I have a network which has many devices sending data to 126.96.36.199 on a VLAN which spans multiple switches. Each device (aprox 12 of them) is sending reporting data at roughly 500-600 kbps. Each port on the VLAN, whether the receiver sends a join or not, is getting flooded with roughly 6mbps of multicast traffic.
IGMP snooping is enabled on all the switches and the local VLAN.
pim sparse-mode is configred on the mrouter/default gateway.
If I do a
show ip igmp snooping groups on the switch, there is no entry in the snooping table.
I know 188.8.131.52 - 184.108.40.206 fall within the link-local reserved IP Multicast range meaning a router will not forward packets within this range. These ranges are also used for routing protocol chatter. eg) EIGRP, OSPF, HSRP...etc
I have two questions:
1) I think the answer is YES - for 220.127.116.11 18.104.22.168...does IGMPv2 ignore this range for snooping and does the switch just forward this to all ports?
2) Is there a way to force IGMP to snoop this multicast traffic and only send it to the ports which request it with an IGMP join?
I have a feeling this is one of those instances where the application/programmers need to design their devices and application to respect scalable non-consumer networks. Thus they should be using a multicast address in the 22.214.171.124/8 range.