How to Measure Network Latency in Ethernet Switches?

Switch latency is measured from port-to-port on an Ethernet switch. It may be reported in a variety of ways, depending on the switching paradigm that the switch employs. It can be measured with different tools and methods in Ethernet switches, such as IEEE specification RFC2544, netperf, or Ping Pong. IEEE specification RFC2544 provides an industry-accepted method of measuring latency of store and forward devices. Netperf can test latency with request or response tests (TCP_RR and UDP_RR). While, Ping Pong is a method for measuring latency in a high-performance computing cluster, which measures the round-trip time of remote procedure calls (RPCs) sent through the message passing interface (MPI).