When you set up a higher system to which clients are connected, specify the sender settings for multicast distribution. Also, when you set up the clients, specify the receiver settings. You specify the necessary settings on the Multicast Distribution page in each of the following dialog boxes:

At the sender:

• If the sender is JP1/Software Distribution Manager:
  Server Setup dialog box (server setup)
  
• If the sender is JP1/Software Distribution Client (relay system):
  Relay System Setup dialog box (basic settings for relay system)
  

At the receiver:

• If the receiver is JP1/Software Distribution Client (client):
  Client Setup dialog box
  
• If the receiver is JP1/Software Distribution Client (relay system):
  Detailed Information Setup dialog box (detailed setup for relay system)
  
• If the receiver is a relay manager of JP1/Software Distribution Manager:
  Detailed Information Setup dialog box (detailed setup for relay manager)
  

You must set the port numbers and multicast address. You must also set the packet size at the sender. The job is distributed to the multicast addresses specified at the sender. The receivers will receive the jobs distributed to the multicast addresses specified in their setup. For details about the settings, see the manual Setup Guide. Note that jobs for which unicast distribution has been specified will be distributed by the unicast method even though you specified multicast distribution during setup.

Notes on setup:

• There is no need to specify multicast distribution in setting up a higher system that is higher than the systems to which the clients are connected. For example, if the systems are connected in a central-manager, relay-system, client sequence, you do not need to specify any settings in the Multicast Distribution page when you set up the central manager.
• There is no setting for the sending port number in the Multicast Distribution page of the Relay System Setup dialog box of the JP1/Software Distribution ClientSubManager. If you are using multicast distribution from a JP1/Software Distribution SubManager, the port number you specified for receiving multicast distributions in the Detailed Information Setup dialog box of that machine is also used for sending.
• If there is a router that is not compatible with IP multicasting between the clients and the higher system to which the clients are connected, unicast distribution replaces the multicast distribution. In such a case, do not specify multicast distribution when you set up the higher system to which the clients are connected or the clients. If you specify multicast distribution during such a setup, a delay occurs when the switch is made to unicast distribution.

Multicast distribution can be specified independently for each job. To distribute a job using the multicast distribution method, open the Create Job dialog box, choose the Job Distribution Attributes page, and then select Multicast distribution under Distribution methods. For details about job creation, see 2.3 Executing remote installation in the manual Administrator's Guide Volume 1.