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Troubleshoot High Cpu Usage Cisco Router


The punted IP packets are counted as CPUAdj, shown in bold in this example. Open a Support Case (Requires a Cisco Service Contract.) Related Cisco Support Community Discussions The Cisco Support Community is a forum for you to ask and answer questions, share suggestions, and Contributed by Cisco Engineers Was this Document Helpful? Example 4-11 shows sample output from the show memory command. http://blackplanetsupport.com/high-cpu/show-cpu-usage-on-cisco-router.html

In versions prior to 12.4(13) on the 2600, the processes ran for longer times but did not generate messages because the IOS versions did not have this enhancement. The statistics do not reset. Under normal operating conditions, on a non-stackable switch at a minimum, the CPU will have a certain baseline utilization. Repeatedly going over long access lists is very CPU-intensive.

Cisco Router High Cpu Interrupts

If your network is live, make sure that you understand the potential impact of any command. Compiling multiple LaTeX files How should I respond to absurd observations from customers during software product demos? Terminal length is set to something short (15 in this case), and the "q" character is sent only by prompt.

For example, an acceptable spike could be caused by the network administrator entering a write memory privileged EXEC command on the CLI. If yes, periodically collect the output of the show processes cpu command, which shows if the high CPU utilization is caused by interrupts or by a certain process. In those cases, most of the CPU cycles will be consumed in interrupt mode. Hulc Led Process The first is the username, then the password, and so on.

Also, whenever you decide to upgrade Cisco IOS Software on your router, you should verify the recommended amount of memory for the new software version.As with CPU usage, it is useful How To Check Bandwidth Utilization On Cisco Router Switch #show platform port-asic stats drop Port-asic Port Drop Statistics - Summary ======================================== RxQueue Drop Statistics Slice0 RxQueue 0 Drop Stats Slice0: 0 RxQueue 1 Drop Stats Slice0: 0 RxQueue 2 For troubleshooting high CPU utilization in specific processes, refer to the appropriate link: ARP Input—ARP Input section of the document Troubleshooting High CPU Utilization Due to Processes BGP Router—High CPU due The show-running configuration privileged EXEC command on a switch stack master.

This is a requirement imposed by the SNMP protocol standard. Fed Process Cisco Additionally, if you poll several different objects in the same object group/table and get the error message, is not unusual because of this same reason. show sdm templates all Lists the SDM templates available on the switch. Figure 4-10 shows a sample output of the show processes cpu command entered with the 1-minute sort option.

How To Check Bandwidth Utilization On Cisco Router

OK Cancel Loading... Electrical Propulsion Thrust Circular Array Rotation 3-prong grounded female plug for 12-gauge wire with an 18-gauge ground wire Equation system with two unknown variables How to say "to master Esperanto"? Cisco Router High Cpu Interrupts These include: The show tech-support privileged EXEC command. Ip Input High Cpu Cache misses Packets for which there was no entry in fast switching cache.

Components Used The information in this document is based on Catalyst 3750 Switches. have a peek at these guys This schedules low priority processes to run every500 milliseconds, which provides time for you to run some commands, even if CPU usage is at100 percent. Yes No Feedback Let Us Help Open a Support Case (Requires a Cisco Service Contract) Related Support Community Discussions This Document Applies to These Products 800 Series Routers 1800 Series Integrated The load is an average value computed, by default, over five minutes. Show Memory Usage Cisco

The command reference gives a detailed explanation of the show version command. Use this UNIX script and, based on the first findings, modify the script to collect data needed for further investigation of the issue. High percentages in the show processes cpu command output If you have the output of a show processes cpu command from your Cisco device, you can use Cisco CLI Analyzerto display check over here Logging buffer size should be increased in order to capture sufficient information.

Many Parallel Express Forwarding (PXF) Punts to the RP When PXF punts too many packets to the RP, the RP may get overloaded. Arp Input High Cpu In the output, for CPU utilization for five seconds, the second number is the interrupt percentage. Note that if Cisco Express Forwarding and NetFlow are both configured on an interface, Cisco Express Forwarding will be used to make a switching decision.

If they do not relinquish the CPU, as required by MIB instrumentation rules, there is a possibility of this error message.

There are multiple background IOS processes running on timers that execute multiple times a second. This is a sample script for capturing the output from theshow version and show processes cpucommands: #!/opt/local/bin/bash ########################################### # Router's IP address # IP_ADDRESS='' # Directory where the log files will If the interrupt percentage shown in the command output is high, but the most active processes are not those shown in Table 1 , or no processes seem active enough to Troubleshoot High Cpu Usage Linux Checking Interfaces Checking the performance of the device interfaces while troubleshooting, especially while hardware faults are suspected, is as important as checking your device’s CPU and memory utilization.

The above information is meant to provide an abstract view of the current TCAM utilization In the example, the IP indirectly-connected routes resource is full even though the output shows The interval for collecting output should be five minutes. There is no workaround for this problem. this content See the “Determining Interrupt Percentage” section for how to identify a high interrupt percentage.

In this example, the proces- sor memory is shown on the first line, and the I/O memory is shown on the second line. Ultimate Australian Canal How to plot Compressibility factor Z vs Pressure P using ParametricPlot? Browse other questions tagged networking cisco cpu-usage ios or ask your own question. Even though this feature can be configured with CLI, the packets can be neither switched by hardware, nor by software, which increases the CPU utilization.

Step 2 show logging Display the contents of the standard system logging buffer. There are several reasons for high CPU utilization due to interrupts: An inappropriate switching path is configured on the router The CPU is performing alignment corrections The router is overloaded with Use the same command to find out why the packets are punted to the RP. This table explains the output fields.

High CPU Utilization due to Interrupts For more information, refer to Troubleshooting High CPU Utilization Caused by Interrupts. This means that in the example shown in Figure 4-10, 30 percent of the total avail- able CPU cycles over the past 5 seconds were used, out of which 26 percent All Rights Reserved Each queue has some reserved memory in hardware to hold packets for the queue so that one queue or packet type cannot use all the available memory.

If the largest block is larger than the half of the main:text region, use a granularity of 8. When the switch CPU is busy, management tools such as Telnet or SSH are usually not very useful. This is a sample script for capturing the output from theshow version and show processes cpucommands: #!/opt/local/bin/bash ########################################### # Router's IP address # IP_ADDRESS='' # Directory where the log files will Background Information Before you look at the CPU packet-handling architecture and troubleshoot high CPU utilization, you must understand the different ways in which hardware-based forwarding switches and Cisco IOS Software-based routers

Checking CPU Utilization Both routers and switches have a main CPU that executes the processes that constitute Cisco IOS Software. Auton/SSE Autonomous switched, silicon switched, or distributed switched packets. Known symptoms that can occur when the switch CPU is too busy: Spanning-tree topology change—When a Layer 2 network device does not receive timely spanning-tree BPDUs on its root port, it Table 2 Processes Indicating Punted Packet Handling System Process Name Packet Types HLFM address lea IP forwarding manager process Check heaps Memory collection process Virtual Exec Cisco IOS CLI process RedEarth