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Product Documentation for Enterprise-Managed AP

Documentation Home for Self-Managed and Enterprise-Managed APs | Administrators Guide

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Appendix B. Troubleshooting

This section provides information about how to solve common problems you might encounter in the course of updating network configurations on networks served by multiple, clustered access points.

Wireless Distribution System (WDS) Problems and Solutions

If you are having trouble configuring a WDS link, be sure you have read the notes and cautions inConfiguring WDS Settings. These notes are reprinted here for your convenience. The most common problem Administrators encounter with WDS setups is forgetting to set both access points in the link to the same radio channel and IEEE 802.11 mode. That prerequisite, as well as others, is listed in the notes below.

Notes
  • The only security mode available on the WDS link is Static WEP, which is not particularly secure. Therefore, we recommend using WDS to bridge the Guest network only for this release. Do not use WDS to bridge access points on the Internal network unless you are not concerned about the security risk for data traffic on that network.
  • When using WDS, be sure to configure WDS settings on both access points participating in the WDS link.
  • You can have only one WDS link between any pair of access points. That is, a remote MAC address may appear only once on the WDS page for a particular access point.
  • Both access points participating in a WDS link must be on the same Radio channel and using the same IEEE 802.11 mode. (See Configuring Radio Settings for information on configuring the Radio mode and channel.)
  • Do not create loops with either WDS bridges or combinations of Wired (Ethernet) connections and WDS bridges. Spanning Tree Protocol (STP), which manages path redundancy and prevent unwanted loops, is not enabled for this release. Keep these rules in mind when working with WDS on this release of the Devicescape Enterprise-Managed AP:

    • Any two access points can be connected by only a single path; either a WDS bridge (wireless) or an Ethernet connection (wired), but not both.

    Do not create "backup" links.

    If you can trace more than one path between any pair of APs going through any combination of Ethernet or WDS links, you have a loop.

    You can only extend or bridge either the Internal or Guest network but not both.

Cluster Recovery

In cases where the access points in a cluster become out of sync or an access point cannot join or be removed from a cluster, the following methods for cluster recovery are recommended.

Reboot or Reset Access Point

These recovery methods are given in the order you should try them. In all but the last case (stop clustering), you only need to reset or reboot the particular access point whose configuration is out of sync with other cluster members or cannot remove/join cluster.

  • Physically reboot the access point by pressing the Power button on the device.
  • Reset the access point from its Administration UI. To do this, go to http://IPAddressOfAccessPoint, navigate to Advanced > Reset Configuration, and click the Reset button. (IP addresses for APs are on the Cluster > Access Points page for any cluster member.)
  • Physically reset the access point by pressing the Reset button on the device.
  • In some extreme cases, reboot or reset may not solve the problem. In these cases, follow the procedure described next in Stop Clustering and Reset Each Access Point in the Cluster to recover every access point on the subnet.

Stop Clustering and Reset Each Access Point in the Cluster

If the previous reboot or reset methods do not solve the problem, do the following to stop clustering and reset all APs.

  1. Stop clustering on each access point in the cluster.

    2. To do this, enter the Stop Clustering URL in the address bar of your Web browser as follows:

    http://IPAddressOfAccessPoint/stop_clustering.cgi

    Where IPAddres0sOfAccessPoint is the IP address of the access point you want to stop clustering. You can find the IP addresses for the cluster members on the Cluster > Access Points page for any of the clustered access points. We recommend making a note of all IP addresses at this point.

    The Stop Clustering page for this access point is displayed.

    Click the Stop Clustering button.

    Repeat this "stop clustering" step for every access point in the cluster.

    Table 1:
    Caution

    Do not proceed to the next step of resetting any access points until you have stopped clustering on all of them. Make sure that you first "Stop Clustering" on every access point on the subnet, and only then perform the next part of the process of resetting each one to the factory defaults.

  2. Reset each access point.

    3. To do this, go to the Administration Web pages of the access point you want to reset by entering its URL into the address bar of your Web browser:

    http://IPAddressOfAccessPoint/

    Where IPAddres0sOfAccessPoint is the IP address of the access point you want to reset.

    On the Administration UI left-hand tabs, click Advanced > Reset Configuration to bring up the Reset page.

    Click Reset to restore the factory defaults on the access point. (This will clear all of your previous settings, including updated passwords.)

    Repeat this "reset" step for every access point in the cluster.

    Table 2:
    Caution

    Do not proceed to the next step until you have stopped clustering on all of access points in the pre-existing cluster.

  3. Refresh the cluster view as follows.

    4. On the Administration Web pages for any one of the access points, click Cluster > Access Points to bring up the Access Points cluster management page and click the Refresh button.



    At this point you should see all previous cluster members displayed in the list.

    Before proceeding to the last step, verify that the cluster has reformed by making sure all are access points are listed.

  4. Review all configuration settings and make modifications as needed.

    5. Pay special attention to the security settings because after a reset, Access Points run without any security in place.

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