I have some problems with IGMP snooping feature on the SG300 switch.
I want to filter multicast dinamycally with IGMP snooping.
To configure our switch I use the web page:
- In Multicast I first enable:
- Thzn I enable IGMP snooping
- Then I enable IGMP Snooping on my VLAN
During my tests I stream a video (UDP multicast). This stream is present on all the ports of my VLAN with IGMP snooping normally configured. Also, I can't see any entry in the IGMP/MLD IP Multicast Group Table where I should normally see my multicast address.
Any idea why it's not working ? Problem with SG300 (in last fw version) ?
The setup you describe won't work. This is because the switch in L2 mode has only one ip address. The querier will send IGMP queries with this address in all vlans. Operating System (e.g Linux) in vlans beside management vlan will receive the queries but won't respond to them because source ip in a query (generated by switch) is in a different ip subnet.
I see 3 solutions:
1) Install a router on the network to act as a qurier or
2) Change the mode of operation of the switch to L3 and assign proper ip addresses in all vlans (switch will send out queries with source ip address that is in the same subnet as other devices connected to it) or
3) One no so good solution is to force an invalid ip address in Linux on the ethernet device (from management vlan) so it responds to those queries
"In general, addresses from 18.104.22.168 to 22.214.171.124 are reserved and used by various protocols (standard or proprietary, such as Hot Standby Router Protocol (HSRP)). Cisco recommends that you not use these for GDA in a multicast network. CGMP and IGMP snooping do not work with this reserved address range."
You should have at least one IGMP querier on you lan. This is usually done by a router. If you only have switches or want a backup querier enable it in IGMP snooping configuration page.
For the second requirement to see only wanted traffic you will probably be interested in filtering unwanted multicast traffic. See switch web interface, menu Multicast > Unregistered Multicast. Make sure to test this feature because it also filters traffic in 224.0.0.X (except 126.96.36.199) so it can break your current applications. If you use anything in that range you will have to manually managed it.
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