[Contents] [Prev] [Next] [Index] [Report an Error] [No Frames]


Configuring the Length of Time MAC Addresses Remain in SAE Cache

When a DHCP subscriber transitions from an authenticated IP address to an unauthenticated IP address or vice-versa, the SAE:

  1. Logs out the subscriber associated with the original IP address.
  2. Caches the subscriber profile in the in-memory cache, indexed by the DHCP subscriber's MAC address.
  3. Waits until the DHCP subscriber with the cached MAC address obtains its new IP address, and then logs in the subscriber and associates it with the new IP address.

The period during which the subscriber profile remains in the in-memory cache can last until the DHCP lease time for the original address. If something happens during this period—for example, the subscriber turns off the client computer—the subscriber profile remains in the SAE's in-memory cache forever. When a new IP address is assigned to the same DHCP client, problems can occur. To avoid such problems, entries in the in-memory cache are removed after a configurable amount of time. To configure this time period in SDX Configuration Editor:

  1. In the navigation pane, select a directory configuration object for the SAE that you want to configure.
  2. Select the Router tab.
  3. Fill in the field as described in Max Cache Expiration Time Field.

Max Cache Expiration Time Field

Use this field to configure the length of time that a subscriber profile remains in the SAE's in-memory cache.

MAC Cache Expiration Time


[Contents] [Prev] [Next] [Index] [Report an Error] [No Frames]