WAN Monitoring – Overview

WAN Monitoring – Use Case

Does my network need the WAN RTT Monitor?

Cisco IP SLA based WAN Round-Trip-Time monitoring best fits your network if you

• Face frequent performance issue over your MPLS-based network
• Want to monitor WAN link availability and performance across remote sites
• Are experiencing WAN circuit related issues
• Want to get hop-wise visibility on your WAN circuits
• Want to monitor the Quality-of-Service (QoS) across WAN links provided by your ISP

If your network has edge devices from Cisco with IOS, Cisco IP SLA is a cost effective monitoring solution to identify the efficiency of your WAN circuits.

What IOS versions or Cisco Devices support Cisco IP SLA?

Click here to see the chart on IP SLA supported Cisco IOS versions and for IP SLA supported Cisco devices list, click here. Visit this link for more information on Cisco IP SLA

How much Cisco IP SLA loads my device?

Cisco Press book was used as reference for this.

The following numbers bellow presents examples on different load conditions. The tests were performed on a Cisco 7200VXR/NPE-225 with IOS 12.2(8)T5.

IP SLA operations per second	500 probes	1000 probes	2000 probes
4	2%	2%	2%
20	5%	9%	14%
40	12%	29%	45%
60	39%	42%	70%

For a detailed impact report, please refer to our knowledge base.

Do I need to get a separate license for evaluating the WAN RTT monitor? (Evaluators/ Existing Customers)

The WAN RTT monitoring feature is enabled by default during the first 30 days of trial period. To continue using the WAN RTT monitoring feature, you will need to get a registered license key.

What are the steps to get WAN links monitored using OpManager?

Step 1: Add (/ discover) the router in your LAN making sure the SNMP read and write communities are configured properly for the router.

Step 2: Configure the Cisco router to send traps to OpManager. Alerts are shown based on the traps received in OpManager. To configure OpManager server as the SNMP server receiving traps for the routers, telnet the router and type the following command:

snmp-server host traps rtr

For instance, if the OpManager host IP Address is 192.168.18.128, and the community string is private, the command would be:

snmp-server host 192.168.18.128 traps private rtr

Step 3: Creating the WAN Monitor

• Go to the Maps tab (on from the list of Infrastructure views), click on > WAN Monitors > Settings
• Select the source router from the list of routers discovered in OpManager and then select the relevant interface of the source router
• Specify the destination IP Address either by using the 'Search' option to pick from the discovered routers, or directly enter the IP Address and click 'Add' to submit the details.
• You will see the summary of the monitor you are about to configure. Now click 'Apply to device' to submit the details to the device. This will take few seconds to configure.
• Refresh the page after few seconds to see the new monitor. The data will be collected every hour, from the time you have configured.

Need more clarification or assistance, reach us @ http://support.opmanager.com

WAN Monitoring – Overview

WAN Monitoring – Use Case