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Forum Discussion
Multicast not forwarded to mrouter port
I have several GS728TPPv1, v2, and GS110TPv2, v3 switches that are part of a network that has a Cisco 9300 Layer 3 switch at its core. The 9300 is also the IGMP Snooping Querier for all vlans. ...
Thanks schumaku
It sure seems like that. Everything I've read though seems to say that unknown multicast should be sent to the mrouter port (per multicast design). That's the way the Cisco's are behaving.
I've put in a ticket with the encoder manufacturer to see if they can explain why they have the option to Join IGMP Group - their literature basically says "for enhanced switch compatibility" 😀
I have the exact same problem on two different Netgear switches both with the latest firmware. I noticed this several years ago on the GS108T switch. I just received a GS308T and it is doing the exact same thing as you report. It auto detects the mrouter port correctly as it is seeing incoming queries from an external switch. However the Netgear is not forwarding any streams from my streaming device toward the mrouter UNLESS another receiver on the Netgear is asking for the same stream.
I did contact Netgear technical support a few years ago any they could not help me. I don't even think they fully understood the problem. This is a very technical issue that requires in depth knowledge of IGMP.
I really just wanted a low cost and small switch to carry around to help troubleshoot IGMP issues. Anyone know of one that actually works according to the standard?
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