I work in a public school (600 students) as a Technician. 120 computers. Cisco 1700 Router (which we do not have access to), 1 Gb Internet link. Windows 2003 Server, 120 XP workstations. 3com 4400 switches and the 'master' switch is Vlaned. Port 1 is connected to the Cisco Router. When multicasting with Ghost Server which is installed on a separate 'Ghost' computer that contains all of our images for the various classrooms, Port 1 on the 'master' 3Com switch 'floods' and consequently blocks Internet access. Broadcast storm, IGMP, and spanning tree are enabled on the switches.
We can unicast but it is too slow to do a full suite of computers in the short times we have access to them. We can multicast at dawn or evening when all curriculum users are not there but I need help with what else to check out why the multicasting is 'flooding' port 1 to the router. The computers being reimaged are connected to the 3com switches close by i.e. they do not go through other banks of switches. All ideas welcome. I have waded through all of the EE ghost questions but have not found a solution yet. Many thanks.