networklessons.com/network-management/cisco-ios-embedded-event-manager/ Cisco IOS IP SLAs constantly collects data on things like reaction times, latency, jitter and packet loss. This allows the network administrator not only to obtain basic information about network performance, but also to help the administrator verify QoS (service quality) levels and quickly identify the cause of a problem when performance levels decrease. When integrated into a Network Management System (NMS), visual alerts in case of threshold violation can be recorded in real time. Cisco IOS IP Services Level Agreements (SLAs) enables customers to deliver new critical IP applications and IP services using data, language and video over an IP network. Cisco has expanded traditional service level monitoring and expanded the IP infrastructure to raise awareness of IP application by measuring both the end-to-end layer and the IP layer. For some Cisco IOS IP-SLA processes, monitored network performance statistics are stored in the SNMP and CLI MBS. IP-SLA packages have options that can be configured at the application and IP level. These include the source IP address, destination IP address, service type, web URL, VPN, routing or transmission instance, and UDP or TCP port numbers. IP SLA stands for IP Service Level Agreement. This is a development of Cisco that allows to carry out network diagnostics. IP-SLA generates traffic between Cisco IOS devices that are connected to your network, and then analyzes traffic. The traffic generated is a simulation of network data and IP services, which captures network power metrics in real time.
VNQM is extremely functional (full list here) allowing you to monitor the metric VoIP QoS call such as latency, packet loss, Jitter and MOS; Correlation between call problems and WAN performance to facilitate troubleshooting at an advanced level; Search and filter all records of call details; and monitor WAN`s performance from one site to another. It can even automatically detect all Cisco IP SLA-enabled devices on your network, making the program fully available takes less than an hour.