Multicast Configuration

[lucak]

Hi

Im currently setting up 62 Samsung Hospitality TV's. In the moment i have one 48 port Cisco SG-200 and one Cisco Catalyst 3650. The Tv's get their signal over multicast, for this to work i need to setup igmp snooping, multicast groups and a igmp querier. The Problem i have is following, The CMND Server of the tv's are connected to the Cisco SG-200, on this one i have all functions except the igmp querier. I connected the SG-200 with the Cisco Catalyst configured those ports as trunk and set up the igmp querier on the catalyst. After this configuration i get a signal and i am able to watch tv for about 6-10 minutes. After that i get a blackscreen and notification saying: "No Signal". For me it looks like a problem with group joining / leaving, does somoene have an advice for me? Does ist even work like this or do i need a switch which has all funcionalities in one? Thank you very much for your help!

[M02@rt37]

Hello @lucak 

The SG-200 lacks the IGMP querier functionality, so it relies on the Catalyst 3650 to maintain multicast group memberships via IGMP queries. It's essential that IGMP snooping is enabled on both switches and that the Catalyst 3650 is correctly configured as the IGMP querier.

The trunk ports between the switches must be configured to allow all relevant VLANs carrying multicast traffic. If multicast group memberships are expiring because the IGMP reports are not properly processed or forwarded, this would cause the TVs to stop receiving the multicast stream, resulting in a black screen. You might need to replace the SG-200 with a switch that supports all necessary multicast features (IGMP snooping, querier, etc.).

Additionally, enabling debugging on the Catalyst with debug ip igmp snooping can help you to diagnose if IGMP reports are not being properly handled, leading to the multicast groups timing out and causing the TVs to lose signal...

[lucak]

Hi

Thank you very much for your fast response!

I will be able to test on friday, and will get back to you with more informations, or in best case with the solution!

Best regards,
Luca

[M02@rt37]

Thanks and you're welcome @lucak 

[Flavio Miranda]

@lucak 

 If it works and then stops we need to see logs in order to identity the root cause. Span the traffic from the port where one TV is connect, sent it to a PC with wireshark and let us see what the logs say.

[paul driver]

Hello

---

@lucak wrote:

n the moment i have one 48 port Cisco SG-200 and one Cisco Catalyst 3650. The Tv's get their signal over multicast, for this to work i need to setup igmp snooping, multicast groups and a igmp querier. The Problem i have is following, The CMND Server of the tv's are connected to the Cisco SG-200, on this one i have all functions except the igmp querier

---

you should not require the querier  on the SG-200 if the MC source resides on this switch, you need it on the catalyst switch, it sounds like igmp snooping is kiiling the MC traffic between the two switches.

Options

• disable igmp snooping (both switches)
• enable pim dense-mode on L3 interface vlan 1
• enable igmp snooping querier on the catalyst
• create static mroute port on the catalyst ( ip igmp snooping vlan x  mrouter < switchport>