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Manual Chapter: Configuration Guide for the BIG-IP® Link Controller: Working with Listeners
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4

Working with Listeners


Introducing listeners

As traffic flows across your network, it is necessary to identify what traffic is relevant to your Link Controllers for load balancing and other operations. A listener is a specialized resource that is assigned a specific IP address. When traffic is sent to that IP address, the listener alerts the Link Controller, allowing it to forward the traffic to the appropriate resource.

The IP address that you assign to a listener depends on the number of VLANs (if any) on which the Link Controller is load balancing data.

When you work with listeners in the Link Controller Configuration utility, you can:

  • Set up the listener
  • Configure the listener to be used with VLANs

Setting up listeners

The Link Controller handles only DNS requests sent to the IP address specified for any listeners that you create. The IP address that you supply for a listener typically is the IP address you assigned to the Link Controller.

In general, you want to have the Link Controller able to answer DNS requests sent to any external VLANs or self IPs. Consequently, the number of externally-accessible VLANs and self IPs determines the number and configuration of the listeners you add to the Link Controller.

Note

For more information on VLANs and Listeners, see Configuring listeners with VLANs .

When you set up a listener, you can:

  • Configure the listener
  • Modify the listeners
  • Delete the listeners

To set up a listener

  1. On the Main tab in the navigation pane, expand Link Controller, and then click Listeners.
    The main listeners screen opens.
  2. Click the Create button.
    The new listener screen opens.
  3. In the Destination box, type the IP address on which the Link Controller will listen for network traffic.
  4. From the VLAN Traffic list, select a VLAN setting appropriate for this listener. For additional assistance with this setting, please see the online help.
  5. Click the Finished button to save the new listener.

Repeat this process for any additional listeners.

Modifying Listeners

After you create a listener, you can access its settings, changing them as needed. Common instances in which you want to modify a listener are when the IP address of the Link Controller changes, or you incorporate a new VLAN into your network infrastructure.

To modify a listener

  1. On the Main tab in the navigation pane, expand Link Controller, and then click Listeners.
    The main listeners screen opens.
  2. Click the name of the listener.
    The properties screen for that listener appears.
  3. Modify the settings for the listener.
  4. Click the Update button to save your changes to the listener.

Deleting listeners

In the event that a listener is no longer needed within the Link Controller, you can delete it. Common instances in which you would want to delete a listener are when you deprecate a VLAN, or if you move the Link Controller to a different subnet on the network.

To delete a listener

  1. On the Main tab in the navigation pane, expand Link Controller, and then click Listeners.
    The main listeners screen opens.
  2. Check the Select box that corresponds to the listener entry.
  3. Click the Delete button.
    A confirmation screen appears.
  4. Click the Delete button to delete the listener.

Configuring listeners with VLANs

In the event that the Link Controller is responsible for traffic on multiple VLANs, you must configure a listener for each VLAN. When you configure listeners for use in multiple-VLAN environments, you have the following configurations available to you:

  • All VLANs
  • Enabled for specific VLANs
  • Disabled for specific VLANs

Setting up a listener for all VLANs

If the Link Controller resides on a network segment that does not use VLANs, or if the IP address you assign as a listener is valid for all VLANs for which the Link Controller is responsible, you set the VLAN Traffic option to All VLANs.

To set up a listener for all available VLANs

  1. On the Main tab in the navigation pane, expand Link Controller, and then click Listeners.
    The main listeners screen opens.
  2. Click the Create button.
    The new listener screen opens.
  3. In the Destination box, type the IP address on which the Link Controller will listen for network traffic.
  4. From the VLAN Traffic list, select All VLANs.
  5. Click the Finished button to save your changes.

Enabling a listener for specific VLANs

If your installation of the Link Controller requires it to manage traffic for only some of the VLANs available on the network segment, you set the VLAN Traffic option to Enabled on.

To set up a listener for all available VLANs

  1. On the Main tab in the navigation pane, expand Link Controller, and then click Listeners.
    The main listeners screen opens.
  2. Click the Create button.
    The new listener screen opens.
  3. In the Destination box, type the IP address on which the Link Controller will listen for network traffic.
  4. From the VLAN Traffic list, select Enabled on.
    A new option, VLAN List, appears on the screen.
  5. Select the appropriate VLANs from the Available list and use the buttons provided to move them to the Selected list.
    The listener only alerts the Link Controller about traffic on the VLANs in the Selected list.
  6. Click the Finished button to save your changes.

Disabling a listener for specific VLANs

In instances where the Link Controller resides on a network segment with several VLANs, and you want to exclude some VLANs from a listener, you set the VLAN Traffic option to Disabled on.

To set up a listener for all available VLANs

  1. On the Main tab in the navigation pane, expand Link Controller, and then click Listeners.
    The main listeners screen opens.
  2. Click the Create button.
    The new listener screen opens.
  3. From the VLAN Traffic list, select Disabled on.
  4. Select the appropriate VLANs from the Available list and use the buttons provided to move them to the Selected list.
    The listener alerts the Link Controller about traffic on all VLANs except those listed in the Selected list.
  5. Click the Finished button to save your changes.



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