I am having some problems when deploying images via Multicast using Windows Deployment Server. All imaging sessions are failing after a few minutes. While troubleshooting this issue we tried different images and they fail also - unicast works fine. We have also moved the server to the same switch as the clients and the imaging completes successfully.
Core: Cisco 4507re Sup 6E (All line cards are classic)
Access: Mix of 2950G, 3550, 3560
Switch stacks consist of mix of up to three 2950g and 3550/60 each stack connects to our single 4507re.
Clients and Deployment Server are in the same VLAN
All access Switches have default IGMP settings (enabled, v2)
Core 4507 has IP Multicast Routing
Int VLAN x
ip pim sparse-dense mode
Any ideas what I am doing wrong?