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Cisco Troubleshooting High Cpu Usage


Switch# show sdm templates all Id Type Name 0 desktop desktop default 1 desktop desktop vlan 2 desktop desktop routing 3 aggregator aggregate default 4 aggregator aggregate vlan 5 aggregator aggregate It is normal for the CPU to go high due to this SNMP ENGINE process. Use of CEF FIB Table Space in the Flow Cache Table The Supervisor Engine 1 has a Flow Cache Table that supports 128,000 entries. Home Skip to content Skip to navigation Skip to footer Cisco.com Worldwide Home Products & Services (menu) Support (menu) How to Buy (menu) Training & Events (menu) Partners (menu) Guest Search his comment is here

Network Symptoms Caused by High CPU Utilization A CPU that is too busy affects the ability of the system processes to execute as expected. The system works by sampling the processor location every four milliseconds. Be ready to enter the undebug all privileged EXEC command to stop any packet flooding on the console. For troubleshooting high CPU utilization due to Netflow version 7, configure mls nde sender version 5, as the Netflow export is performed by the SP, which is the default for version check these guys out

Troubleshooting High Cpu Utilization On Cisco Switches

See the “Debugging Packets from the Switch CPU Receive Queues” section. If one of the listed system processes is the most active process in the CPU, it is likely that the corresponding type of network packet is flooding the CPU. When PBR and reflexive access list are in the path of a traffic flow, the packet is software switched, which requires an additional CPU cycle. See the examples in the “When High CPU Utilization Is a Problem” section.

The L3 aging process utilization goes high since it must perform FIB lookup for all destination and source ifindex values. 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 Catalyst 6500 Series Switches Share Information These sections tell you how to identify and troubleshoot the cause: Identifying the Cause as System Process or Network Traffic Analyzing Network Traffic Debugging Active Processes Note Always refer to the Show Memory Usage Cisco SNMP polling activities, particularly MIB walk—the Cisco IOS SNMP engine executes SNMP requests.

The second is to send/receive packets to/from the switching hardware. Fast switching is enabled by default. Once the source device's MAC address is found, the corresponding IP address can be found by checking the output of the show ip arp command. networking cisco cpu-usage ios share|improve this question edited Jan 15 '12 at 10:42 Lucas Kauffman 15k53876 asked Jan 14 '12 at 16:07 Kedare 1,17021629 1 Have you had a look

Spanning tree reconverges in the Layer 2 network. Hulc Led Process For more information on CPU utilization by the BGP Scanner process, refer to the High CPU due to BGP Scanner section of Troubleshooting High CPU Caused by the BGP Scanner or The SNMP process has a low priority and should not affect any functionality on the switch. Issue the terminal length 0 command.

Cisco Router High Cpu Interrupts

Prerequisites Requirements Troubleshooting high CPU utilization on Cisco routers requires understanding of Cisco IOS® software switching paths. http://www.cisco.com/c/en/us/support/docs/switches/catalyst-3750-series-switches/68461-high-cpu-utilization-cat3750.html By default, the process scans every 60 seconds. Troubleshooting High Cpu Utilization On Cisco Switches The temporary workaround is to disable IGMP snooping on the Catalyst 3750 stack, or disable MAC-based query on the switch connected to the 3750 stack. Ip Input High Cpu Use to determine how many additional TCAM resources are needed to hold the current network routes.

Move directories despite of errors Is there a reason why similar or the same musical instruments would develop? http://smartnewsolutions.com/high-cpu/windbg-high-cpu-usage.html show platform ip unicast counts Shows routes that are not programmed into the TCAM. The CPU time utilized by spanning tree varies depending upon the number of spanning-tree instances and the number of active interfaces. Two other important numbers are shown on the same output line: the average utilization for the last 1 minute (6 percent in this example) and the average utilization for past 5 How To Check Bandwidth Utilization On Cisco Router

Broadcast suppression is disabled by default. When the debugging session is over, the debug messages are in the system log. It is the second number in the 5 second utilization percentage. http://smartnewsolutions.com/high-cpu/dwm-high-cpu-usage.html It spiked to 87 percent within the past hour.

The SDM templates can be selected in order to provide maximum system usage for some functions, or to use the default template in order to balance resources. Fed Process Cisco In some respects, STP is an early protocol that was initially developed for slow software-based bridge specifications (IEEE 802.1D), but STP can be complicated in order to implement it successfully in The first packet for this destination (or flow - depending on the type of fast switching configured) will be processed.

This command is not as useful as the show controllers cpu-interface command because the output shows numbers for the receive queues instead of names, and it shows only the discards.

Broadcast traffic that is denied in an RACL Traffic that is denied in a unicast RPF (uRPF) check, ACL ACE This uRPF check applies to the Supervisor Engine 2 with PFC2 Unless you configure OAL, the process of packets that require logging takes place completely in software on the MSFC3. Headphone symbol when headphones not in use Where can I find Boeing 777 safety records? Arp Input High Cpu In general when this is high it means that traffic is overwhelming the firewall and the firewall can’t keep up.

Your processes are using 2%, the rest is being caused by the normal flow of traffic through the router. In the output, for CPU utilization for five seconds, the second number is the interrupt percentage. The switch counts every IP packet that the hardware punts to the CPU for IP routing. check over here 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 Catalyst 3750 Series Switches Catalyst 3750-E

The Virtual Exec process is responsible for the VTY lines (Telnet sessions). In order to use PBR, you must first enable the routing template with the sdm prefer routing global configuration command. It does not cause extra load to the CPU. This list details some of the possible reasons for high CPU utilization in the Exec process: There is too much data sent through the console port.

Step 2 no logging console Disable logging to the console terminal. Step 4 service timestamps debug datetime msecs localtime Configure the system to apply a timestamp to debugging messages or system logging messages. The process simply grabs all unused CPU cycles, as long as no higher priority process requires them. In this example, the CPU spiked to 100 percent 46 hours ago, shortly after the switch was rebooted.

For example, Queue 0 in this output corresponds to rpc in the previous output;. After you enter the command, allow some time for the buffered debug messages to subside and for the debugging message buffer to empty. Updated: May 29, 2008Document ID: 41120 Enterprise Networks Products Solutions Design Zone Architecture Services Case Studies Community Information For Small Business Midsize Business Service Provider Browse other questions tagged networking cisco cpu-usage ios or ask your own question.

Monitoring IP Traffic Counts The switch counts all IP packet types received by the CPU. Modular IOS software pays a price per activity more than it pays a price per packet. Terminal length is set to something short (15 in this case), and the "q" character is sent only by prompt. Cisco Product Security Advisories and Notices contains information on detection of the most likely causes and specific workarounds.

UNIX Shell Script for Periodically Collecting Data This appendix describes a simple script for periodically capturing data from the router. Conventions Refer to Cisco Technical Tips Conventions for more information on document conventions. The RP CPU performs functions that include: Builds and updates the Layer 3 routing and Address Resolution Protocol (ARP) tables Generates the Cisco Express Forwarding (CEF) Forwarding Information Base (FIB) and We'll email youwhen relevant content isadded and updated.

Do not match ACLs that permit packets destined for a local address. The RSS feeds are a free service and Cisco currently supports RSS Version 2.0. NAT Translations NAT utilizes both hardware and software forwarding.