Cisco WAN :: 2801 High CPU - NAT Process Or CEF Switching?
May 17, 2011
I have in my router 2801, one link with 20 MB WAN Connection, and it is presenting high cpu utilization with 97% Interrupt Errors when start one download.
I exchanged it to another router the 2811 and it presented the same results. I read the cisco document about Router Performance.
And it speaks about the 2801 supports 46 Mbps using CEF/Fast Switching and 1.5Mbps using only Process Switching, and 2811 supports 61.44 CEF and 1.5Mbps Process Switching.
I need to know if the NAT Process is process switching or CEF Switching. Because if it was process switching the router is working in the max capacity and i will need to exchange the hardware to a better hardware.
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May 29, 2012
I have a process whick take all the CPU on two differents Stack of WS-C3750G in version 12.2.53(SE2):
XFRPALSN02R#sh proc cpu sorted CPU utilization for five seconds: 97%/3%; one minute: 95%; five minutes: 95% PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process 307 5450059 4167397 1307 86.74% 83.63% 83.35% 0 hulc nrgyz PD di XFRPALSN02R#sh proc cpu sorted CPU utilization for five seconds: 96%/3%; one minute: 96%; five minutes: 96% PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process 307 7779608 5947379 1308 86.26% 85.75% 85.30% 0 hulc nrgyz PD di
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Oct 9, 2011
i try newest ios 15.1(3)S0a and 12.2(33)SRE
in both case some times i obtain lowing traffic on interface and highest cpu - to 100%
after clear cef linicard i obtain growing traffic and cpu 0%
#sh proc cpu s
CPU utilization for five seconds: 87%/83%; one minute: 91%; five minutes: 96%
PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process
7 1711512 87883 19474 4.06% 0.84% 0.89% 0 Check heaps
[Code].....
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Jun 4, 2012
Our switch is very high cpu in process arp
Am debug ip arp track command the result as below
-- on this switch have interface vlan 201 ip subnet is 10.11.201.1/24
Jun 5 15:30:40.732 GMT+7: IP ARP: rcvd req src 10.11.201.217 0001.6c6b.8ab9, dst 172.27.116.73 Vlan201
Jun 5 15:30:42.150 GMT+7: IP ARP: rcvd rep src 10.11.201.217 0001.6c6b.8ab9, dst 172.27.116.4 Vlan201
Jun 5 15:30:42.150 GMT+7: IPARP_TRACK: ARP tableid(0) 10.11.201.217 Vlan201 mode(1) modified.
Jun 5 15:30:42.150 GMT+7: IP ARP: rcvd req src 10.11.201.217 0001.6c6b.8ab9, dst 172.27.116
and then am try to shutdown vlan database 201 after that the cpu process has to normal state.
How to check the root cacus?
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Nov 29, 2011
I have a router 3845 with c3845-advsecurityk9-mz.124-24.T6.bin software . Frequently we are facing problem in logging to the device .Inorder to resolve we need to reboot the router . Yesterday fortunately i have got the console access for some time so i came to know that TPLUS process is consuming 99.9% percentage cpu.
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Aug 30, 2010
I have a problem with cpu high.tell me if normal have this process?
CPU utilization for five seconds: 29%/0%; one minute: 29%; five minutes: 30%
PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process
29 198216576 402619350 492 15.83% 15.87% 15.68% 0 Cat4k Mgmt HiPri
30 175197296 96703435 1811 10.23% 10.10% 10.64% 0 Cat4k Mgmt LoPri
Cisco IOS Software, Catalyst 4000 L3 Switch Software (cat4000-I9S-M), Version 12.2(25)EWA14, RELEASE SOFTWARE (fc1)Technical Support: [URL] Copyright (c) 1986-2008 by Cisco Systems, Inc.Compiled Tue 20-May-08 18:49 by chendahImage text-base: 0x10000000, data-base: 0x114BE208
ROM: 12.2(31r)SG2Dagobah Revision 226, Swamp Revision 34
System returned to ROM by reloadSystem restarted at 00:36:52 UTC Sat Dec 10 2011System image file is "bootflash:cat4000-i9s-mz.122-25.EWA14.bin" cisco WS-C4506 (MPC8245) processor (revision 10) with 262144K bytes of memory.MPC8245 CPU at 266Mhz, Supervisor II+Last reset from Reload1 Virtual Ethernet interface144 FastEthernet interfaces2 Gigabit Ethernet interfaces511K bytes of non-volatile configuration memory.Configuration register is 0x2102
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Feb 6, 2012
We are experiencing with high CPU input due to ARP input between 20:30 and 22:30 every day At this time we have a lot of backup operations. When I look the netflow report, I can't see anything anormal.
We are changing our backup server's NIC card from 1gig to 10Gig. The backup operation's traffic is high (approx 2Gbps level) but 6509 has to be handle this size of traffic.
We are using two 6509E in VSS mode and our image version is s72033-adventerprisek9_wan-mz.122-33.SXJ.bin
20:00
show ip arp summary
--------------
2588 IP ARP entries, with 166 of them incomplete
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Nov 18, 2012
I'm facing high CPU utilization issue due to a ssh process on 3750 switch. What is the use of SSH proces in the switch? Can I disable it for troubleshooting?
will there be any impact if I disable it?
#sh processes cpu sorted 5min
CPU utilization for five seconds: 99%/0%; one minute: 66%; five minutes: 46%
PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process
159 1896078 589986 3213 3.96% 10.76% 14.00% 0 Hulc LED Process
165 32871 591 55619 77.42% 33.40% 8.85% 3 SSH Process
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Nov 13, 2011
which process is consuming high memory with my c6509 switch.
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Apr 18, 2012
we are using Cisco 6509-E VSS mode [12.2(33)SXI] ipbase image and facing high cpu utilization. In show process cpu output it is showing some "ios-base" process consuming cpu. I attached show cpu output
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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 3, 2012
We are running a stack of 2 WS-C3750X-24S-E's with IOS version 12.2(58)SE2 and we are seeing continuous high processor utilization involving the hl3mm process. The stack is configured for PIM Sparse mode, with 2 upstream Nexus 5596'es acting as both RP candidates and as BSRs. The hl3mm process generally runs at about 19% but can spike up into the 60% range.Symptoms on the 3750X are spiking latency and sluggish CLI perfformance. I thought at first that we might be running into SDM limits, but the "show platform tcam utilization" show that we are far under the limits of the default SDM template. Performing the "show ip pim (vrf name) bsr-router" command freezes the system and takes 20-30 seconds to return results. Similiarly configured WS-C3750G-12S running 12.2(55)SE3 does not exhibit these same issues.
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Oct 9, 2012
I have two core switches - 4506E, and i noticed there are frequent cpu spikes on both of the cores switches. As its spikes intermitendly i couldnt able to anlyze the issue. I need inputs on the following,
1) Is there any Free CPU process monitoring tools to identify which process is spiking ?
2) Troubleshooting techniques to identify the issue.
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Dec 27, 2010
We have a Cisco 886 configured with two WAN's (ATM0 connected to a DSL line and Fa3 connected to a CMTS modem).We're running DMVPN over the Cable network and GetVPN over the DSL line. When the DSL line is down we see a lot of CPU peaks up to 90%.The CPU peaks are caused by the process "DSL state machine". As soon as the DSL line has sync and the ATM0 interface goes UP the CPU peaks disappear. What we'd like to know is if this constant extra CPU load will have an impact on other resources like normal routing & switching or more specific IPSEC handling. Is it for example possible that establishing an IPSEC tunnel will fail because of the CPU peaks?
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May 29, 2012
We have one Router Cisco 2801 at the customer site and facing issue of having very High CPU coming to 99%.CPU utilization for five seconds: 99%/28%; one minute: 99%; five minutes: 98%
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Mar 22, 2011
I have an issue with 7600 router where CPU goes up to 60-70% and memory is also high. Both due to BGP Router process. URL We are seeing this issue since ISP has upgraded their router 20 days ago. Router also seen following error.I have not reset the BGP session with ISP yet. Is there any way I can supress BGP updates coming from ISP and see if CPU and memory USAGE reduces. IOS version 12.2(33)SRD and RSP720 with PFC 3cXL
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Sep 12, 2012
I have an issue with 7600 router where CPU goes up to 60-70% and memory is also high. Both due to BGP Router process. [URL] According to our baseline it should not be more than 40% at any given time. We see high CPU uptp 70% consistently.
CPU utilization for five seconds: 99%/0%; one minute: 57%; five minutes: 55%
PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process
442 66173704 90234125 733 96.86% 46.09% 46.30% 0 BGP Router
7 509291060 26330202 19342 1.17% 3.90% 2.99% 0 Check heaps
Router has 1 eBGP session with ISP from where it downloads whole IPv4 internet routing table and two IBGP session with other two rotuer. When I look at BGP summary table I see many updates received from ISP and sent out to IBGP neighbors. Also did debug BGP updates to confirm it.
We are seeing this issue since ISP has upgraded their router 20 days ago. Router also seen following error.
%BGP-6-BIGCHUNK: Big chunk pool request 628 for community. Replenishing with malloc
I have not reset the BGP session with ISP yet. Is there any way I can supress BGP updates coming from ISP and see if CPU and memory USAGE reduces. IOS version 12.2(33)SRD and RSP720 with PFC 3cXL
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Aug 26, 2012
Based on the stace trace, how do I determine what object is being polled??? (what is causing the high cpu for SNMP ENGINE)
From the “show stack 295” output (SNMP ENGINE)
router>show stack 295
Process 295: SNMP ENGINE
Stack segment 0x68226DC0 - 0x68229CA0
FP: 0x68229BD0, RA: 0x62A0D95C
FP: 0x68229BF8, RA: 0x628276A8
FP: 0x68229C68, RA: 0x629FBE08
FP: 0x68229C80, RA: 0x629FBDEC
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Feb 7, 2011
Each time I enter show run on my router 2821, it takes ages to display and I have a cpu peak from the ssh process ( I am connected through SSH)
RTR-2821-01#sh proc cpu sorted
CPU utilization for five seconds: 96%/21%; one minute: 34%; five minutes: 22%
PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process
55 26948 814 33105 74.96% 16.92% 5.87% 323 SSH Process
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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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Nov 14, 2011
We suddenly noticed high CPU utilization on one of our 7600 routers. I output of show process CPU showed high utlization for the FM core process. I looked it up but did not find information on what this process does. [code]
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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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Mar 28, 2012
I have a Catalyst Switch 6000. Inoticed that after the execution of the job inventory in LMS, and after the snmp queries reached the equipement, the cpu value reached 98-99 % due to the process : PDU DISPATCHER (what’s it ?)
I have also a script running in the switch to observe the differents logs. For exemple, when high cpu is obtained, the message bellow appear :
« %SNMP-3-INPUT_QFULL_ERR: Packet dropped due to input
« %SNMP-3-INPUT_QFULL_ERR: Packet dropped due to input
« %SNMP-3-INPUT_QFULL_ERR: Packet dropped due to input
....
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Jul 4, 2012
We are in the process of switching our infrastructure of our routing/firewalls/vpns over to cisco. We are switching our first location and one of the issues I'm struggling with is windows authentication pass-through for internally hosted web pages. Meaning, user inside our network has the 2921 as their default gateway, they try to access a web page that is hosted on the internal network but is secured with windows authentication. In the past, because they are logged into the domain internally, the website authenticates and loads. After switching to the Cisco, it asks for a password even though they are logged in.
Because its the web server that actually authenticates I'm not sure why the router isn't allowing that to happen, but I can't think of anything else that could be causing this behavior.
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Feb 24, 2009
We are following the ISSU process for upgading a VSS 1440, using the documentation here: URL
After copying image onto both supervisors, when the command:
issu loadversion sup-bootdisk:s72033-adventerprisek9_wan-mz.122-33.SXI.bin is run we get the following error:
% CV [ bootdisk:s72033-advipservicesk9_wan-mz.122-33.SXI.bin ] must be named first in BOOT [ bootdisk:s72033-adventerprisek9_wan-mz.122-33.SXI.bin ]
The advipservice image is the one running, and the adventerprise is the one we are trying to upgrade to.
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Feb 20, 2012
I am very new at this, but we have a 2801 router running 12.4, a 3560 that acts as the "Core" switch, and a bunch of remote 2960G's that connect via fiber to different buildings.
I am tasked to VLAN this network to reduce broadcast traffic. I started by setting up a VLAN 169 on the "3560" named the VTP domain, changed to version 2, and no password. THe Core switch and remote switch can share the VTP info, I HAD the Router seeing it too (able to ping 192.168.169.1) until I changed the "Domain" and "VTP Version"
The switches see each other fine, my problem is the Router sub interface 0/0.169 I cannot get to see the VTP domain. I imagine because I don't have a "Trunk port" set on the Router, but the option is not there. Meaning I cannot do a "switchport mode trunk" on it. The only thing I see is to make it:
TCRouter(config-subif)#encapsulation dot1Q 169 native
But, my "int fas 0/0" is used now as the main interface for our "only" network 192.168.0.0, do I need to turn this over to a subinterface and make it "Native" then the difference of the subinterfaces will advertise? Here is some of my conf:
Core SW:
TCCoreSW#sh vtp status
VTP Version : running VTP2
Configuration Revision: 8
Maximum VLANs supported locally : 1005
[Code]....
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Mar 19, 2013
document which explians normal booting sequence in a 6500 Switch running IOS. What I am looking for is in which order the image is loaded in SUP, RP, SP etc
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Jan 2, 2012
I've been reading the documentation for the new 3750v2 switch, and I'm wondering is the IPBase license supports FULL OSPF. The product sheet notes that it supports OSPF in the IPBase license, but then further down the page it notes that for advanced routing functions (EIGRP,OSPF) you need the IPServices license. Are there any limitations to the OSPF process on a 3750v2 with the IPBase license?
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Apr 15, 2013
We are looking to upgrade the version of IOS on the 6500s this evening and in preparation i've dowloaded the image to sup-bootdisk. However when trying to update the boot path as follows I see the following error: [code] Why are we seeing this message when the router is not doing anything with ISSU?
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Oct 24, 2012
The switch 6500-E is frequently crashing whenever the pm scp process reach 100% .I got it under the command "remote command switch show proce cpu".How to solve the problem. I opened the TAC and the engineer says to upgrade the image12.2(18) sxf.Is there any other work around that would avoid to reimage the switch and reloading.
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Sep 23, 2012
I have a hub and spoke WAN that conisits of one core location with with a 6500 and nine other buildings using 4006 Catalyst that conenct back to the core via dual gig fiber. We are using EIGRP at each location as well as the core. I was tesing something at one of our buildings decided to hang a 3750 off the 4006 and enable the same eigrp process on the 3750 that is enabled on the 4006 and 6500 (EIGRP 1).
1. All the routes that the 6500 knows about are advertised out to each of the nine locations.
2. The 4006's are all advertising thier directly conencted routes to the 6500.
Onto the location I was testing at:
The 4006 where I was testing at has four vlan interfaces enabled and they are in an UP/UP state. The ip routes from the 4006's directly conencted vlan interfaces propogate to the 6500 at our core location and the 6500 sucsefully propgates these learned routes to all the other 4006's.
This past Friday I configured a 3750x with two /22 vlan interfces and one physical gi port with an IP address and also configured on Ethernet port on the 4006 with an IP address in the same network block as the 3750x gi interface (a /30 netowrk block). I saw both interfaces come up and EIGRP sucesfully established a neighbor adjecency between the 3750x and the 4006.
I noticed that the 3750 advertised out all of it's directly conencted routes to the 4006 and the 4006 advertised it's directly conencted routes to the 3750. However, the 4006 did not advertise any of the routes it had learned from the 3750x to the 6500 and nor did the 4006 advertise any of the routes it had learned from the 6500 to the 4006. My suspicion is that the "eigrp stub connected summary" statement is enabled on both the 4006 and 3750 thus prevenintg them form advertising out any routes other than thier directly conencted routes. Can any of you verify that I'm either correct or inccorect about this?
here are the eigrp statemnets from the 6500 and 4006:
6500:
router eigrp 1
redistribute static
network 10.0.0.0
network 172.16.0.0
network 172.17.0.0(code)
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Mar 15, 2012
I have this 2801 in a critical environment. We had a brief power blip, and even though the router is on UPS, something happened. Anyway, after working with TAC, they determined the flash card had gone corrupt. Lucky for me I had a spare 2801 in my office, I grabbed that flash card and plugged it in and we're back up and going.
TAC sent me a new flash card. No matter what I do, I cannot get IOS to load on this thing! I am stuck in rommon. Here's what I've tried:
tftpdnld in rommon, times out. using another 2801 as a tftp-server. doesn't complete. using xmodem. ugh. never seems to get started. booting the router with a known good flash card, so I can get to ena, and "copy tftp flash".
have used tftpd32, Solar Winds TFTP server, What's Up Gold TFTP server, and open source tftp from sourceforge. With the tftp32, it always gets to exactly 73% download and then times out (it says, I have a feeling it's noty really a timeout). I have tried having the router and tftp server the only devices on a switch, i have tried the router plugged directly into the tftp server with a cross connect cable. No happiness. The open source tftp server reported (and I have to paraphrase, I am not near the router) "client does not support block number recount" or something like that. The client being the 2801.
The iOS file is about 45M. Someone asked me if the flash card was formatted...would that matter? would the tftp even start if it wasn't?
OK, I've gone on long enough. TAC is dispatching a new card AND 2801!
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Feb 11, 2013
Im using a 2801 router with a nat configuration.
The issue im having is the nat seems to be allowing only one machine at a time through the nat.
the range i am testing is 192.168.243.0
The firmware is c2801-spservicesk9-m
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
[Code].....
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