C1300 Bridge Multicast Filtering not enabled

[richard-white]

I purchased a C1300 for my home office lab explicitly so I could manage the multicast traffic effectively, and avoid flooding my LAN.

It clams to have IGMP Querier/Snooping and filtering, but when I come to enable this, it says that Bridge Multicast Filtering is disabled, which I obviously need.  I cannot find a way to enable this - the user guide indicates it's in the UI, but i cannot find it.

Currently all multicast traffic is flooding every port on the switch.   I've now moved all devices that are using multicast to a separate VLAN, in a separate subnet, but that VLAN is still flooding every device with all multicasts.

How can I enable this, and ensure that only subscribed devices receive the multicast traffic they have requested

Model is C1300-24P-4G running latest firmware

[Jens Albrecht]

Hi @richard-white,

first of all, the settings for multicast properties are only available in Advanced View mode.

Then under "Multicast" --> "Properties" you can find the parameter "Bridge Multicast Filtering Status" which needs to be enabled.

HTH!

[richard-white]

Thanks for the reply - I had not noticed that there is an advanced selection which makes this available (although I had managed to enable this via the CLI).

Everything now seems correctly configured, but I'm still seeing all the multicast traffic (captured in wireshark) on every device connected to ports in this VLAN, even when not subscribed.   I'm only seeing the traffic on the VLAN in question (2), which has devices multicasting from 10.10.2.101 and 10.10.2.105, on to 239.0.0.101 and 239.0.0.105 respectively, but when I capture on a device connected to this VLAN on 10.10.2.103 (and it most definitely is not subscribed), I see all the traffic.

The status of the querier is showing not operational, too.

Any thoughts on why this would be.

[Jens Albrecht]

Your screenshots show the querier IP address as 255.255.255.255 which indicates that the SVI does not have an IP address assigned.

The querier must have an IP address assigned to the interface Vlan 2 in order to work.

You also need to check whether the querier is explicitly enabled per Vlan. It is not sufficient to just globally enable the querier but it must be also enabled for Vlan 2.

As you appear to be using the command line as well, the quickest way is to make sure that the following commands are listed under your SVI:

interface Vlan 2
  ip address <ip> <mask>  
  ip igmp snooping querier

HTH!