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S12700 Series Agile Switches Typical Configuration Examples

This document provides examples for configuring features in typical usage scenarios.
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Example for Configuring Local 1:N Port Mirroring (Observing Ports Are Configured in a Group)

Example for Configuring Local 1:N Port Mirroring (Observing Ports Are Configured in a Group)

1:N Mirroring Overview

In 1:N mirroring, packets on one mirrored port are copied to N observing ports so that the packets can be copied to different monitoring devices for analysis and processing.

In 1:N mirroring, multiple observing ports need to be configured and connected to different monitoring devices. There are two modes for configuring observing ports: configure a single observing port and configure an observing port group. Observing port group is often used in 1:N mirroring to simplify the configuration and save observing port indexes. This is because an observing port group occupies only one observing port index regardless of how many ports are configured in the group.

Configuration Notes

  • You must dedicate observing ports for mirroring use and do not configure other services on them to prevent mirrored traffic and other service traffic from affecting each other. Do not configure any member port of an Eth-Trunk as an observing port. If you must do so, ensure that the bandwidth of service traffic on this port and the bandwidth occupied by the mirrored traffic do not exceed the bandwidth limit of the port.

  • If the mirroring function is deployed on many ports of a device, a great deal of internal forwarding bandwidth will be occupied, which affects the forwarding of other services. Additionally, if the mirrored port bandwidth is higher than the observing port bandwidth, for example, 1000 Mbit/s on a mirrored port and 100 Mbit/s on an observing port, the observing port will fail to forward all mirrored packets in a timely manner because of insufficient bandwidth, leading to packet loss.

  • On all Huawei S series modular switch models, Eth-Trunks can be configured as observing ports.

  • Both physical interfaces and Eth-Trunks can be configured as mirrored ports. If an Eth-Trunk is configured as a mirrored port, its member ports cannot be configured as observing ports.

  • In 1:N mirroring, if you batch configure either inbound or outbound packets to be copied from a mirrored port to multiple observing ports, the packets cannot be copied to other observing ports.
  • This configuration example applies to all switches running all versions.

Networking Requirements

As shown in Figure 17-9, the R&D department of a company accesses the Internet through the Switch, and monitoring devices Server1, Server2, and Server3 are directly connected to the Switch.

Internet access traffic of the R&D department needs to be mirrored to different servers for different monitoring and analysis purposes.

Figure 17-9  Local port mirroring networking

Configuration Roadmap

The configuration roadmap is as follows:
  1. Configure GE1/0/2 through GE1/0/4 of the Switch as local observing ports to forward mirrored packets to different servers.
  2. Configure GE1/0/1 of the Switch as a mirrored port to copy the traffic passing through it to different local observing ports.


  1. Configure observing ports.

    # Configure GE1/0/2 through GE1/0/4 of the Switch as local observing ports in a batch.

    <HUAWEI> system-view
    [HUAWEI] sysname Switch
    [Switch] observe-port 1 interface-range gigabitethernet 1/0/2 to gigabitethernet 1/0/4     //Configure GE1/0/2 through GE1/0/4 as local observing ports in a batch and share the same observing port 1.

  2. Configure a mirrored port.

    # Configure GE1/0/1 of the Switch as a mirrored port to copy the packets received by the mirrored port to local observing ports.

    [Switch] interface gigabitethernet 1/0/1
    [Switch-GigabitEthernet1/0/1] port-mirroring to observe-port 1 inbound     //Mirror incoming traffic on GE1/0/1 to observing port 1.
    [Switch-GigabitEthernet1/0/1] return

  3. Verify the configuration.

    # Check the observing port configuration.

    <Switch> display observe-port
      Index          : 1
      Untag-packet   : No
      Interface-range: GigabitEthernet1/0/2 to GigabitEthernet1/0/4

    # Check the mirrored port configuration.

    <Switch> display port-mirroring
      Observe-port 1 : GigabitEthernet1/0/2 to GigabitEthernet1/0/4
           Mirror-port               Direction  Observe-port
      1    GigabitEthernet1/0/1      Inbound    Observe-port 1

Configuration Files

  • Configuration file of the Switch

    sysname Switch
    observe-port 1 interface-range GigabitEthernet1/0/2 to GigabitEthernet1/0/4
    interface GigabitEthernet1/0/1
     port-mirroring to observe-port 1 inbound
Updated: 2019-05-16

Document ID: EDOC1000069466

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