Configuring local mirroring (Menu)

If mirroring has already been enabled on the switch, the Menu screens appear different from the one shown in this section.

Procedure
  1. From the Main Menu, select 1. Switch Configuration ... , and then select 3. Network Monitoring Port.
    The default network mirroring configuration screen
  2. In the Actions menu, press [E] (for Edit.)
  3. If mirroring is currently disabled for session 1 (the default), enable it by pressing the Space bar (or [Y]) to select Yes.
  4. Press the down arrow key to display a screen similar to How to select a local exit port, and move the cursor to the Monitoring Port parameter.
    How to select a local exit port
  5. Use the Space bar to select the port to use for sending mirrored traffic to a locally connected traffic analyzer or IDS.
  6. (The selected interface must be a single port. It cannot be a trunk or mesh.) In this example, port 5 is selected as the local exit port.
  7. Highlight the Monitor field and use the Space bar to select the interfaces to mirror:
  8. Ports: Use for mirroring ports, static trunks, or the mesh.
  9. VLAN: Use for mirroring a VLAN.
  10. Do one of the following:
    1. If you are mirroring ports, static trunks, or the mesh, go to
      11

      .

    2. If you are mirroring a VLAN:
      1. Press [Tab] or the down arrow key to move to the VLAN field.
      2. Use the Space bar to select the VLAN you want to mirror.

      3. Go to 14.

  11. Use the down arrow key to move the cursor to the Action column for the individual port interfaces and position the cursor at a port, trunk, or mesh you want to mirror.
  12. Press the Space bar to select Monitor for the ports, trunks, mesh, or any combination of these that you want mirrored.
  13. Use the down arrow key to move from one interface to the next in the Action column. (If the mesh or any trunks are configured, they appear at the end of the port listing.)
  14. When you finish selecting interfaces to mirror, press [Enter], then press [S] (for Save ) to save your changes and exit from the screen.
  15. Return to the Main Menu.

You can also use the CLI to configure a mirroring session for a destination device connected to an exit port on either:

  • The same switch as the source interface (local mirroring.)

  • A different switch (remote mirroring.) The remote switch must be an switch offering the full mirroring capabilities described in this chapter.

After you configure a mirroring session with traffic-selection criteria and a destination, the switch immediately starts to mirror traffic to each destination device connected to an exit port.

In a remote mirroring session that uses IPv4 encapsulation, if the exit switch is not already configured as the destination for the session, its performance may be adversely affected by the stream of mirrored traffic.

For this reason, Switch strongly recommends that you configure the exit switch for a remote mirroring session before configuring the source switch for the same session.