Note the following points about using multicast distribution:

• If you specify the same multicast address in multiple relay managers/systems in a network, the job will be distributed by multicast distribution from all those multiple relay managers/systems to the clients connected to them. To avoid this sort of duplication of job distribution, specify a unique multicast address for each relay manager/system.
• If the multicast addresses of clients and their higher systems are different, jobs are distributed by unicast distribution even if you specify multicast distribution. For example, if a relay system goes down and jobs are to be distributed temporarily via another relay system that has a different multicast address, they will be distributed by unicast distribution.
• Multicast distribution is not available for jobs for which split distribution is specified.
• If a client has not yet started during multicast distribution, or if a client PC has not been turned on, the job is distributed by multicast distribution after the client has been started or after the power to the client PC has been turned on.
• If a client is not resident during multicast distribution but polling at system startup is specified, jobs are distributed by means of multicast distribution when the system is started. However, jobs are distributed by unicast distribution if you choose the Execute Job Backlog icon for when the client is not resident.
• If a client is unable to receive an entire job sent by multicast distribution, the remaining part of the job is sent automatically by unicast distribution.
• Do not select both Multicast distribution and Boot the client at the job destination (Client Control page) when you create jobs. If you attempt to distribute jobs for which both are specified, additional time will be required to distribute those jobs to client PCs that are not turned on. Use the following procedure to start client PCs that are not on so that jobs can be distributed by multicast distribution:
  
  1. Specify Boot the client at the job destination for jobs such as Get system information from client. When such jobs are executed, power will be turned on at the client PCs, if necessary.
  2. Execute the jobs for which you specified Multicast distribution.