Multicasting VERY VERY SLOW!
(I have posted the below under "Enterprise Software" as well - sorry if this is bad practice but the below is relevant in both!)
We currently are having issues with multicasting. We have SCCM 2012 installed and are imaging computers. Our problem is that when multicasting it takes ages to open a session and to download the image WIM file. Also, when PXE booting the computers once we have about 10 computers imaging it takes ages to contact DHCP for an IP address. Also, it will struggle to obtain an IP address when the computer has booted into WinPE - by struggle I mean it sometimes does not get an IP address before it times out and bombs out!. If we keep retrying it will eventually work - imaging is still very slow.
When we open Task Manager whilst the computer is downloading the image the network utilisation does not get anywhere above 1.50%!!!
Our network consists of Netgear GS724TP and GSM7224 switches. We have a GSM7224 switch as our core switch in the server room. We also have a couple of HP Procurve switches in the server rack that are part of our high availability server virtualisation setup.
Our network is flat - no vLANs. All switch links are connected at 1GB. We have checked the switches to the best of our knowledge and they all have IGMP enabled and spanning tree is set to RSTP.
I hope the above makes sense - we can only think that the issue is down to some settings on the switches.
Thanks in advance!