http://www.cisco.com/en/US/products/hw/switches/ps663/products_tech_note09186a00804cef15.shtmlCategories: Switching No TrackBacks TrackBack URL: http://www.ryanhicks.net/cgi/mt/mt-tb.cgi/2 Leave a comment Name Email Address URL Remember personal info? Attachments: signature.asc (0.82 KB) rupeni_t at usp Sep4,2011,1:02PM Post #5 of 5 (7660 views) Permalink Re: Cat 4500 series High CPU [In reply to] Thks will try these out. -----Original Message----- From: Mark In the output, notice that the K2CpuMan Review process uses most of the CPU cycles. Input Acl Err Not used. http://chatflow.net/high-cpu/system-exe-high-cpu.html
You may expect the sourcing device to act on the ICMP redirect that the Catalyst 4500 sends and change the next hop for the destination. Contact Gossamer Threads Web Applications & Managed Hosting Powered by Gossamer Threads Inc. You can see this error message in the show logging command output. The output of the show platform health command confirms the use of the CPU in order to process CPU-bound packets.
The switch also uses the feature TCAM for security features like IP Source Guard (IPSG) for dynamic ACLs. I know packets are going to the processor, but they are not getting logged by the debug command we just executed. This logging is not enabled by default.
In order to prevent this problem, remove the log keyword from the ACLs. Table0-1 Catalyst 4500 Software Queue Description Queue Name Packets Queued MTU Check Fail Packets that must be fragmented because the output interface MTU size is smaller than the size of the Table 3– TCAM Capacity on Catalyst 4500 Supervisor Engines/Switches Product Feature TCAM (per Direction) QoS TCAM (per Direction) Supervisor Engine II+/II+TS 8192 entries with 1024 masks 8192 entries with 1024 masks Command To Check Cpu Utilization In Cisco Switch Review this document and the section Troubleshoot Common High CPU UtilizationProblems for common causes.
Article by: jorge Network ports are the threads that hold network communication together. L2 Router To Cpu, 7 The packets that hit those ACEs are processed in software, which causes high CPU utilization. He has three and half years of experience in LAN switching technologies. show processes cpu sorted [ 5sec ] Shows percentages for CPU utilization and CPU time spent on interrupts and lists the most active system processes in order of CPU utilization.
Examples of software-forwarded packets are IPX or control packets, such as BPDUs. Sa Miss Cisco 4500 If the information provided in this section does not resolve the high CPU utilization problem, see the “Debugging Active Processes” section. The first commands I ran from the Cisco troubleshooting guide were:
Switch#debug platform packet all receive buffer
platform packet debugging is on
Switch#show platform cpu packet buffered See the “CPU Receive Queues” section for more information about CPU queues.
Therefore, use these releases on your Catalyst 4500 deployments. Host Learning The Catalyst 4500 learns the MAC addresses of various hosts, if the MAC address is not already in the MAC address table. K5cpuman Review High Cpu My SPAN session looked like this:
Switch(config)#monitor session 1 source interface Gi2/24
Switch(config)#monitor session 1 destination interface Gi2/48
I had a laptop connected to the same Vlan Cisco Iosd Process The output shows the packets are being received on interface Gigabit Ethernet 1/0/3 (shown in bold text).
This ability of the network to remain stable is critical information that you must understand. http://chatflow.net/high-cpu/dwm-exe-high-cpu-windows-10.html TagMan-RecreateMtegR 1.00 0.00 10 4 100 500 0 0 0 0:00 K2CpuMan Review 30.00 27.39 30 53 100 500 42 47 42 4841: K2AccelPacketMan: Tx 10.00 8.03 20 0 100 500 Switch# show processes cpu sorted CPU utilization for five seconds: 93%/7%; one minute: 94%; five minutes: 96% PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process 49 2095141161223088784 171 84.39% 84.85% As more tasks are being offloaded to those microcontrollers there is an increase in communication between the CPU and the microcontrollers. Iosd Process 4500
The use of the word partner does not imply a partnership relationship between Cisco and any other company. (1110R) Any Internet Protocol (IP) addresses used in this document are not intended show interface stats will normally show what traffic is switched by which mechanism. Be aware of the following: •Much of this information is based on Cisco IOS Release 12.2(54)SG. navigate here Used by Cisco system processes to communicate across the stack.
Some of the packets that are sent for process can be essential for the network operation. Show Platform Cpu Packet Buffered See the “Configuring STP” chapter in the switch software configuration guide. These include: The show tech-support privileged EXEC command.
If we want to see where packets are coming from that are destined for the CPU, we execute debug platform packet all count. If you don't need your routers/L3 switches to send back this IGMP Redirect message, you'd better to put "no ip redirects" on all your routed interfaces (no switchport physical interfaces and The Catalyst 4500 CPU performs these functions: Manages configured software protocols, for example: Spanning Tree Protocol (STP) Routing protocol Cisco Discovery Protocol (CDP) Port Aggregation Protocol (PAgP) VLAN Trunk Protocol (VTP) K2cpuman Review Figure 2 shows the troubleshooting methodology to use in order to identify the root cause of the Catalyst 4500 high CPU utilization.
If there is an excessive number of new MAC addresses for the switch to learn, high CPU utilization can result. Upon further examination, all of the 1.8 million packets have the router alert option defined! 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 Share Information his comment is here The lack of response causes the Catalyst 4500 to spend a lot of CPU cycles on the generation of these ICMP redirects for all the packets that the Catalyst forwards via
Even an 87-percent spike might be acceptable, depending on the cause. Policing can deny ingress traffic, limit it to a specific bits-per-second rate, or permit some traffic while limiting other traffic. Figure 2 indicates this requirement. In this example, the CPU spiked to 100 percent 46 hours ago, shortly after the switch was rebooted.
Nothing stands out exceptthe show proc cpu shows Cat4k Mgmt LoPri is taking up 70-80% of the CPU. To troubleshoot high CPU utilization, look for a higher number in the %CPU actual column in the command's output. Please contact support. 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
Determine baseline CPU usage, and identify when spikes occur. A weblog about networking problems, issues, and discoveries by Ryan Hicks. Third party trademarks mentioned are the property of their respective owners. Figure 2 – High CPU Utilization Troubleshooting Methodology on Catalyst 4500 Switches The general troubleshooting steps are: Issue the show processes cpu command in order to identify the Cisco IOS processes
Switch(config)#interface range gigabitethernet 5/1 - 48 Switch(config-if-range)#logging event link-status Switch(config--if-range)#end Switch#show logging !--- Output suppressed. 3w5d: %LINK-3-UPDOWN: Interface GigabitEthernet5/24, changed state to down 3w5d: %LINK-3-UPDOWN: Interface GigabitEthernet5/24, changed state to up sw forwarding—Used for packets punted by the hardware for the CPU to route. Configure IP phone ports with a voice VLAN configuration.