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Multicast session flooding vlan

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FOG Problems
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  • P
    pac1085
    last edited by Feb 18, 2012, 5:52 PM

    We have a FOG server which resides on our server VLAN (vlan 2). We image clients across VLANs (for example, vlan 4). Recently, during multicast sessions, our network guys claimed it caused an outage due to a flood of traffic on the VLAN the server resides on. I do not have a whole lot of details from them yet, but they claimed it was flooding the interfaces of all devices on that VLAN, much like a broadcast.

    I will attach a capture of the multicast.log file showing the udp-sender parameters that were run on Monday.

    in the mean time, has anyone had any issues like this?

    We use FOG at several of our sites and as the local IT team enjoy using it very much. They are threatening to make us use WDS if we can’t find a root cause on this.

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    • F
      falko Moderator
      last edited by Feb 18, 2012, 6:52 PM

      sounds like the network guys, do not have the correct config on the switches, I can multicast accross vlans just fine

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      • P
        pac1085
        last edited by Feb 19, 2012, 3:27 AM

        the multicast works fine across VLAN’s. However it seems like it ‘broadcasts’ to the VLAN that the server is located on at the same time.

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        • J
          jamster54
          last edited by Feb 19, 2012, 11:37 PM

          what switches are you using?

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          • R
            Raff
            last edited by Feb 20, 2012, 9:44 AM

            If you are using cisco switches see [url]http://www.fogproject.org/wiki/index.php?title=Cisco_Multi_Cast[/url] for sample config

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            • D
              DJCminuz
              last edited by Feb 21, 2012, 9:28 PM

              I would say have the networking guys check out which pim mode is set. Cisco, the best IMO is sparse mode because it is a pull type multicast rather then push to everything on the vlan and have it prunned off. I have sparse mode set on mine, and havent had any problems

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              • D
                DJCminuz
                last edited by Feb 21, 2012, 9:29 PM

                I would say have the networking guys check out which pim mode is set. Cisco, the best IMO is sparse mode because it is a pull type multicast rather then push to everything on the vlan and have it prunned off. I have sparse mode set on mine, and havent had any problems

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                • W
                  Warren
                  last edited by Feb 23, 2012, 6:14 PM

                  Any attemp to multicast on network switches that do not have IGMP Snooping will cause network flooding of broadcast packages. IGMP (Internet Group Management Protocol) settings should be found on your switches.

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