catalyst 3560 switch
5 vlans with 4 ports each, 1 vlan with 8 ports, 1 vlan with 16 ports
system mtu jumbo set to 9014
igmnp snooping on or off not making a difference
no routing between vlans
the 5 4port vlans consist of one multicast generator and two receivers plus a spare port
the other two vlans are just normal traffic with nominal bandwidth
when the multicast packet size is limited in software to less than 9000 bytes everything works fine but the performance is bad due to system overhead on the generators as i am actually wanting to send 1440000 bytes for each packet and am having to break up into 160+ packets. taking approx 24msec to transmit all packets
if i change to packet size to 64,000 bytes (less than 64K max) no errors are reported but very very few of the packets are received although the traffic is apparent on the network. this must be a problem in the switch with handling the fragmented packets ( each frag 64000/MTU). this was not an issue on our previous dlink switch (no longer available). note my total transmit time drops to 16msec but is usless as the data is not properly received by the receivers.
what am i missing in the configuration?
I have this problem too.