Home Skip to content Skip to footer Worldwide [change] Log In Account Register My Cisco Cisco.com Worldwide Home Products & Services (menu) Support (menu) How to Buy (menu) Training & Events Conventions Refer to Cisco Technical Tips Conventions for more information on document conventions. Once the TCAM enters the exception state, the system must be reloaded to get out of that state. The output in this section shows that the control queue receives a lot of packets. this contact form
disable Disable port monitoring sc0 Set span on interface sc0
An indication of such a stream is the presence of a very high number of incomplete ARP entries in the ARP table. We consider anything below 50 percent CPU utilization to be acceptable. However, a capacity issue is almost never a symptom of high CPU utilization with hardware-based forwarding switches like the Catalyst 4500.
Switch# show ip route summary IP routing table name is Default-IP-Routing-Table(0) IP routing table maximum-paths is 32 Route Source Networks Subnets Overhead Memory (bytes) connected 5 0 320 760 static 0 Cisco IOS Software Release 12.2(25)EWA2 and later have enhanced the CPU packet- and process-handling mechanism and accounting. Understand the Catalyst 4500 CPU Packet-Handling Architecture The Catalyst 4500 has an in-built quality of service (QoS) mechanism in order to differentiate between types of traffic that are destined to the Ip Input High Cpu Because the switch hardware sees the CPU receive-queue dropped packets as sent to the supervisor, the dropped packets are called Supervisor TxQueue Drop Statistics in the command output.
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 Fed Process Cisco 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. Total packet queues 16 Packets Received by Packet Queue Queue Total 5 sec avg 1 min avg 5 min avg 1 hour avg ---------------------- --------------- --------- --------- --------- ---------- Esmp 202760 Review the syslog for any unusual events.
This command is needed if the IPv6 ACL is matching on L4 protocol port numbers. Cisco Show Memory Usage If the CPU is busy 5% of the time then the CPU is idle the other 95% of the time. Route summary is enabled by default for RIP and EIGRP and disabled by default for OSPF. If your network is live, make sure that you understand the potential impact of any command.
The information in this document was created from the devices in a specific lab environment. Here is some information on the router : Cisco 1841 (revision 6.0) with 358400K/34816K bytes of memory. Troubleshooting High Cpu Utilization On Cisco Switches This section reviews the commands that an administrator uses in order to narrow down the problem of high CPU utilization. Cisco Router High Cpu Interrupts In the show platform health command output in the section Understand the show processes cpu Command on the Catalyst 4500 Switches, the Stub-JobEventSchedul and the K2CpuMan Review processes use a higher
Related Information Understanding EtherChannel Inconsistency Detection Multicast Does Not Work in the Same VLAN in Catalyst Switches CPU Utilization on Catalyst 4500/4000, 2948G, 2980G, and 4912G Switches That Run CatOS Software weblink Examine the output for information about the source, including the VLAN (200) and source MAC address (0000.0300.0101) of this packet (shown in bold text). *Mar 2 22:48:16.947: ICMP-Q:Dropped Throttle timer not Utilizing Multicast Multi-Layer Switching (MMLS), RPF traffic is usually forwarded by the hardware within the switch. The first line of output from the show processes cpu command displays the percentages of the CPU cycles. How To Check Bandwidth Utilization On Cisco Router
This is a requirement imposed by the SNMP protocol standard. After you have determined that the CPU load is abnormally high and you decide to investigate further, you generally have to resort to platform-specific troubleshooting commands to gain more insight into Because of this, it is quite normal for routers to be running at high CPU loads during peaks in network traffic. http://blackplanetsupport.com/high-cpu/show-cpu-usage-on-cisco-router.html This equates to 300 spanning-tree port instances.
The show interface command gives basic information on the state of the interface and the traffic rate on the interface. Hulc Led Process High Cpu Each of the platform-specific processes has a target/expected utilization of the CPU. A Layer 2 protocol with its own queue and used for protocol packets such as LACP and so on.
switch# show processes cpu sorted | grep cli 3965 23734 17872 1328 0.0% 0.1% 0.7% - clis 4024 3047 1256 2426 0.0% 0.0% 0.0% - diagclient 4094 787 258 3052 0.0% In a Layer 3 network, a routing topology could change. 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 Troubleshoot High Cpu Usage Linux So in this example, these are: 8622/25 - 8622 is PID for IOSd and 25 implies that this process is using 25% CPU. 5753/12 - 5733 is PID for FED and
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 Non-RPF Multicast Traffic Multicast routing (unlike unicast routing) is only concerned with the source of a given multicast data stream. TCP Timer—TCP Timer section of the document Troubleshooting High CPU Utilization due to Processes TTY Background—TTY Background section of the document Troubleshooting High CPU Utilization due to Processes Virtual EXEC—High CPU http://blackplanetsupport.com/high-cpu/troubleshoot-high-cpu-usage-cisco-router.html High CPU Due to Policy Based Routing Policy Based Routing (PBR) implementation in Cisco Catalyst 3750 switches has some limitations.
Modular IOS In Cisco Catalyst 6500 series switches that run modular IOS software, the normal CPU utilization is a little greater than non-modular IOS software. This stops from adding new routes to the TCAM. Once this space is exceeded, the packets become switched in software. If the highly active process is K2CpuMan Review , issue the show platform cpu packet statistics command in order to identity the type of traffic that hits the CPU.
On all modules that do not require a DFC, the firmware runs on a specific processor called the Line Card Processor (LCP). Prerequisites Requirements There are no specific requirements for this document. All other IP packets that had a TCAM miss are punted to the CPU. Therefore, the impact on the CPU is not as great as before the improvement.
The other CPU is the Layer 3 routing engine CPU, which is called the MSFC or the Route Processor (RP). The output of the show platform health command shows you that the CPU sees a lot of new MAC addresses. Switch#show platform health %CPU %CPU RunTimeMax Priority Average %CPU Total Target Actual Target Actual Fg Bg 5Sec Min Hour CPU --- Output suppressed. 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
System image file is "flash:c1841-adventerprisek9-mz.151-4.M1.bin" The system has just been updated to IOS 15.4M1 from IOS 13. In this command output, you find that the top process is the Cat4k Mgmt LoPri : Switch#show processes cpu CPU utilization for five seconds: 99%/0%; one minute: 99%; five minutes: 99% 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. Refer to Cisco bug ID CSCeg55298 (registered customers only) .
Here is an example: Router-sp#test monitor session 1 add rp-inband rx Note:In Cisco IOS 12.2 SX releases, the command has been changed to test monitor add 1 rp-inband rx. These processes process control plane as well as data packets that need to be software-switched or processed. Any examples, command display output, and figures included in the document are shown for illustrative purposes only. Issue the show processes cpu command.
High CPU Utilization due to Fragmentation Reassemblies can drive up the CPU very high if the CPU has to reassemble a large number of packets. Inband Driver show hardware internal cpu-mac inband [counters | stats | events] Command Use this command in order to check for drops in CPU path, XOFF flow control, maximum CPU receive