In order to determine the type of traffic that hits the CPU, issue the show platform cpu packet statistics command. For example, this is the output of the netdr capture, which shows that the IPv4 TTL is 1: Source mac 00.00.50.02.10.01 3644 Dest mac AC.A0.16.0A.B0.C0 4092 Protocol 0800 4094 Interface Gi1/8 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. Use an enhanced version of STP, such as MST. http://3swindows.com/high-cpu/ccmexec-exe-high-memory-usage.html
I suspect the 10% value you note from the graph display of the right most graphic symbols is due to compression of white space. The mechanism makes the differentiation on the basis of the Layer 2 (L2)/Layer 3 (L3)/ Layer 4 (L4) packet information. Diagnosing Hardware Issues Using Cisco IOS Commands Chapter 4: Selective Information Gathering Testing Network Connectivity Using Ping and Telnet Collecting Real-Time Information Using Cisco IOS debug Commands Diagnosing Hardware Issues Using Step 2 show logging Display the contents of the standard system logging buffer. http://www.cisco.com/c/en/us/support/docs/routers/10000-series-routers/15095-highcpu.html
The CPU utilization history shows when the CPU is consistently receiving network packets, but it does not show the cause. The CPU time utilized by spanning tree varies depending upon the number of spanning-tree instances and the number of active interfaces. Auton/SSE Autonomous switched, silicon switched or distributed switched packets. By default, ICMP redirect is enabled.
The Supervisor packet Engine has 16 queues in order to handle various types of packets or events. Each queue has some reserved memory in hardware to hold packets for the queue so that one queue or packet type cannot use all the available memory. High CPU Due to Excessive ARP Requests High CPU utilization of the Address Resolution Protocol (ARP) input process occurs if the router has to originate an excessive number of ARP requests. Ip Input High Cpu To resolve the problem, you need to find the source of the packets, and either stop the flow, or modify the switch configuration.
By submitting you agree to receive email from TechTarget and its partners. These tasks include: A check of the next hop that is referenced in the router BGP table Verification that the next-hop devices can be reached Thus, a large BGP table takes Note:Do not place this access list on a transit interface. It is normal for the CPU to go high due to this SNMP ENGINE process.
This is just one example of a possible root cause for high CPU utilization. Fed Process Cisco Both tables can be very large and, thus, consume CPU cycles. Router#show processes cpu | exclude 0.00 CPU utilization for five seconds: 91%/50%; one minute: 89%; five minutes: 47% PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process 5 881160 79142 11133 To learn about route summary, see the “Configuring IP Unicast Routing” chapter in the software configuration guide (only Layer 3 switches).
In the previous example, the CPU utilization was between 40 and 56 percent for the past 37 hours. http://www.cisco.com/c/en/us/support/docs/switches/catalyst-4000-series-switches/65591-cat4500-high-cpu.html 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 Show Memory Usage Cisco These can be packets destined for the router, or packets for which there was no entry in the fast switching cache. How To Check Bandwidth Utilization On Cisco Router 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.
In order to resolve the high CPU utilization issue, enable route summarization. http://3swindows.com/high-cpu/command-to-check-cpu-utilization-in-cisco-switch.html In order to understand which platform-specific process consumes the CPU, issue the show platform health command. 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 6500 Series Switches Share Information Therefore, when the switches make the forwarding or switching decision for most frames that pass through the switch, the process does not involve the supervisor engine CPU. Hulc Led Process High Cpu
Continue to enable the debugging of the different CPU queues until the console is flooded. Issue the show platform cpu packet statistics command in order to show only the nonzero events. There is no impact on performance of the switch, with or without ACLs in the forwarding path. his comment is here This is useful if the packets are all the same type or originating from the same source.
You can expect high CPU utilization for short durations because of the BGP Scanner process on a router that carries a large Internet routing table. Arp Input High Cpu Troubleshoot Common High CPU Utilization Problems This section covers some of the common high CPU utilization problems on the Catalyst 4500 switches. Without STP, frames loop and/or multiply indefinitely.
If the IPv4 unicast indirectly-connected routes output is at maximum, the IP routing database is full, and packets to other IP addresses are punted. 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 Root Guard—Enforces root bridge placement in the network. Ip Input High Cpu Cisco 3750 You can eliminate these issues from your troubleshooting steps.
To resolve TCAM utilization issues, you should choose the appropriate SDM template for the switch application. Issue this command in order to see these packets: show buffers input-interface Router#show buffers input-interface gigabitethernet 4/1 packet Buffer information for Small buffer at 0x437874D4 data_area 0x8060F04, refcount 1, next 0x5006D400, The amount of data transferred through each VTY session can be verified with the show tcp vty
Use Cisco IOS Software Release 12.0(22)S3 or later when you poll c7500 or GSR for these values. Enable logging for link up/down messages. The output also shows the utilization percentage that each system process has used in these periods. The Catalyst 2960 switch running the LAN base image has a smaller number of active processes than a stack of Catalyst 3750 switches.
The non-IPX RACLs apply to the Supervisor Engine 1a with PFC and the Supervisor Engine 2 with PFC2 only. The common misconception is that high CPU utilization indicates the depletion of resources on a device and the threat of a crash. 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. If you need to truncate the output sent to the file, first increase the sleep period (the sleep command in parenthesis).
High CPU Due to Excessive ICMP Redirects You can get ICMP dropped redirects when one VLAN (or any Layer 3 port) receives a packet where the source IP is on one This information is useful to identify any counts that are particularly high and incrementing rapidly. This can occur when the ACLs are being applied in an automated fashion (from a script). Contributed by Cisco Engineers Was this Document Helpful?
The show interface command gives basic information on the state of the interface and the traffic rate on the interface. 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. All other traffic that enters an ISATAP tunnel is hardware-switched. Review the syslog for reports of a failed power controller.
The c7500 example with multiple CPUs uses Cisco IOS Software Release 12.0(22)S3.