Show memory usage cisco nexus

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Cisco - Router/Switch - Health Check Commands

Note I have run on v5. One package has one 4Gb module. Notice the 8Gb sticker on module in the red block. During a scheduled change window, make sure to save you configuration. If you only have one SUP, it would be best to power the box down completely before yanking out the only SUP to upgrade the memory. The picture shows where the module should be inserted. Before inserting the 4Gb module pull of the sticker and place it on the front of the SUP.

Connect the console to the SUP that has been upgraded and confirm all services are functioning as required.

Confirm the memory upgrade reflects on the upgraded SUP:. Then do to upgrade the last SUP by repeating the above process, with the following ending result. Just another Network Engineer. View all posts by Ruhann. Good explanation.

show memory usage cisco nexus

Thank you for the information! I have developed 2 vdc and the default one with 5.

show memory usage cisco nexus

Although the traffic that passes through is about Gb and the load is small! I performed this the other night, the first standby sup upgraded and rebooted, when I upgraded the second originally active sup and reinserted the active sup rebooted. I know of a bug that sounds similar to your problem on v 5. I cant remember that bug-id for it, but it should not be to hard to find. Alternatively 5.In newer versions due to new feature addition the memory usage will likely be high when compared to older version.

The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared default configuration.

If your network is live, ensure that you understand the potential impact of any command. Below are some sample outputs from my lab minimally configured N demonstrates baseline memory utilization on the platform. The above CLI reports proportional memory utilization per process takes into account memory pages shared between processes. By adding the proportional memory usage of all processes, we can get a representation of userspace processes memory usage.

These reside in temporary file systems not backed by persistent storage and are accounted for by linux as ShmFS. The Cached counter is a sum of ShmFS and cached files.

As a proportion of baseline utilization, temporary file systems are the largest memory consumer. This is expected behavior and common among all NX-OS based platforms. For NX-OS running 5. Therefore, the increased memory usage is likely a factor of new features in each release and a larger base footprint for the OS. Always refer Release notes to understand the system requirement for every software. The hardware and software requirement espescially the memory vary while upgrading to a newer version of code.

Release notes. Skip to content Skip to footer. Available Languages. Download Options. Updated: June 26, Contents Introduction. Introduction This document helps you understand average memory utilization on Nexus device.The Nexus platform is a Linux-based system with a preemptive scheduler that allows fair access to CPU resources for all processes. Supervisor Engine 1 has a dual-core processor, Supervisor Engine 2 has a quad-core processor, and Supervisor Engine 2E has two quad-core processors.

Therefore, the history option may report CPU spikes that do not necessarily indicate a problem. Default hardware rate limiters HWRL and default control plane policing CoPP are enabled to help protect the supervisor inband interface on Nexus platforms. Use this command in order to display the CPU usage for the last 60 seconds, 60 minutes, and 72 hours.

This command, which was added in Release 6. In NX-OS, all the threads share the memory allocated by any other thread, so it is not possible to display per thread information. This command is equivalent to the top command in Linux, which provides an ongoing look at processor activity in real time. This is sample output:. This is an example script that captures intermittent high CPU usage. The values used as well as the commands issued can be modified depending on the requirements:. Note : It is necessary to define 'exit-val.

A value for exit-val ensures that the script does not run in an endless loop. There is no process vs. A quick way to determine the cause of high CPU usage is to use the show system internal processes cpu command. Depending upon the processes and issues that are causing high CPU usage, you may need to capture specific commands. These sections describe methods that might be helpful.

Use this command in order to show the memory allocation for a process; use the 'in Grand' option to monitor the Grand total memory.

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A memory leak can cause a process to misbehave, which can result in high CPU usage. Use debug commands wisely on a production switch to avoid service disruption. Use the debug logfile command whenever possible to direct the output to a specified file and to avoid locking up the session to fill up the syslog. Use the debug-filter command when possible in order to minimize the output on a production system.

show memory usage cisco nexus

For example, a packet loss causes unidirectional link detection UDLD empty echo:. Aggregate traffic from multiple modules can still burden the CPU heavily.Came across this issue where application performance was poor and pings were hitting ms.

This gives you a clear indication of a problem. Unfortunately, there is no cpu history command to go back in time. Next check for non-zero CPU processes. So I had 2 issues going-on. CP processing issue was related to duplicate configuration command in policy-map.

In my example I had pptp inspection configured in 3 different policies and applied to 3 interfaces including global. So if you see this process high one place to check is you policy-map config. So next step is troubleshooting Datapath issues. First thing to check is you connection stats with show conn all command. There will be a lot of data but the goal is to find connections with the most bytes.

Network Insight for Cisco Nexus

If they are the same it may indicate a routing loop which is driving your CPU. To confirm validate destination network or do packet capture. Once confirmed modify command to reflect the interface in question. Here is an example output. Copy output and paste it in Exceldo T ext to Columns and sort by most bytes. I got a big list and started with highest talkers first.

At this point, you need to decide how to fix it. Ideally, you need to go to the source and remove the invalid configuration. You will have destinations and ports which should be enough to pinpoint misconfigured application.

If it is not possible then for invalid routes you can do Null0 for specific host or subnet similar to below. After that, you need to clear connection to invalid IP and check again to make sure it did not reappear.

Currently you have JavaScript disabled. In order to post comments, please make sure JavaScript and Cookies are enabled, and reload the page. Click here for instructions on how to enable JavaScript in your browser. Start with sh cpu usage. Post Navigation C. Leave a reply: Cancel Reply Your email address will not be published. Disclaimer Privacy.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Network Engineering Stack Exchange is a question and answer site for network engineers.

It only takes a minute to sign up. I've seen another Version I checked this in our local lab with default configurations on the switch. I saw that Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Asked 3 years ago. Active 3 years ago. Viewed 8k times. I'm trying to see how much RAM is being used by each switch. This is what I am seeing from the switch when I run the show version command. Eoin Irwin Eoin Irwin 23 1 1 silver badge 3 3 bronze badges.

It works on IOS I did, here's the response. Please, never use an image to show text. Active Oldest Votes. Network Datagram. Network 1, 5 5 silver badges 15 15 bronze badges. Doesn't Processor only show the CPU usage? Network Mar 22 '17 at As I want to scrape this information with Python to get an idea of how much RAM is being used per switch.

Those two number combined give you total memory size. But does the second number not mean the amount of memory that is currently being used? SO this is how it works and I guess nothing to worry about.

Abby Rj Abby Rj 13 2 2 bronze badges.

show memory usage cisco nexus

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Nexus 7000 High CPU Usage Troubleshooting Guide

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