Dell EMC Configuration Guide for the S4048T–ON System 9.14.2.4

Port Monitoring

Port monitoring (also referred to as mirroring ) allows you to monitor ingress and/or egress traffic on specified ports. The mirrored traffic can be sent to a port to which a network analyzer is connected to inspect or troubleshoot the traffic.

Mirroring is used for monitoring Ingress or Egress or both Ingress and Egress traffic on a specific port(s). This mirrored traffic can be sent to a port where a network sniffer can connect and monitor the traffic.

Dell EMC Networking OS supports the following mirroring techniques:

• Port-Mirroring — Port Monitoring is a method of monitoring network traffic that forwards a copy of each incoming and outgoing packet from one port of a network router to another port where the packet can be studied.
• Remote Port Monitoring (RPM) — Remote Port Monitoring allows the user to monitor traffic running across a remote device in the same network. Here the mirror traffic is carried over the L2 network, so that probe devices in the network can analyze it. It is an extension to the normal Port Monitoring feature. This feature is generally referred as RPM, where mirror traffic is carried over L2 network.
• Encapsulated Remote-Port Monitoring (ERPM) — ERPM is a feature to encapsulate mirrored packet using GRE with IP delivery so that it can be sent across a routed network.