Monitoring WAN RTT Latency Using ManageEngine IT360

This section is common to all the editions of IT360 - Professional Edition, Enterprise Edition (Probes only) and MSP Edition (Probes only).

Here, you learn about the following with respect to WAN RTT monitor:

  1. About WAN RTT Monitor

  2. Configuring New Monitor

  3. Troubleshooting Latency issues

  4. Customizing Test Parameters and Threshold Template

  5. Business Views in WAN RTT Monitor

  6. Viewing WAN Monitor Alerts

  7. FAQs

1. About WAN RTT Monitor

The WAN monitoring feature in IT360 is an add-on feature and requires license to run. The WAN RTT monitor monitors the availability of all your WAN links, the Round Trip Time (RT) / Latency and the traffic details. Alerts are triggered when the set thresholds are violated, enabling the administrators to attend to the fault in no time.

IT360 uses Cisco's IPSLA agent to monitor the health and performance of the WAN links, and the prerequisite therefore is, that the device must be a Cisco router ( IOS version 12.3 or later) and it should have IPSLA agent enabled on it . Almost all the routers from Cisco are enabled with IPSLA agent and we support from IOS version 12.3 or later. The performance of the WAN link is measured by sending simulated traffic (packets of specified size) at a specified frequency. So the health of the WAN link / path is monitored round the clock . It helps the IT Engineer to proactively notice the problem. The Round Trip Time data is collected and persisted to measure the performance and also for reporting. Also, IT360 triggers alert when a Round Trip Time threshold is violated.

IT360 collects IPSLA traps for events triggered due to a connection loss or threshold violation for RT. When any such failure occurs, IT360 immediately triggers a Trace Route operation automatically to help the IT Engineer trace the fault to the exact hop. Further, the Trace Route report shows RT data for five different paths and 15 hops in a path. This enables you to troubleshoot and get to the root of the problem much quicker, resulting in very less downtime.

Besides this intelligent monitoring of the links across each hop, Netflow traffic reports also integrated in this new release. This enables you to identify any latency caused by the LAN traffic. You simply need to select all the WAN links / path to be monitored once and configure it.

2. Configuring New Monitor

2.1 Prerequisites

2.2. Creating a New Monitor

You just need to tell ManageEngine IT360 which paths you want to monitor i.e source and target. The source router (Cisco router enabled with IPSLA agent) should be discovered by the ManageEngine IT360.

Example: If you want to monitor latency and availability of branch office from your main office, you need to have a Cisco router enabled with IP SLA agent in your main office and this router should be discovered in the ManageEngine IT360.

Follow the below steps to create the monitor:

  1. Add Credential (Note: Enter valid SNMP read and SNMP write communities of the source router). You can also add the credential during the below step: 2.

  2. Add Device (Note: Enter the Name or IP address of the source device, select the newly added credential and then click Add Device)
If the device is already added in the ManageEngine IT360 search the device from the Search field at top right corner of the window. You will get the snapshot page of the device. Now click on the Click here to change link to change Passwords. Now you will get a pop-up with Use this Snmp Credential field at the top, from this select the newly added credential and the click on OK.
  1. Now, create the monitor by following steps:

    1. Click the Admin tab in the header pane.

    2. Click WAN RTT / VoIP link under Discovery.

    3. Click WAN RTT tab and then the Settings tab.

    4. Click Create New and enter the following details:

      1. Enter a Name for the router.

      2. Select the Source router from the list of routers discovered in ManageEngine IT360 and then select the relevant Source Interface.

      3. Specify the Destination IP Address (e.g. 203.199.21.11), enter a DisplayName and click Add to submit the details.

      4. Once you submit the details, you will see the summary of the monitor you are about to configure. Now click Apply to device to sumbit the details to the device. This will take few seconds to configure.

      5. Refresh the page after few seconds and go to all monitors page to see the new monitor. The data will be collected every 5 minutes , from the time you have configured.
Note: You can also create the monitor by navigating to: 'Networks -> WAN RTT Monitors -> Settings' and the by following the above step: iv.

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3. Troubleshooting Latency issues

Once you configure a monitor, ManageEngine IT360 will start collecting data at every 5 minutes. At each poll if the latency and availability violates the threshold limits, it will trigger an Alarm. After 5 minutes, if the latency of the monitor is violate the threshold limit an alarm will be listed in WAN RTT Monitors dashboard.

  1. Go to the WAN RTT Monitors dashboard by:

    1. Navigating to 'Networks -> WAN RTT Monitors -> Overview'. [OR]

    2. Clicking the Admin tab in the header pane, clicking WAN RTT / VoIP link under Add Monitor. Then accessing 'WAN RTT -> Overview'.

    Now, you can see the Least Performing Paths, Least Available Paths and Recent Alarms table. If there is any alert, it will be listed in Recent Alarms table. Click on the Severity image to get root cause.

  2. To know the root cause of the problem click on the Critical image of the alarm, this will give you the hop-by-hop round trip time details. From this you can identify the exact hop which has problem.

  3. To know the Availability, round trip time History (latency), SLA violation trend and path hop round trip time trends for any monitor, click All Monitors tab and click on the Path link for any monitor you wish. Then you can see the detailed statistics of that monitor for last 12 hours.

  4. To know the health of the monitor for last 12 hours hour by hour, go to 'Networks -> WAN RTT Monitors -> All Monitors'. There you can know the status of all monitors, i.e. good, critical and unknown for last 12 hours.
Note: If there is any threshold violation for a monitor at a particular hour then the status of the monitor for that hour will be shown as critical(red). Now move your cursor over the status image and click on the image you will get the reason for that critical severity and all hops latency details to troubleshoot the problem. If there is no threshold violation then severity is shown as good (green).
  1. If you want to see the detailed reports of each monitor, go to 'Reports -> Networks -> WAN RTT Monitors'. Here, you will find top latency reports top availability reports, SLA violation reports with export and schedule options.

4. Customizing Test Parameters and Threshold Template

ManageEngine IT360 uses set of Test Parameters (Payload,TOS,Timeout) for monitoring performance. The Test Parameters template comes with pre-populated default values. ManageEngine IT360 uses the these values to simulate traffic. Incase you would like to effect some changes to the values before adding new monitor, makethe changes as follows:

4.1. Customizing Test Parameters

  1. Go to the WAN RTT Monitors Settings wizard by:

    1. Navigating to 'Networks -> WAN RTT Monitors -> Settings'. [OR]

    2. Clicking the Admin tab in the header pane, clicking WAN RTT / VoIP link under Add Monitor. Then accessing 'WAN RTT -> Settings'.

  2. Click the Test Parameters tab at the left panel. Now, edit the following fields as required:

    1. Payload: The default value is 24 b. Specify an echo payload value in the range of 0 to 3000.

    2. Type of Service: Specify the Echo TOS in the range of 0 to 255, the default being 30.

    3. Frequency: Specify the interval in the range of 0 to 604800 msecs. The default interval is 60. The operation frequency is the frequency with which QoS metrics are collected by the IP SLA agent on your network to determine performance.

    4. Timeout: Specify the timeout in the range of 0 to 604800, the default being 60 secs. Make sure that the timeout interval is lesser than the configured operation frequency so that if the operation is not successful, that is, if there is no response from the device, or in the event of a delay, the request is timed out and the subsequent operation is launched at the configured frequency correctly.

    5. Enable Traceroute: Select Yes or No. This is tTo determine the latency of each hop from source to destination.

4.2. Customizing Threshold Template

You can define a Threshold Template before adding the new monitor so that you are alerted with the WAN RTT monitor voilates a specified value. The Threshold Template comes with pre-populated default values. ManageEngine IT360 uses the these values to generate alerts. Incase you would like to effect some changes to the values before adding new monitor, make the following changes:

  1. Go to the WAN RTT Monitors Settings wizard by:

    1. Navigating to 'Networks -> WAN RTT Monitors -> Settings'. [OR]

    2. Clicking the Admin tab in the header pane, clicking WAN RTT / VoIP link under Add Monitor. Then accessing 'WAN RTT -> Settings'.

  2. Click the Threshold Template tab at the left panel. Now, edit the following fields as required:


  1. Configure the Upper and Lower threshold Limits for Round Trip Time in msecs, the range being 0 to 60000 msecs.

  2. Select Notification Profile, which was already configured in ManageEngine IT360 to alert you, when the threshold exceeds the specifed limit.

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5. Business Views in WAN RTT Monitor

In WAN Monitor, business views help you to know the status of the device and WAN link between devices at a glance. Whenever a new WAN monitor is created, a business view (image shown below) of it also gets created automatically with the default background and device icons. However, later you can modify the background and device icons if required.

In the business view, mouse-over the Device icon or Name/IP and WAN link, to view its details. Clicking the device icon will open the snapshot page of the device. Clicking the WAN path opens the snapshot of the WAN path, if it is in Clear state, else it opens the Hop graph in order to trace the fault to the exact hop.

5.1 Accessing WAN RTT Monitor Business Views

  1. Navigate to 'Networks -> WAN RTT Monitors'.

  2. Click Business Views.

  3. Select the required business view from the drop down menu available on the top the business view displayed, to view it.

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6. Viewing WAN Monitor Alerts

  1. Navigate to 'Networks -> WAN Monitors'.

  2. Click Alerts to view the alerts raised by WAN Monitor.

All the alarms are listed with the Source name, Alarm Message, Status of the Device, Technician, Device category, date and time. Click the alarm message to view the alarm history.

 



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