Network Visibility can collect metrics for these object types:
- Network links between tiers, or between tiers and load balancers/TCP endpoints
- Connections between nodes, or between nodes and load balancers/TCP endpoints
Troubleshooting a performance issue in Network Visibility often involves drilling down from an application issue (flow) to a network issue (link) to the root cause (connection). See Workflows and Example Use Cases.
App Agents collect metrics for application flows between tiers, as shown in the Application Flow Map. This diagram shows the calls, transactions, and messages for application x between tier 1 and tier 2.
Network Agents collect metrics for network links, which you can view in the Network Dashboard. A network link is the set of all traffic between two tiers, or between a tier and an intermediate load balancer, or TCP endpoint. If an application flow transports traffic through a load balancer, Network Visibility creates a link on each side and calculates metrics for each link. This diagram shows the network traffic for application x sent and received by the two tiers through a load balancer.
Individual nodes send and receive traffic over connections. In Network Visibility, a connection is a set of all traffic with the same source IP address, destination IP address, destination port, and protocol. This diagram shows the individual connections used by the four nodes to send and receive traffic for application x through the load balancer.