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Home > Success Center > VoIP & Network Quality Manager (VNQM) > VNQM Documentation > VNQM Evaluation Guide > Introduction > Understanding Quality of Service and IP SLAs

Understanding Quality of Service and IP SLAs

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Created by Caroline Juszczak, last modified by MindTouch on Jun 23, 2016

Views: 208 Votes: 0 Revisions: 3

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

Dynamic Host Configuration Protocol (DHCP) IP SLA operations measure the response time taken to discover a DHCP server, and then obtain a leased IP address from it.

DNS

Domain Name Server (DNS) IP SLA operations measure the difference in time from when a DNS request is sent and when the reply is received.

FTP

File Transfer Protocol (FTP) IP SLA operations measure the response time between a Cisco device and an FTP server to retrieve a file.

HTTP

Hypertext Transfer Protocol (HTTP) IP SLA operations measure distributed web services response times.

ICMP Echo

Internet Control Message Protocol (ICMP) Echo IP SLA operations measure round trip time between nodes on the network.

ICMP Path Echo

ICMP Echo IP SLA operations measure round trip time hop-by-hop between nodes on the network.

ICMP Path Jitter

ICMP Path Jitter IP SLA operations measure WAN quality by testing connection times hop-by-hop between two devices.

TCP Connect

Transmission Control Protocol (TCP) Connect IP SLA operations measure WAN quality by testing connection times between two devices using a specific port.

UDP Echo

User Datagram Protocol (UDP) Echo IP SLA operations measure round trip time between nodes on the network.

UDP Jitter

UDP Jitter IP SLA operations measure WAN quality by testing connection times between two devices using a specific port number.

VoIP UDP Jitter

Voice over Internet Protocol (VoIP) UDP Jitter IP SLA operations measure call path metrics on the VoIP network.

 
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