Quality of Service and IP SLAs in SolarWinds VNQM

IP Service Level Agreements (IP SLAs) are a diagnostic method developed by Cisco® that generates and analyzes traffic between Cisco IOS devices on your network. By using SolarWinds VoIP and Network Quality Manager to implement IP SLA operations between your network devices, you can acquire real-time and historical statistics that give you accurate Quality of Service (QoS) measurements over designated network paths between a source device and a target device.

For a better understanding of individual quality of service and IP SLAs, it is necessary to understand the following concepts:

Source

A device that creates and inserts IP SLA packets into the network. The source is where all IP SLA operation tests are initiated.

Target

The ultimate destination of the packets created and sent by the source.

Operation

The type of test being performed on the network.

IP SLA Operations in VNQM

The following operations are supported by SolarWinds VoIP and Network Quality Manager.

  • DHCP: measures the response time taken to discover a DHCP server, and then obtain a leased IP address from it.
  • DNS: measures the difference in time from when a DNS request is sent and when the reply is received.
  • FTP: measures the response time between a Cisco device and an FTP server to retrieve a file.
  • HTTP: measures distributed web services response times.
  • ICMP Echo: measures round trip time between nodes on the network.
  • ICMP Path Echo: measures round trip time hop-by-hop between nodes on the network.
  • ICMP Path Jitter: measures WAN quality by testing connection times hop-by-hop between two devices.
  • TCP Connect: measures WAN quality by testing connection times between two devices using a specific port.
  • UDP Echo: measures round trip time between nodes on the network.
  • UDP Jitter: measures WAN quality by testing connection times between two devices using a specific port number.
  • VoIP UDP Jitter: measures call path metrics on the VoIP network.