access points loading of the processor increased to 100 %. And "show proc cpu" - in total in norm, log on all cisco identical below:
Jun 25 16:11:58: %DOT11-6-ROAMED: Station f0cb.a123.d6f9 Roamed to 0c85.257f.05d0 Jun 25 16:11:58: %DOT11-6-DISASSOC: Interface Dot11Radio0, Deauthenticating Station f0cb.a123.d6f9 Reason: Sending station has left the BSS Jun 25 16:23:36: %LEAPCL-3-TIMEOUT: AP Timed out authenticating to the WDS Jun 25 16:23:42: %WLCCP_AP-6-INFRA: WLCCP Infrastructure Authenticated Jun 25 16:23:44: %DOT11-6-DISASSOC: Interface Dot11Radio1, Deauthenticating Station a088.b405.7320 Jun 25 16:23:44: %DOT11-6-DISASSOC: Interface Dot11Radio1, Deauthenticating Station 0021.5dbf.a3da
[code].....
The problem suddenly began, proceeded about an hour and also suddenly ended...
My client using 3845 as a core router . 200 number of branch are connected through 6 ISP.Some of days average process shows 90 % . Max time 50 %.In the morning when Branch location are off then time also high utilization.High utilization is not continue after intervals of time or periodic time its goes to high.
have any solution for that ?. before once 3845 is crash for that. another is ready for replacee.We test another device like core switches for observation CPU rate.
