The Netgear does not seem to be sending multicast towards the mrouter port, and my understanding is that it should be. If I connect the encoder to a Cisco switch that is in turn connected to the core, traffic is forwarded to the mrouter port, and the receiver attached to the Netgear switch sees the stream.

I can get to a point where the Netgear switches recognize that the Cisco Switch is the IGMP Querier for the vlan (it shows the Cisco's IP address) - but still, the multicast traffic is not sent to the mrouter port.

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The Netgear (728TPv2) does seem to identify the mrouter port. If the encoder and receiver are both on the Netgear, traffic is forwarded to the Cisco (on the mrouter port). The switch also passes mDNS traffic between two ports, and to/from elsewhere on the network - so I don't think "Block unknown multicast" is in play. The v2 switch doesn't even seem to have that option - but the v1 did. On a TP110 I have, "block unknown multicast" would block the mDNS as well.

Anyway - without a receiver connected to the Netgear, the multicast goes nowhere. It does not go towards the Cisco / mrouter port. We are using 239.200.1.20 for our multicast address. I noticed that mDNS was still being transmitted. If i change the encoder to output to a 224.0.0.x address - it gets transmitted (flooded actually) which I believe is correct for that address range.

I guess the main question I have is whether the Netgear is supposed to be sending all multicast traffic towards the mrouter port - or does it only send IGMP join requests/reports and queries? It doesn't seem to be sending all unless something on the switch is also receiving that stream. On an earlier firmware version for this switch, the command "ip igmp snooping unknown-multicast action router-port" would send those packets to the mrouter port without flooding other ports on the switch. I couldn't find an option in the GUI for that - and the command isn't even present in newer versions.

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.

This is a dynamic feature that when configured on a switch it considers itself

to be a mrouter, acting as a proxy instead of a router. It will send out general

queries and when the other switches sees this query, they will learn that as a

mrouter port.

To configure a port as a multicast router port, use the ip igmp snooping mrouter command in the service-instance configuration mode. To remove the configuration, use the no form of this command.

If you have a L3 switch that supports multicast routing (PIM), there is no need for an explicit mrouter port. The SVI ("interface vlan"), as soon as enabled for multicast routing, will process IGMP Join messages by end systems, and will also send out IGMP queries.

That being said, it is still a good idea to turn on IGMP snooping for the given VLANs, to ensure proper forwarding of multicast at the swichting layer - at the same time, IGMP snooping will detect the "internal switchport towards the SVI" as the mrouter port.

IGMP Querier (for IGMP Snooping) is an auxiliary construct for (V)LANs without multicast routers, to allow all igmp snooping switches to learn a (dummy) mrouter port and keep their multicast forwarding tables tidy (and not have to resort to flooding).

Long explanation: when a switch (or the Layer2 part of an L3 switch) sees an IGMP querier, or an IGMP router, or a PIM router, it actually sees an mrouter. Therefore the port connected to it is defined as mrouter port (on a downstream switch it will be also the upstream toward another switch plugged to the mrouter, btw). By definition an mrouter port will always get all the multicast streams inside an L2 LAN, this is mandatory.

2) there's no provision to clearly identify which kind of mrouter is behind an mrouter port (as an IGMP querier only obviously won't advertise anyone of the mutlicast sources it sees). So it works this way anyway, whereas in this case that's a bit annoying, but this is by design in the RFCs.

Yes, if the EX3400 (or any switch doing IGMP snooping) sees an mrouter on one interface (that is, sending IGMP membership queries, PIM packets, or whatever) inside a vlan, it will sends it all the multicast flows present in the vlan, as this is by design (of RFC, not of Juniper).

The IGMP querier is a relatively new feature on Layer 2 switches. When a network/VLAN does not have a router that can take on the multicast router role and provide the mrouter discovery on the switches, you can turn on the IGMP querier feature. The feature allows the Layer 2 switch to proxy for a multicast router and send out periodic IGMP queries in that network. This action causes the switch to consider itself an mrouter port. The remaining switches in the network simply define their respective mrouter ports as the interface on which they received this IGMP query.

In a network where IP multicast routing is configured, the IP multicast router acts as the IGMP querier. In situations when no mrouter port exists in the bridge domain (because the multicast traffic does not need to be routed), but local multicast sources exist, you must configure an internal querier to implement IGMP snooping. The internal querier solicits membership reports from hosts in the bridge domain so that IGMP snooping can build constrained multicast forwarding tables for the multicast traffic within the bridge domain.

The local IGMP snooping process responds to the internal querier's general queries. In particular, the IGMPv3 proxy (if enabled) generates a current-state report and forwards it to all mrouters. For IGMPv2 or when the IGMPv3 proxy is disabled, IGMP snooping generates current-state reports for static group state only.

To statically configure a port to receive query packets, use the mrouter command in IGMP snooping profile configuration mode. To remove the configuration, use the no form of this command.

Router guard is a security feature that prevents malicious users from making a host port into an mrouter port. (This undesirable behavior is known as spoofing.) When a port is protected with the router-guard command, it cannot be dynamically discovered as an mrouter. When router guard is on a port, IGMP snooping filters protocol packets sent to the port and discards any that are multicast router control packets.

When you configure a static group or source group on a port, IGMP snooping adds the port as an outgoing port to the corresponding forwarding entry and sends an IGMPv2 join or IGMPv3 report to all mrouter ports. IGMP snooping continues to send the membership report in response to general queries for as long as the static group remains configured on the port. 0852c4b9a8

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