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Cisco Router High Cpu Interrupts


The more instances and the more active interfaces, the greater the CPU utilization. In general, the larger the Layer 2 or Layer 3 network, the greater the demand on the CPU to process network-related traffic. 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 igmp snooping—A queue for IGMP packets. weblink

From this output, you can see that the K2CpuMan Review process, a job to handle CPU-bound packets, uses up the CPU: Switch#show platform health %CPU %CPU RunTimeMax Priority Average %CPU Total Privacy Reply Processing your reply... This is an example of turning on the CPU queues one at a time until console floods. The message instructs PC A to send the packets destined to the web server via Router, instead of via Catalyst 4500.

Cisco Router High Cpu Interrupts

CPU Performing Alignment Corrections Alignment errors are caused by misaligned reads and writes. The second number, 0%, shows the percentage of time at the interrupt level in the past 5 seconds. Briefly explain why Cisco IOS troubleshooting commands/tools need proper handling. For additional information, refer to: 100 Questions and Answers about Internet Threats Cisco Product Security Advisories and Notices Cisco Threat Control Make sure all debugging commands in your router are turned

  • Verify if any of the interfaces have long access lists configured.
  • Some of the common reasons for high CPU utilization due to process-switched packets are: A high number of spanning-tree port instances ICMP redirects; routing packets on the same interface IPX or
  • If the link moves or breaks, this answer won't help anyone in the future. –Tim Post♦ Jan 14 '12 at 21:21 The important parts of a 5 page troubleshooting
  • Not used during normal operation.
  • 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
  • The system works by sampling the processor location every four milliseconds.
  • In a Layer 3 network, a routing topology could change.
  • The sorted option is really a beneficial option in the “show processes cpu” command which can help you to find out the load of your Cisco router or a Switch over
  • The cpmCPUTotal5minRev MIB object provides a more accurate view of the performance of the router over time than the MIB objects cpmCPUTotal1minRev and cpmCPUTotal5secRev .
  • In order to resolve the issue, change the STP mode to Multiple Spanning Tree (MST).

show platform ip unicast statistics CPUAdj output identifies punted packets. debug platform cpu-queue queue Debugs CPU queues. Refer to Spanning Tree PortFast BPDU Guard Enhancement for more information. Ip Input High Cpu With a longer aging time, the switches retain the device MAC addresses in the table for a longer period of time before the age out.

These can be packets destined for the router, or packets for which there was no entry in the fast switching cache. routing protocol—Used for routing protocol packets received by other network devices. HACL 0 More than 50 % Too many ACLs configured on the switch in a short time period. Issue the show platform cpu packet statistics command in order to show only the nonzero events.

In order to see which of the platform-specific processes use the CPU under the context of Cat4k Mgmt HiPri and Cat4k Mgmt LoPri , issue the show platform health command. Cisco Fed Process UDLD—Detects unidirectional links and prevents forwarding loops. asked 4 years ago viewed 9560 times active 4 years ago Related 2Cisco ios config0Cisco IOS: One SSID doesn't pull from the correct DHCP pool1Issue forwarding port through Cisco 881 router0Why EtherChannel links bounce—When the network device at the other end of the EtherChannel does not receive the protocol packets required to maintain the EtherChannel link, this might bring down the link.

Show Memory Usage Cisco

If they do not relinquish the CPU, as required by MIB instrumentation rules, there is a possibility of this error message. The debugging techniques are different for these two root causes. Cisco Router High Cpu Interrupts Switch#show platform health %CPU %CPU RunTimeMax Priority Average %CPU Total Target Actual Target Actual Fg Bg 5Sec Min Hour CPU !--- Output suppressed. How To Check Bandwidth Utilization On Cisco Router Doherty Mon, 05/19/2008 - 15:58 Not 100% positive, but don't recall whether CPU on most routers can be seen any more current than the average for the last 5 seconds.The particular

A large number of MAC table flushes and subsequent relearning can result. have a peek at these guys Also, review the Configuring Network Security with ACLs configuration guideline in order to optimize the ACL configuration and programming in the hardware. Identify the type of packets that are flooding the CPU. Make sure the memory is freed by doing unprofile all show interfaces switching Command This command is used for determining active switching paths on interfaces. Hulc Led Process High Cpu

The CPU time utilized by spanning tree varies depending upon the number of spanning-tree instances and the number of active interfaces. Therefore, the output of the show logging exec command should be checked first for any errors related to the process which consumes lots of CPU cycles. Fast Fast switched packets. check over here CPU Profiling CPU profiling is a low-overhead way of determining where the CPU spends its time.

When you enable the secondary IP addresses, IP redirect is automatically disabled. How To Check Utilization On Cisco Router Interface show interfaces stat Command This command is a summarized version of the show interfaces switching command. SNMP PDU processing (MIB object queries) are supposed to be performed in a single CPU time quantum to ensure that each object in the PDU is retrieved as if simultaneously.

Run this script every five minutes if the high CPU utilization problem appears often and does not last long.

Many Parallel Express Forwarding (PXF) Punts to the RP When PXF punts too many packets to the RP, the RP may get overloaded. This is some sample output: Alignment data for: 4500 Software (C4500-DS40-M), Version mis-aligned RELEASE SOFTWARE (fc1) Compiled Tue 31-Mar-98 15:05 by jdoe Total Corrections 33911, Recorded 2, Reads 33911, Writes 0 Depending on the model and the type being used this can range from 5 to 40% If the switch is stacked then, at a minimum, the CPU will operate normally a Ip Input High Cpu Cisco 3750 Otherwise, you can run it every 15 or 30 minutes.

Look at the number of new flows per second. Step 2 no logging console Disable logging to the console terminal. There are 72 integers on the top of the graph written vertically.  The left most column is the most recent utilization 37%.  Reading toward the right, an hour ago, the utilization http://supportcanonprinter.com/high-cpu/displaylinkmanager-exe-high-cpu.html Commands for Obtaining More Information These commands provide more information about the problem: show processes cpu show interfaces show interfaces switching show interfaces stat show ip nat translations show align show

Note:Only Distance Vector Multicast Routing Protocol (DVMRP) tunnel interfaces are supported for multicast routing in the Catalyst 3750.