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  • 1.  PIM SPARSE-DENSE MODE Quesion on SRX 650

    Posted 11-13-2017 13:15

    Hi everyone,

     

     

    Let say we have SPARSE-DENSE MODE set up.

    SRX1 is RP 1.1.1.1 for group 236.1.1.1 and 236.2.2.2.2

    SRX2 is configured to act as PIM DENSE Router for group 238.1.1.1

    Suppose SRX2 receives multicast stream for 237.1.1.1 from directly attached source,  this stream is not defined as DENSE Group and RP is not configured to accept registration for such stream either.

    What will happen next?

    Will SRX2 send register message carrying 237.1.1.1 to RP? If yes, how will SRX2 to react upon receiving REGISTER STOP from RP as this group is not defined on RP?  Will SRX2 start using DENSE Mode for 237.1.1.1?

     

    Thanks,



  • 2.  RE: PIM SPARSE-DENSE MODE Quesion on SRX 650
    Best Answer

    Posted 11-13-2017 22:01

    Pl find answers as follows.

     

    Suppose SRX2 receives multicast stream for 237.1.1.1 from directly attached source,  this stream is not defined as DENSE Group and RP is not configured to accept registration for such stream either.

    What will happen next?

     

    Ans - As per my understanding, static groups are just for traffic shaping, other minimum configuration does not require, explicit group configuration. Hence, if an unknown multicast is received on the multicast enabled interfaces, it process it as per the configuration enabled on the received interfaces. if the dense mode is enabled, it will be processed without requiring any RP.

     

    Will SRX2 send register message carrying 237.1.1.1 to RP? -

    Depends on which mode is enabled. If the you have enabled spare mode on the receiving interface, then yes.

     

    If yes, how will SRX2 to react upon receiving REGISTER STOP from RP as this group is not defined on RP?  Will SRX2 start using DENSE Mode for 237.1.1.1? -

    -As i said, group config are not mandatory statements to be configured to have PIM working. PIM will process the traffic either dense mode or sparese mode based on the enabled mode on interfaces.