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  • 1.  Help in setting up multicast/IGMP/PIM

    Posted Jul 16, 2020 07:43 AM

    Hi, we have a 8212zl J9091A running K.15.18.0016 in which I am trying to configure multicast support on our video vlan (vlan 50).

     

    I have gone into the vlan interface and done 

    ip igmp auto

    and

    ip igmp querier 10

    I have also done

    ip pim-dense ip-addr any

     

    When I do a show ip igmp vlan 50 I get the following

     IGMP Service Protocol Info

  Total VLANs with IGMP enabled                : 1
  Current count of multicast groups joined     : 39

  IGMP Filter Unknown Multicast: Disabled
  IGMP Filter Unknown Multicast Status: Disabled

  VLAN ID : 50
  VLAN Name : Video
  IGMP version : 2
  Querier Address [this switch] : x.x.50.254
  Querier Port :
  Querier UpTime : 1d 7h 55m 38s
  Querier Expiration Time : 0h 0m 8s

    And a list of multicast addresses and the ports that they have been learnt on.  Strangely they appear to be mostly learnt on one particular port but there should be two ports that have multicast addresses on (each port leads to a different stack of daisy chained switches which have a large number of video presentation devices on them).

     

    When I do a 

    show ip pim

    I get this

     PIM Global Parameters

  PIM Status                   : Disabled
  State Refresh Interval (sec) : 60
  Join/Prune Interval (sec)    : 60
  SPT Threshold                : Enabled
  Traps                        : none

    Which I am not sure if that is correct as PIM has been enabled on the video vlan.

     

    Have I setup IGMP and PIM correctly?  We have a large number of video devices on two ports and as mentioned I am really only seeing entries from one of those ports and not the other port.

     

    The video devices are having trouble joining a multicast session (connect to video device over wireless from vlan 10 and then video device (vlan 50) should multicast out to other video devices on the same video vlan).

     

    On the downstream switches (Ubiquiti) I have done the following

    set igmp querier address x.x.50.254 
set igmp querier query-interval 10

    Which should point these downstream switches to the 8212zl for IGMP querier.

     

    Is there something I have missed or have got wrong?



  • 2.  RE: Help in setting up multicast/IGMP/PIM

    Posted Jul 16, 2020 10:23 AM

    PIM is responsible for routing the multicast streams over L3 networks. From your example i think you only require multicast in 1 vlan over multiple switches.

     

    Do you have any igmp snooping of multicast rate limits on ports that could cause traffic being dropped?

     

    Are the clients using igmp v2? there is also a v3, but i dont know of your switch supports it.



  • 3.  RE: Help in setting up multicast/IGMP/PIM

    Posted Jul 23, 2020 06:42 AM
    @Fabian Klaring wrote:

    PIM is responsible for routing the multicast streams over L3 networks. From your example i think you only require multicast in 1 vlan over multiple switches.

    PIM is currently only enabled on our video vlan (I removed it from other VLAN's)

    @Fabian Klaring wrote:

    Do you have any igmp snooping of multicast rate limits on ports that could cause traffic being dropped?

    Not that I am aware of or have seen.  What command can I use to check this?

    @Fabian Klaring wrote:

    Are the clients using igmp v2? there is also a v3, but i dont know of your switch supports it.

    I haven't been able to find out what version of IGMP the devices use.

    If I read this PDF correctly it would appear that the 8212zl J9091A does support IGMPv3 (it does say host joins only so not sure what that means).



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