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S2700, S3700, S5700, S6700, S7700, and S9700 Series Switches Typical Configuration Examples

This document provides examples for configuring features in typical usage scenarios.
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Example for Configuring Local Port Mirroring (N:1 Mirroring)

Example for Configuring Local Port Mirroring (N:1 Mirroring)

N:1 Mirroring Overview

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

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. On the following Huawei S series fixed switch models, Eth-Trunks can be configured as observing ports in V200R005 and later versions: S5700HI, S5710EI, S5710HI, S5720EI, S5720HI, S5730HI, S6700EI, S6720EI, S6720HI, and S6720S-EI.

  • 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.

  • This configuration example applies to all switches running all versions.

Networking Requirements

As shown in Figure 17-11, three departments (science and technology department 1, science and technology department 2, and administrative department) of a company access the Internet through the Switch, and the monitoring device Server is directly connected to the Switch.

Internet access traffic of the three departments needs to be monitored through the Server.

Figure 17-11  Local port mirroring networking

Configuration Roadmap

The configuration roadmap is as follows:
  1. Configure GE1/0/4 of the Switch as a local observing port to forward mirrored packets to the Server.
  2. Configure GE1/0/1 through GE1/0/3 of the Switch as mirrored ports to copy Internet access traffic of the three departments to the local observing port.

Procedure

  1. Configure an observing port.

    # Configure GE1/0/4 of the Switch as a local observing port.

    <HUAWEI> system-view
    [HUAWEI] sysname Switch
    [Switch] observe-port 1 interface gigabitethernet 1/0/4     //Configure GE1/0/4 as a local observing port 1.
    

  2. Configure mirrored ports.

    # Configure GE1/0/1 through GE1/0/3 of the Switch as mirrored ports to copy the packets received by the mirrored ports to the local observing port.

    [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] quit
    [Switch] interface gigabitethernet 1/0/2
    [Switch-GigabitEthernet1/0/2] port-mirroring to observe-port 1 inbound     //Mirror incoming traffic on GE1/0/2 to observing port 1.
    [Switch-GigabitEthernet1/0/2] quit
    [Switch] interface gigabitethernet 1/0/3
    [Switch-GigabitEthernet1/0/3] port-mirroring to observe-port 1 inbound     //Mirror incoming traffic on GE1/0/3 to observing port 1.
    [Switch-GigabitEthernet1/0/3] return

  3. Verify the configuration.

    # Check the observing port configuration.

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

    # Check the mirrored port configuration.

    <Switch> display port-mirroring
      ----------------------------------------------------------------------
      Observe-port 1 : GigabitEthernet1/0/4
      ----------------------------------------------------------------------
      Port-mirror:
      ----------------------------------------------------------------------
           Mirror-port               Direction  Observe-port
      ----------------------------------------------------------------------
      1    GigabitEthernet1/0/1      Inbound    Observe-port 1
      2    GigabitEthernet1/0/2      Inbound    Observe-port 1
      3    GigabitEthernet1/0/3      Inbound    Observe-port 1
      ----------------------------------------------------------------------  
    

Configuration Files

  • Configuration file of the Switch

    #
    sysname Switch
    #
    observe-port 1 interface GigabitEthernet1/0/4
    #
    interface GigabitEthernet1/0/1
     port-mirroring to observe-port 1 inbound
    #
    interface GigabitEthernet1/0/2
     port-mirroring to observe-port 1 inbound
    #
    interface GigabitEthernet1/0/3
     port-mirroring to observe-port 1 inbound
    #
    return
    
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Updated: 2019-04-20

Document ID: EDOC1000069520

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