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Spirent TestCenter: How to change IGMP/MLD message rate when you are using RFC3918 multicast wizard to test multiple ports devices like switch?

Answer
  • When you are using RFC3918 to test multicast capability of multiple ports devices like a 16 or 24 ports switch, you may find the test are always fail, even you only test with 2 or 4 multicast groups.
    • The problem is not the device under test (DUT) cannot process 2 or 4 multicast groups, it's because the DUT cannot handle the IGMP/MLD message received from multiple ports that Spirent TestCenter emulates IGMP/MLD clients and send out IGMP/MLD messages at same time. If this is the case, you can try lower down the IGMP/MLD message send out rate of STC. How to to that? Please see attached document.
  • ​Another example: 
    • ​Currently running 14K groups with 35 IGMP clients, all clients not seen as member in the DUT for last group.
    • The join rate may be too high for DUT to handle as mentioned in previously or
    • The join delay expired before all joins were sent. (This is a configuration on the Spirent Application)
 

Product : Spirent TestCenter,Switching,IGMP/MLD,RFC 3918,Multicast