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Cisco Router High Cpu Interrupts


Provide at least three examples of operations or packet types that are process switched. Thus, more recent values have more influence on the calculated average. Switches have specialized hardware that handle the switching task, so the main CPU should in general not be involved in this. The CPU is doing both of these functions simultaneously. weblink

If data is collected periodically, the output of show version shows if the problem has a periodic nature, for example, if it appears always at a certain time of day or Helpful Information CPU Receive Queues A packet sent to the CPU by switch hardware goes into one of 16 CPU queues, depending on the packet type. Enter the show sdm prefer privileged EXEC command to see the active SDM template on a switch: Switch# show sdm prefer The current template is "desktop default" template. This is a sample output for one interface: RouterA#show interfaces stat Ethernet0 Switching path Pkts In Chars In Pkts Out Chars Out Processor 52077 12245489 24646 3170041 Route cache 0 0

Cisco Router High Cpu Interrupts

Because the switch hardware sees the CPU receive-queue dropped packets as sent to the supervisor, the dropped packets are called Supervisor TxQueue Drop Statistics in the command output. An interrupt percentage over 10 percent should be investigated. The percentage of time at interrupt level is always less than or equal to the total CPU utilization. It has an extensive guide on what to do when encountering high CPU loads.

If data is collected periodically, the output of show version shows if the problem has a periodic nature, for example, if it appears always at a certain time of day or When High CPU Utilization Is a Problem These sections tell how to identify high CPU utilization and determine if it is a problem: Normal Conditions with High CPU Utilization Network Symptoms On Cisco 7500 routers, Versatile Interface Processors (VIPs) and Route/Switch Processors (RSPs) do not report linear CPU utilization. Ip Input High Cpu For instance the CPU is receiving lots of packets from the hardware because there's a broadcast storm on the network.

If they do not relinquish the CPU, as required by MIB instrumentation rules, there is a possibility of this error message. Show Memory Usage Cisco E-mail: Submit Your password has been sent to:[email protected] tech target logo About Us Contact Us FAQ Community Blog TechTarget Corporate Site Terms of Use DMCA Policy Privacy Policy Questions & Answers You will then need to do an initial analysis and diagnosis of the problem, before it is escalated to the vendor. http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750/software/troubleshooting/cpu_util.html Once you have completed the chapter, you should reevaluate yourself with the questions in the "Q&A" section at the end.

If particular processes consistently use large chunks of the available CPU time, however, this could be a clue that a problem exists associated with that particular process. Fed Process Cisco See Catalyst 3750 Series Switches High CPU Utilization Troubleshooting. As each tool/command is introduced, its usefulness is described and tips are given on how to use it effectively. When hardware problems are intermittent, they are harder to diagnose and isolate.

Show Memory Usage Cisco

It does not show the CPU time spent at interrupt. http://serverfault.com/questions/349925/why-is-my-router-cpu-at-40-when-no-processes-use-more-than-2 Debugging can also be of great help in troubleshooting high CPU utilization in processes. Cisco Router High Cpu Interrupts Enter the command multiple times to review active queue discards. How To Check Bandwidth Utilization On Cisco Router Even an 87-percent spike might be acceptable, depending on the cause.

more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed http://itivityglobal.com/high-cpu/dwm-exe-high-cpu-windows-10.html Switch# show processes cpu sorted 5sec CPU utilization for five seconds: 64%/19%; one minute: 65%; five minutes: 70% PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process 186 19472027 64796535 300 Available only on Cisco 7000 series routers with a Switch Processor or Silicon Switch Processor (for autonomous switching or silicon switching, respectively), or on Cisco 7500 series routers with a VIP For ease of use, save the script in a file such as /usr/bin/router-script. Hulc Led Process High Cpu

To use Cisco CLI Analyzer, you must be a registered customer, be logged in, and have JavaScript enabled. As the console is interrupt-driven, each character is an interrupt. L2 protocol—Used for protocol packets such as UDLD, and so on. http://itivityglobal.com/high-cpu/vlc-high-cpu-usage.html What are you doing to that traffic? –David Schwartz Jan 15 '12 at 4:18 | show 1 more comment 3 Answers 3 active oldest votes up vote 2 down vote accepted

Punted packets are handled at the interrupt level and can cause the CPU to become too busy. Troubleshoot High Cpu Usage Linux Identifying the Cause as System Process or Network Traffic To determine how busy the CPU is and which operating system processes are using the most CPU time, enter the show processes These are examples of operations that have the potential to cause high CPU utilization: Spanning Tree IP Routing Table Updates Cisco IOS Commands Other Events Causing High CPU Utilization Spanning Tree

Your processes are using 2%, the rest is being caused by the normal flow of traffic through the router.

Switch# show platform tcam utilization CAM Utilization for ASIC# 0 Max Used Masks/Values Masks/values Unicast mac addresses: 6364/6364 31/31 IPv4 IGMP groups + multicast routes: 1120/1120 1/1 IPv4 unicast directly-connected Date: Nov 16, 2001. The more instances and the more active interfaces, the greater the CPU utilization. Arp Input High Cpu This message is used to identify objects that use more CPU time than expected (but still not CPUHOG).

For the purposes mentioned by @TimPost. There are a number of reasons for this focus. In the previous example, the CPU utilization was between 40 and 56 percent for the past 37 hours. this content IP SLAs failures due to SLAs responses beyond the acceptable threshold.

This memory is used for internal communication between the system controller and other parts, so it appears to be high all the time. Run this script every five minutes if the high CPU utilization problem appears often and does not last long. The CPU time utilized by spanning tree varies depending upon the number of spanning-tree instances and the number of active interfaces. The core of the script is this line: (echo "show version") | telnet The command in parentheses is executed in sub-shell and the output is sent to a Telnet session.