IP SLA monitoring 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 VNQM 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. IP SLAs provide baseline information about network performance, and help you identify the root cause of a problem if performance levels drop. IP SLAs are especially useful for WANs that connect multiple locations but need to be monitored from one central location.
The following diagram illustrates how IP SLA monitoring works.
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.
When you define an operation, the Source device continuously sends tests to the target, running the test every five minutes by default. The Cisco device stores the operation results in its memory, and SolarWinds VNQM polls the results through SNMP and CLI parsing. IP SLAs use active traffic-monitoring to continuously monitor traffic across the network. SolarWinds VNQM supports the following operations:
- 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.
This getting started guide shows you how to add a VoIP UDP Jitter operation to SolarWinds VNQM. For all other operations, see the SolarWinds VNQM Administrator Guide.