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S12700 V200R011C10 Configuration Guide - Network Management and Monitoring

This document provides the configurations of network management and monitoring features supported by the product, including SNMP, RMON and RMON2, LLDP, Performance Management, iPCA, NQA, Service Diagnosis, Mirroring, Packet Capture, Traffic Distribution, NetStream, sFlow, and TWAMP Light.
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Port Mirroring

Port Mirroring

In port mirroring, packets passing through mirrored ports are copied and then sent to specified observing ports for analysis and monitoring. There are two types of port mirroring: local port mirroring and remote port mirroring. The type used depends on the location of monitoring devices.

Local Port Mirroring

Local port mirroring enables a switch to copy packets passing through mirrored ports and send these packets to ports, known as local observing ports, that are directly connected to monitoring devices.

Figure 8-2 shows that a local observing port forwards the packets copied from the mirrored port to the directly connected monitoring device.

Figure 8-2  Local port mirroring

Remote Port Mirroring

In remote port mirroring, observing ports, also known as remote observing ports, are connected to monitoring devices through a Layer 2 network.

Layer 2 Remote Port Mirroring

In Layer 2 remote port mirroring, remote observing ports are connected to monitoring devices through a Layer 2 network. Figure 8-3 shows the process of mirrored packet forwarding in Layer 2 remote port mirroring.

  1. The mirrored port copies original packets and sends them to the remote observing port.
  2. The remote observing port receives the mirrored packets from the mirrored port, adds another VLAN tag (VLAN 20) to the packets tagged with VLAN 10, and then forwards the packets to the intermediate Layer 2 network. Note that in this step, you can directly specify VLAN 20 while configuring the remote observing port, without the need to add the port to VLAN 20.
  3. SwitchC receives the mirrored packets sent from the remote observing port and then forwards the packets to the monitoring device.

    To enable SwitchB, SwitchC, and the monitoring device to communicate at Layer 2, you need to add the ports connecting the intermediate Layer 2 device (SwitchC) to the remote observing port and monitoring device to VLAN 20.

Figure 8-3  Layer 2 remote port mirroring
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Updated: 2019-10-21

Document ID: EDOC1000178113

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