Multicast Question....

[infinidim]

I am seeing a lot of these messages on the Lan side of my Vodafone router -

11/04/2024 16:54:06  Ignoring MLD pkt on non snooping enabled bridge interface lan

11/04/2024 16:51:58  Ignoring MLD pkt on non snooping enabled bridge interface lan

11/04/2024 16:49:53  Ignoring MLD pkt on non snooping enabled bridge interface lan

The log entry "Ignoring MLD pkt on non snooping enabled bridge interface lan" on your Vodafone router refers to the router ignoring Multicast Listener Discovery (MLD) packets on a bridge interface that does not have snooping enabled.

Multicast Listener Discovery (MLD) is used by IPv6 routers to discover multicast listeners on a directly attached link. Snooping is a feature that allows the router to listen to these packets and manage multicast traffic more efficiently. When snooping is not enabled, the router ignores these packets, which is what your log entry is indicating.

How do you enable MLD snooping on a Vodafone Power Hub?

Thanks in advance

Infinidim

[Gemma · Accepted solution]

Hi @infinidim - thanks for explaining what's happening in detail. Please contact our Home Broadband Support team on 191 free from a Vodafone mobile or 08080 034 515 from another phone. 

[infinidim]

@Gemma chatted with Broadband support yesterday and they said that they had sorted this out. They asked me to cycle the power on the Vodafone Power and it would fix the issue. Well today we still have the same situation -

11/06/2024 15:54:35 Ignoring MLD pkt on non snooping enabled bridge interface lan lan
11/06/2024 15:52:27 Ignoring MLD pkt on non snooping enabled bridge interface lan lan
11/06/2024 15:50:30 Ignoring MLD pkt on non snooping enabled bridge interface lan lan
11/06/2024 15:48:22 Ignoring MLD pkt on non snooping enabled bridge interface lan lan
11/06/2024 15:46:15 Ignoring MLD pkt on non snooping enabled bridge interface lan lan

Not impressed.

Any other ideas to get it resolved.

Regards

Infinidim (John)

[Mark]

As our Home Broadband team are best placed ot assist with this @infinidim, you'd need to reach out ot them again and explain the issue's re-occurred.

[infinidim]

Please do that.

I have been chatting with Vodafone support and the have said that the Power Hub does not support MLD - therefore does not support RFC2710 or RFC 3810. 

I find the strange as the Vodafone Core network support IPV4 and IPV6 multicast groups I have been told. MLD is an essential component of IPv6 networks, ensuring that multicast traffic is delivered efficiently and only to devices that need it. 

Your thoughts

Infinidim (John)

[Mark]

As I advised in my earlier message @infinidim you will need to continue to discuss this with our Home Broadband team as they are best placed to discuss this. 

[CrimsonLiar]

I guess the question becomes, what issue is the lack of MLD support actually causing?  Yes, this is broadcast data, but it's rarely more than about 5Mbps across a connection capable of 1000Mbps.

*My unmanaged L2 switch doesn't snoop on multicast data, and when anyone is watching live broadcasts that multicast data is there, but I've never been aware of it ever affecting anything!

[infinidim]

@CrimsonLiar This not only effects the efficiency of the local network but also effects the efficiency of the core network, in particularly the access nodes of the core network.. Basically the Power Hub and maybe other Vodafone routers don't support the IPV6 MLD packets on the local lan ports as far as I can tell.

[infinidim]

I know that when we were designing, in a previous job, a network that had to support about 25 million end points we made sure that access / metro node efficiency was optimised. 

I have seen in the Vodafone access and core networks drops. I am node sure which Cisco / Juniper routes they use these days  but they could be getting to a limit with multicast traffic.

Infinidim

[CrimsonLiar]

Efficiency vs convenience!

You should probably run WireShark on your local network.  As it's broadcast data, if it's there you'll see it.  When no one is connected to a stream, it'll be almost nothing, and even when you've a few competing streams, it'll be very little.

*Vodafone is not the only broadband provider with equipment that doesn't snoop on multicast streams!