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daveGPL's avatar
daveGPL
Aspirant
Jul 18, 2019
Solved

IGMP Snooping JGS524Ev2

Hi,   I bought 4 Netgear switches ( 3x JGS524Ev2 and 1x JGS524PE) and I am trying to setup IGMP to work properly. At the moment the settings look like this on all switches https://imgur.com/a/2e0Uz...
  • schumaku's avatar
    schumaku
    Jul 22, 2019
    All switches require the same IGMP snooping config - otherwise thier ports will be flooded (as you have seen).

    And yes, IGMP snooping can be enabled on one VLAN only - if there are multiple VLAN you have to define the VLAN.

    Multicast groups are a different thing, and vase on the addresses (on the same VLAN).
schumaku's avatar
schumaku
Guru - Experienced User
Jul 18, 2019

Firmware is current - version in place?

Tried a factory reset?

 

Gigabit Ethernet Smart Managed Plus Switches User Manual, p.50 says:

===

Select the Block Unknown MultiCast Address Enable radio button.
When this feature is enabled, multicast packets are forwarded only to the ports that
are in the multicast group learned from IGMP snooping. All unknown multicast
packets are dropped.
===

  • daveGPL's avatar
    daveGPL
    Aspirant
    Jul 22, 2019

    Hi,

     

    2.6.0.24 - all of them.

    I did reset to factory.

     

    Only to multicast group, that means VLAN1 ?

     

    I reconfigured only the main switch to use IGMP snooping and the rest of them in free run mode.

    So the multicast is tagged now as VLAN1 on the main so everytime I pull a multicast from the main switch anywhere on the network, all the swtches go mad in blinking. I guess I need to add only the ports that should have access to mutlicast to the same VLAN 1 as the mcast, and the IP phones in a separate VLAN, WiFi in a separate VLAN, etc. right ? But I do struggle there since I do not know if the other switches should have the same IGMP setup as the main switch.

     

    Regards,

    Cosmin

     

    • schumaku's avatar
      schumaku
      Guru - Experienced User
      Jul 22, 2019
      All switches require the same IGMP snooping config - otherwise thier ports will be flooded (as you have seen).

      And yes, IGMP snooping can be enabled on one VLAN only - if there are multiple VLAN you have to define the VLAN.

      Multicast groups are a different thing, and vase on the addresses (on the same VLAN).
      • daveGPL's avatar
        daveGPL
        Aspirant
        Jul 22, 2019

        Hi schumaku ,

         

        Thank you a lot for suggestions. All working as it should now. I did also set up port 24 for all switches to be the IGMP routing port and did block all the unknown mcast addresses. 

         

        Works like a charm.

         

        Thanks.

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