How to check bandwidth utilization on cisco router interface

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It only takes a minute to sign up. I'm using GroundWork a monitoring framework built upon Nagios to monitor some network devices via SNMP, but I'm stuck on a problem with bandwidth usage. Most routers, including the Cisco used here, can be queried via SNMP for network traffic information; however, they return this information in the form of a counter, meaning "how many bytes have gone in or out of a given interface since the router was turned on".

So, in order to get something meaningful out of this information, you need to, f. But how can I generate an alert when bandwidth usage exceeds a certain limit?

Nagios can send alerts only when a value is above a given threshold, not based on the difference between two distinct measures of the same value. I need a way to check if bandwidth usage is above a certain threshold, and generate a Nagios alert thus sending an e-mail if this happens; I can't rely only on the admin looking at performance data to see if something is wrong with network bandwidth. I did this with a cron script, stores current value in a temp file then next time uses it to calculate bandwidth utilization since last run.

Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Asked 10 years, 4 months ago. Active 9 years, 10 months ago. Viewed 12k times. Massimo Massimo Active Oldest Votes. Eddy Eddy 4 4 silver badges 8 8 bronze badges. Google found this: exchange. Found that one, but it doesn't work on a GroundWork setup. Mike17 Mike Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password.

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Email Required, but never shown. The Overflow Blog. Featured on Meta. Feedback on Q2 Community Roadmap. Related 6. Hot Network Questions. Question feed. Server Fault works best with JavaScript enabled.Hi, there was one time when our service provider told us that the reason why the network is slow and intermittent is because one of our servers is producing almost MB of traffic in a specific port in our switch.

We weren't able to capture or took a screenshot of it but I personally would like to learn if that is a command or how do I check this? That time, the issue was doing a continuous ping provides you with 5 replies and 5 RTO's, alternately.

Is there a Cisco command on that switch. Either the switch is a L3 switch or X L2 switch. Go to Solution. And of course, statistics are from point of view of interface.

View solution in original post. I tried show interface summary and it showed me the list of the interface together with some stats on the right side. Above is a sample of the output, I just tried to adjust the first lines just for analysis. So which part of this is the incoming and outgoing traffic? Buy or Renew. Find A Community. We're here for you! Turn on suggestions. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.

Showing results for. Search instead for. Did you mean:. Labels: Other Switching. Accepted Solutions. Milos Megis. Hi,try command "show.

Monitoring a Switch or Router with Nagios XI

I tried show interface. Thanks Jeff Jefferson Co. Latest Contents. Created by Santosh Sharma on PM. EEM script in this case can be challThe formula used is:. The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose.

Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk. In no event shall Author be liable for any damages wha2tsoever including, without limitation, damages for loss of use, data or profit arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.

Just to add to Seb's post, default measurement is across 5 minutes, but this can be changed. Minimum measurement period is usually 30 seconds. Buy or Renew. Find A Community. We're here for you! Turn on suggestions. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. Showing results for. Search instead for. Did you mean:. Labels: Other Switching.

I have this problem too. Seb Rupik.

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Disclaimer The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose.

Liability Disclaimer In no event shall Author be liable for any damages wha2tsoever including, without limitation, damages for loss of use, data or profit arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage. Posting Just to add to Seb's post, default measurement is across 5 minutes, but this can be changed.

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Latest Contents. Created by Santosh Sharma on PM. EEM script in this case can be chall Created by hiarteag on AM. Why show ip bgp table is not showing any best path with expr Created by upadhyayambition1 on PM. Created by ciscomoderator on AM.

how to check bandwidth utilization on cisco router interface

Create Please login to create content.Knowledge of the router forwarding capacity saves time as it eliminates the need for lengthy ASR packet drop troubleshoot. 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, make sure that you understand the potential impact of any command.

Refer to Cisco Technical Tips Conventions for more information on document conventions. ASR series router platform is a centralized router platform which means all the packets received by the router have to reach a centralized forwarding engine before it can be sent out.

The ESP module in the chassis determines the forwarding capacity of the router. Miscalculation of the Router capacity for the hardware configuration in use ESP and SIP combination can lead to network designs where the ASR series router fails to forward packets at line rate.

Three scenarios which can cause packet loss on an ASR series router are explained in this section. The SIP card supports the ingress packet classification and buffering in order to allow for oversubscription. Identify the ingress and egress interfaces for the traffic flow. If the router have a high bandwidth ingress link which receives packets at line rate and a low bandwidth egress link, it causes buffering at the ingress SIP.

Sustained incoming line rate traffic in these scenarios over a period of time causes the buffers to run out eventually and the router starts to drop packets. Note : SIP supports ingress packet classification which allows high priority packets to be still forwarded as long as it is not over subscribed and the non-critical packets gets dropped. The ingress classification and scheduling of packets on ASR routers is explained in the link. Classifying and Scheduling packets on ASR Run the show interface output on the egress interface to check if flow control is on and if the interface receives pause inputs from the next hop device.

Pause inputs indicates that the next hop device is congested. This ultimately leads to packet drops if the traffic rate is high and sustained over a period of time. Run the show interface summary command to check the total traffic that traverses the router. If the ESP is overloaded then it back-pressures the ingress SIP card to slow down and start to buffer which ultimately leads to packet loss if the high rate is stained over a longer period.

If the troubleshoot commands reveal that the router is not impacted by the scenarios explained, proceed to the ASR packet drop troubleshoot. The outputs are captured from an ASR router loaded with In this example, the total forwarding capacity maximum output capacity of the router is 5G and is determined by the ESP capacity.

The ingress over subscription drops indicate buffering in the ingress SIP and points that the forwarding engine or egress path congestion. The flow control status indicates whether the router processes the pause frames received or sends out pause frames in case of congestion. This command reveals the load on the ESP.We will discuss how to identify which hosts are moving the most traffic and go over how if desired to locate a host on your network and disable or limit its connection.

First, to determine which hosts are consuming the largest amount of bandwidth on a connection, we will want to use IP accounting. As we can see in this example, the traffic between Now we will track down Topics: CiscoNetworking.

Command to check the speed of internet on CISCO router which is connected through Fiber

We manage your printing and IT services so you can manage your business. Lewan Technology is a business technology and managed service provider serving Colorado, Wyoming, New Mexico and beyond.

Lewan Technology Blog. The latest insights, industry news, tips and topics from our team of experts. Router1 config-if ip accounting output-packets. Router1 show ip accounting. Router2 show arp include Router2 show mac address-table address Mac Address Table.

Total Mac Addresses for this criterion: 1. Device ID: Switch1. Entry address es :. IP address: Switch3 config-if shutdown. Switch3 config-if bandwidth Written by Dave Lincoln. Search Blog Posts in Google. About Us. More Links. Contact Us.Identifying Packets Punted from the Switch Hardware.

Obtaining Documentation and Submitting a Service Request. When the switch has completed the boot process, the CPU has two distinct functions. The first function is run the different processes under IOS to carry out the function for a switch operating in a network. The CPU is doing both of these functions simultaneously.

For instance the CPU is receiving lots of packets from the hardware because there's a broadcast storm on the network. This is just one example of a possible root cause for high CPU utilization. This debugging section will help you to identify other examples and describe how to take corrective action. Under normal operating conditions, on a non-stackable switch at a minimum, the CPU will have a certain baseline utilization. The number of members in the stack makes a difference on overall CPU utilization.

In the stacked switch, the CPU utilization is measured on the master switch only. There are multiple background IOS processes running on timers that execute multiple times a second. One of the reasons that different ranges and models within those ranges will differ in the baseline utilization is differences in design.

how to check bandwidth utilization on cisco router interface

Where the earlier models of the switches with little usage of microcontrollers, the later ones do utilize these more. As more tasks are being offloaded to those microcontrollers there is an increase in communication between the CPU and the microcontrollers.

How To Calculate Bandwidth Utilization Using SNMP

The output shows how busy the CPU has been in the past 5 seconds, the past 1 minute, and the past 5 minutes. The output also shows the utilization percentage that each system process has used in these periods. Two other important numbers are shown on the same output line: the average utilization for the last 1 minute 6 percent in this example and the average utilization for past 5 minutes 5 percent in this example. These values are typical for a nonstacked switch in a small and stable environment.

There can be hundreds of active system processes on the CPU at any time. This number can vary, based on the switch model, the Cisco IOS release, the feature set, and if applicable the number of switches in a switch stack.

For example, on a stack of Catalyst switches running the IP base image, there are typically active system processes. The Catalyst switch running the LAN base image has a smaller number of active processes than a stack of Catalyst switches. In general, the more features in the Cisco IOS image, the more system processes.This document describes common symptoms and causes of high CPU utilization on Cisco routers, and provides troubleshooting guidelines and solutions.

Configure Bandwidth Utilization on a Wireless Access Point

This list describes common symptoms of high CPU utilization. If you notice any of these symptoms, follow the troubleshooting steps in this document to alleviate the problem.

Check for a possible security issue. Commonly, high CPU utilization is caused by a security issue, such as a worm or virus operating in your network. This is especially likely to be the cause if there have not been recent changes to the network. Usually, a configuration change, such as adding additional lines to your access lists can mitigate the effects of this problem. Cisco Product Security Advisories and Notices contains information on detection of the most likely causes and specific workarounds.

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Cisco Product Security Advisories and Notices. Cisco Threat Control. Make sure all debugging commands in your router are turned off by issuing the undebug all or no debug all commands. For more information on the use of debugging commands, refer to Using Debug Commands. Are you able to issue show commands on the router?

how to check bandwidth utilization on cisco router interface

If yes, start collecting more information immediately, using these show commands. Is the router inaccessible? Can you reproduce this problem? If yes, power-cycle the router and, before reproducing the problem, configure the scheduler interval command.

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This schedules low priority processes to run every milliseconds, which provides time for you to run some commands, even if CPU usage is at percent. On Cisco and Cisco Series Routers, use the scheduler allocate command. Does the router show symptoms of high CPU utilization at brief and unpredictable intervals?

If yes, periodically collect the output of the show processes cpu command, which shows if the high CPU utilization is caused by interrupts or by a certain process. Use this UNIX script and, based on the first findings, modify the script to collect data needed for further investigation of the issue. Use the show processes cpu command to check if CPU utilization is high due to interrupts or processes. 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 5 or version 9.

Check which process is loading the CPU. Unusual activity related to a process results in an error message in the log. Therefore, the output of the show logging exec command should be checked first for any errors related to the process which consumes lots of CPU cycles.

Debugging can also be of great help in troubleshooting high CPU utilization in processes. Nevertheless, debugging should be carried out with extreme caution because it may raise the CPU utilization even more. These prerequisites should be met in order to make debugging safe and useful:. All logging destinations except buffer logging should be either disabled or their logging severity level should be lowered from 7 debugging to 6 informational or less, using the appropriate logging destination [ severity-level ] configuration command.

To see which logging destinations and corresponding levels are enabled, read the header lines of the show logging exec command. Logging buffer size should be increased in order to capture sufficient information. For more details, refer to the description of the logging buffered global configuration command. In order to be able to better read and understand debugs, the datetime and millisecond timestamps should be enabled.

For more details, refer to the description of the service timestamps global configuration command.


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