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Cisco Router High Cpu Interrupts


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) An IPv6 packet with a multicast destination address DST, consisting of the sixteen octets DST[1] through DST[16], is transmitted to the Ethernet multicast address whose first two octets are the value CPU utilization spikes caused by a known network event or activity are not problems. In the case of Rapid STP (RSTP) (IEEE 802.1w) or MST (IEEE 802.1s), the entries immediately age out if the TCN comes from another switch. http://technologyprometheus.com/high-cpu/troubleshooting-high-cpu-utilization-caused-by-interrupts.html

Switch then performs IPv6 multicast-address based bridging in hardware, which prevents these packets to be processed by software. This was fixed through CSCuo14829 in IOS versions 3.3.3 and 3.6.0 and later. This output delineates two processes that use the CPU: Cat4k Mgmt HiPri and Cat4k Mgmt LoPri). The principle is the same: the first packet of a flow goes to software.

Cisco Router High Cpu Interrupts

Use to determine how many additional TCAM resources are needed to hold the current network routes. There are multiple background IOS processes running on timers that execute multiple times a second. This traffic is handled in hardware on the Supervisor Engine 2 with PFC2 and the Supervisor Engine 720 with PFC3. The number of CPU queues is increased to 64 on the E-series switches.

The show cef not-cef-switched command shows why packets are punted to the MSFC (receive, ip option, no adjacency, etc) and how many. This command is not configured by default. The way you can gather more information depends on the routing protocol you have configured. How To Check Bandwidth Utilization On Cisco Router Enter the command multiple times to review active queue discards.

See the “Debugging Packets from the Switch CPU Receive Queues” section. SNMP query of the flash file system on the switch. Ethernet broadcast storms. The permanent solution is to upgrade to the latest Cisco IOS version.

When we did a sh proc cpu on the switches the iosd process had alreade added all the child/forked processes but the sh proc cpu command added all the child/firked processes Show Memory Usage Cisco Even though an access switch is disinterested in the Layer 3 control traffic, the traffic is still punted to CPU because of th control interception mechanism. These switches make forwarding decisions in hardware, not in software. In case if CPU is High on SP (Switch Processor), apply workaround below. 6500(config)#mls rate-limit ipv6 mld 10 1 If you are unable to determine reason based on information provided in

Hulc Led Process High Cpu

Since the administrator has configured IPX or AppleTalk routing, identification of the root cause should be straightforward. http://www.cisco.com/c/en/us/support/docs/switches/catalyst-6500-series-switches/63992-6k-high-cpu.html One of the reasons that different ranges and models within those ranges will differ in the baseline utilization is differences in design. Cisco Router High Cpu Interrupts The interrupt percentage is minor compared to the percentage of CPU utilized by the SNMP engine system process. Ip Input High Cpu This non-RPF traffic is still necessary in some cases, and is required by the MSFC CPU (at process level) for the PIM Assert mechanism.

Context-based Access Control (CBAC) uses NetFlow shortcuts in order to classify traffic that requires inspection. his comment is here Although the RSPAN VLAN does not learn any MAC addresses, a copy of the packet with unknown source MAC is still sent to and dropped at the CPU. all Rate Limiting for both Unicast and Multicast packets layer2 layer2 protocol cases multicast Rate limiting for Multicast packets unicast Rate limiting for Unicast packets Here is an example: Router(config)#mls rate-limit With only this information, you know that the spanning tree process consumes a sizable portion of the CPU cycles. Cat4k Mgmt Lopri High Cpu

TagMan-RecreateMtegR 1.00 0.00 10 0 100 500 0 0 0 0:00 K2CpuMan Review 30.00 37.62 30 53 100 500 41 33 1 2:12 K2AccelPacketMan: Tx 10.00 4.95 20 0 100 500 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. Requirements There are no specific requirements for this document. http://technologyprometheus.com/high-cpu/system-exe-high-cpu.html This leads to high CPU in the Catalyst 3750 Switch.

Therefore, TCAM overflow is the cause of this high CPU utilization issue. Show Tcam Utilization 6500 Enter to determine if you can reallocate TCAM resources as needed. The interval for collecting output should be five minutes.

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

The show processes cpu command output counts that utilization under Cat4k Mgmt HiPri . This is outlined within the Cisco bug ID CSCdr74908 (registered customers only) . Unusual activity related to a process results in an error message in the log. How To Check Utilization On Cisco Router Interface Note: There are two ASICs: 0 and 1.

Check CPU Utilization If the CPU utilization is high, issue the show processes cpu command first. Auton/SSE Autonomous switched, silicon switched or distributed switched packets. Your only concern having high CPU in other processes other than show commands. navigate here The process simply grabs all unused CPU cycles, as long as no higher priority process requires them.

This debugging section will help you to identify other examples and describe how to take corrective action. RPF makes use of the existing unicast routing table to determine the upstream and downstream neighbors. Notice line that starts with 0070. Router#monitor session 1 destination interface 3/2 Now, go to the SP console.

Because of this, the table becomes full, the L3 aging process goes high, and the CPU usage hits 100%.