Cisco WAN :: High CPU Utilization On 2811 Router
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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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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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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Jan 19, 2010
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.
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Jan 20, 2011
Have high cpu utilization on Cisco 7609 router. when i check output "Sh proc cpu sort".
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Apr 12, 2011
I have problems with the Router 2801.When i give the command show processes cpu, the command show me that the router is working in 98%.
I have vlans like voice vlan and others, I have one 20 Mb Wan Link and I redirect all traffic from my lan to this link and when i browse in internet or i do downloads the router goes to 98%, when i don't make it the router processes goes down.
I thought be problem with hardware, but i exchange to another router and the same problem happened.Before this situation, I had one link with 12 Mb and nothing happened, when i exchange this to the 20 mb link the problems starting.
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Dec 6, 2012
I have on 7200 series router with NPE-G1 module which is facing high CPU utilization. I have not found any particular process causing this high CPU utilization as it is caused due to interrupts. I have already enabled fast switching by "ip cef" command. Please suggest how to normalize the utilization as it is impacting the network and causing slowness. Please find below the output of show process cpu and also find attached the show tech of the device. Also let me know if any other output is required.
[CODE]...
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Jul 29, 2012
We have a 7206 router which acts as a MPLS Hub router for around 100+ remote locations. Bandwidh at mpls hub(terminated on this router) is 50 Mbps.
We have noticed that Memory utilization in this router gradually increases and when it reaches 100% this router hangs. It happence in frequesncy of 10 days and we have to restart the router when memory is 100%.
CPU utilization is normal i.e below 20%, WAN bandwidth will never cross 30mbps.
We are running OSPF on this router
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May 3, 2011
I have problems with router 2801, the version is
Cisco IOS Software, 2801 Software (C2801-ADVENTERPRISEK9-M), Version 12.4(24)T4, RELEASE SOFTWARE (fc2)
When i start a download the processes of the router cpu stay in 99%/97%. When i'm not doing a download the processes stay in 3%/0%. I have one 20 mb link to Wan.
I did the troubleshooting seeing the this document :
[URL]
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Sep 25, 2012
We've got Cisco 2821 for our 90mb/s Internet Access. Its CPU usage is around 80%. Show process cpu does not show any cpu proccess with high utilization. But we have got plenty of policing configured for our clients using policy maps. Can this policing affect cpu usage?
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Dec 31, 2012
I've came across a very odd topology to deal with where everything is connected to everything, without proper utilization of VLANs.
- I've an L3 SW and a 3745 RTR at core
- Both are carrying same subnet to an L2 distribution switch that connects server farm within the same subnet (i.e. 1.1.3.x subnet)
- The L2 switch works as a passive switch, hence another network say, 1.1.2.x has been plugged into it as well.
- This L2 switch extends to other switches without configuration of any VLANs or STP and distributes 1.1.3.x network.
Periodically and unexpectedly, the router starts hanging and utilization goes beyond 80%, and there's nothing at all that is observed in "sh proc cpu" to be eating router resources. Its quite difficult to observe the pattern, as its random.
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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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Oct 12, 2011
What causes LMS 4.1 to have high memory utilization?
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Sep 28, 2012
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
[code]....
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Aug 10, 2011
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:
the show processe cpu history give: show version
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Jan 7, 2013
High cpu utilization on cisco 7206 vxr router.[code]
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Jun 20, 2012
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]
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Dec 4, 2012
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.
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Jun 12, 2013
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]
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Dec 12, 2011
we have cisco 4510+R switch with Cisco IOS-XE software & we are facing high cpu utilization on core 1 (95%) & on core 0 (15%) since last 2 hours.
I have taken logg file but did not understand how to analyzed it & where is problem. log file is attached.
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Sep 18, 2011
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?
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Apr 25, 2012
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.
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Nov 30, 2012
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
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CPU utilization for five seconds: 88%/88%; one minute: 87%; five minutes: 87%
PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process
[Code].....
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Mar 10, 2013
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.
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Dec 20, 2010
Since a couple of months, I have some CPU problem.
There is no high process :
l#sh processes cpu | exclude 0.00CPU utilization for five seconds: 39%/30%; one minute: 32%; five minutes: 32% PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process 130 52713208 240359987 219 0.95% 0.91% 1.00% 0 IP Input 202 1811824 1218190 1487 0.07% 0.06% 0.05% 0 HIDDEN VLAN Proc 338 20873364 219225 95214 7.11% 0.94% 0.71% 0 BGP Scanner
total amount of traffic on the router around 700Mb-1Gb out / 300Mb In
cisco CISCO7603 (R7000) processor (revision 1.1) with 458752K/65536K bytes of memory.Processor board ID FOX090308DTR7000 CPU at 300Mhz, Implementation 0x27, Rev 3.3, 256KB L2, 1024KB L3 CacheLast reset from power-on5 Virtual Ethernet interfaces9 Gigabit Ethernet interfaces1915K bytes of non-volatile configuration memory.
65536K bytes of Flash internal SIMM (Sector size 512K)
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Jul 26, 2011
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
[Code]......
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Apr 19, 2011
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 @
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May 11, 2008
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?
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Dec 21, 2011
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
[Code].....
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Dec 22, 2012
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.
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