733Programming Operations GuideChapter 36Configuring Net Link ManagerNet Link Manager is a Business Communications Manager service that provides constant primarylink status monitoring. Net Link Manager is also where you select your WAN primary and backupinterfaces.This section contains information about enabling/disabling Net Link Manager, as well as how toselect WAN links:• “Enabling or Disabling Net Link Manager” on page 734• “Selecting a permanent WAN link as the primary WAN connection” on page 734• “Selecting a dial-up link as the primary WAN connection” on page 736When Net Link Manager detects a primary WAN link failure, Net Link Manager automaticallyestablishes a backup WAN connection, if one is configured. Net Link Manager monitors the WANprimary link by performing multiple tests. When a predetermined number of tests fails, Net LinkManager establishes the backup connection.The backup connection uses a V.90 modem or one or more ISDN B-channels. When the backupWAN connection is active, Net Link Manager continues to monitor the status of the primary WANlink connection. When the primary WAN link connection is determined to be available again, NetLink Manager re-establishes the primary WAN link and disconnects/disables the backupconnection.Warning: If dial-up connection is used as the primary WAN connection, no backup linkis available.Note: Net Link Manager manages the default route in Business CommunicationsManager. If the primary link fails, Net Link Manager removes the default route from thePrimary link and adds it to the backup link. This happens during the switch over fromprimary to backup link. The default route returns to the primary link after the connectionto the primary WAN link is re-established.
