The output of the show platform health command confirms the use of the CPU in order to process CPU-bound packets. This schedules low priority processes to run every 500 milliseconds, which provides time for you to run some commands, even if CPU usage is at 100 percent. Handles network management traffic that is destined to the CPU of the switch Examples include Telnet, HTTP, and Simple Network Management Protocol (SNMP) traffic. The more instances and the more active interfaces, the greater the CPU utilization. http://twaproductions.com/high-cpu/show-cpu-usage-cisco-3750.html
A spike is also a normal reaction to a topology change in a large Layer 2 network. When it polls the switches, it triggers the CPU spikes. 0 Chipotle OP Jeremy.Spencer Aug 12, 2014 at 3:13 UTC Tdawg1982 wrote: What would you recommend?Depends on your On the Supervisor Engine 2, the FIB table is generated and programmed into the PFC. This document provides details about the CPU packet-handling architecture and shows you how to identify the causes of high CPU utilization on these switches. learn this here now
Once this space is exceeded, the packets become switched in software. This command dumps the last packet received by the sink, which is IOSd in this example. You can display the packets captured with the show mgmt-infra trace messages fed-punject-detail command. 3850-2#show mgmt-infra trace messages fed-punject-detail[11/25/13 07:05:53.814 UTC 2eb0c9 5661]00 00 00 00 00 4e 00 40 07 The PCI memory is used for memory access to the GT64260 controller on the PRP mainboard for the PCI buses connected to it.
Table 1 Processes Associated with Network Packet Processing System Process Name Packet Types IP Input IP packets (includes ICMP) IGMPSN IGMP snooping packets ARP Input IP ARP packets SNMP Engine SNMP I included "sh proc cpu" but used "sh proc cpu sorted" because it is showing the processes being used first and 0 past what I showed in the screen shot number I included "sh proc cpu" but used "sh proc cpu sorted" because it is showing the processes being used first and 0 past what I showed in the screen shot number Show Memory Usage 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.
However, this older command was a part of the show tech-support command in Cisco IOS Software releases earlier than Cisco IOS Software Release 12.2(20)EWA. Refer to Understanding ACL on Catalyst 6500 Series Switches for additional information about TCAM utilization and optimization. You can police traffic on the MAC address, the IPv4 header, the IPv6 header (if IPv6 is supported on the switch), or the Layer 4 port number. http://www.cisco.com/c/en/us/support/docs/routers/10000-series-routers/15095-highcpu.html In the output, for CPU utilization for five seconds, the second number is the interrupt percentage.
This is a hardware limitation in the Catalyst 3750 Series Switches. Cat4k Mgmt Lopri High Cpu The show processes command's output provides two numbers separated by a slash (for example, 4%/4%) for the CPU utilization over the last five seconds. These redirects can consume a great deal of CPU resources. Or are there spikes of high utilization, and then a return to the baseline levels?
number of unicast mac addresses: 6K number of IPv4 IGMP groups + multicast routes: 1K number of IPv4 unicast routes: 8K number of directly-connected IPv4 hosts: 6K number of indirect IPv4 Here the process is broken into steps: Enable detail tracking. Hulc Led Process High Cpu Use the show processes cpu command in order to identify the CPU utilization on the Catalyst 4500 switch. Ip Input High Cpu Only three packets are shown.
Switch#show platform cpu packet statistics !--- Output suppressed. Check This Out The switch counts every IP packet that the hardware punts to the CPU for IP routing. Be ready to enter the undebug all privileged EXEC command to stop any packet flooding on the console. Review the syslog for a physical link losing and gaining connectivity. How To Check Bandwidth Utilization On Cisco Router
OAL permits or drops packets in hardware on the PFC3. The enablement helps you to narrow down the offending links very quickly. This is an example of turning on the CPU queues one at a time until console floods. Source All of the devices used in this document started with a cleared (default) configuration.
This is because if the device (for example, a modem) attached to this line sends some unsolicited data, the Exec process starts on this line. Cisco Fed Process You can then look at the packets in these ways: SPAN MSFC port 15/1 or 16/1 SPAN sc0 SPAN MSFC Port 15/1 or 16/1 Set up a SPAN session in which Utilizing Multicast Multi-Layer Switching (MMLS), RPF traffic is usually forwarded by the hardware within the switch.
How are those numbers interpreted? Note:On the Supervisor Engine 1, reflexive ACLs rely on dynamic TCAM entries to create hardware shortcuts for a particular flow. LCP Schedular and DFC Module In a Distributed Forwarding Card (DFC), the lcp schedular process that runs on a high CPU is not an issue and does not pose any problem How To Check Utilization On Cisco Router Interface All rights reserved.
PBR applies only to unicast traffic. The switch can pass traffic as usual since everything is in hardware, but the CPU can take a beating if it tries to figure out which traffic to send through. For more information on the use of debugging commands, refer to Using Debug Commands. http://twaproductions.com/high-cpu/cisco-pix-high-cpu-usage.html Commonly, high CPU utilization is caused by a security issue, such as a worm or virus operating in your network.
Switch#show platform health %CPU %CPU RunTimeMax Priority Average %CPU Total Target Actual Target Actual Fg Bg 5Sec Min Hour CPU !--- Output suppressed. Search IT Knowledge Exchange Join / Login IT Knowledge Exchange a TechTarget Expert Community Questions & Answers Discussions Blogs Tags Welcome to TechTarget's expert community for technology professionals. Note:Since ip icmp redirects is a default command, it is not visible in the show running-configuration command output. The switch works as expected and sends the packets to the CPU for host address learning.
On the supervisor engine that runs CatOS, the output looks like this: Switch> (enable) show processes cpu CPU utilization for five seconds: 99.72% one minute: 100.00% five minutes: 100.00% PID Runtime(ms)