What are the prerequisites for adding an IP SLA (VoIP/WAN RTT/Video) monitor?

Prerequisites for adding an IP SLA (WAN RTT/ VoIP/Video) monitor

WAN RTT: The WAN RTT Monitor in OpManager works according to the ICMP echo operation. It monitors the end to end response time (Rount Trip Time) between a Cisco router/switch and an IPv4/IPv6 destination device(s) and also helps in troubleshooting connectivity issues in a network. 

VoIP: OpManager performs the UDP jitter operation to proactively monitor the VoIP quality between Cisco devices. The UDP jitter operation simulates continuous VoIP traffic to consistently monitor the voice quality scores between the source and the destination devices. 

Video: Unlike VoIP and WAN RTT, video operation in IP SLA is quite different. Here, the traffic is one way, where the responder (destination device) collects and verifies the incoming packets and waits for a request from the source to send the data back.


  1. The source should be an IP SLA enabled Cisco device, added/discovered in OpManager
  2. SNMP credentials with 'Read' and 'Write' permissions should be properly configured and associated to the source device. OpManager supports SNMP v1/v2c for configuration and SNMP v1/v2c/v3 for data collection of an IP SLA monitor.
  3. The source and the destination devices should be reachable from the OpManager Server. (Check the reachability of the device by using the 'ping' function)
  4. Destination device: 
    • a. WAN RTT: The destination device(s) can be any networking device with a valid IP address that supports RFC 862 or Echo protocols or an IP SLA Responder enabled Cisco device.
    • b. VoIP: The destination device(s) should always be a Cisco device with IP SLA Responder enabled.
    • c. Video: The destination device(s) should be a Cisco device that is capable of generating platform-assisted video traffic and reflection.

To enable IP SLA Responder

If your destination device is a Cisco Router, it is mandatory to enable the IP SLA Responder. Open a CLI session on the destination router and follow the steps below to enable the EXEC mode.

  1. To enable privileged EXEC mode:
    Router › enable 
  2. To enable the global configuration mode:
    Router#configure terminal
  3. Router#configure terminal
    Router(config)#ip sla responder
    Router(config)#ip sla monitor responder>

For more information on Cisco IP SLA, visit https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipsla/configuration/15-mt/sla-15-mt-book.html

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