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Forum Replies

  1. It all makes sense now…Multicast isnt that hard once you put it into small pieces. Thanks Rene!!!

  2. Hello Hussien

    Which router will be chosen depends on what is called the PIM Assert mechanism. You can find detailed information about this at the following lesson:

    https://networklessons.com/multicast/multicast-pim-assert-explained/

    ... Continue reading in our forum

  3. Hi Hussien,

    It’s the job of the DR (Designated Router) to forward the PIM join upstream.

    Rene

  4. Hi Hussein,

    In my example, R4 was only a receiver so it didn’t participate in PIM, which makes R2 or R3 the designated router. When you enable PIM on R4 and it is a DR, it will have two equal unicast routes to 1.1.1.1 so it has to make a choice.

    RPF does not use both routes but uses the PIM neighbor with the highest IP address to go upstream.

    Let’s look at an example. I’ll turn R4 into a PIM router by enabling it on the FastEthernet0/0 interface. I’ll also create a loopback that will have IGMP join on it so that R4 is the DR for the loopback segment:

    R4(config)
    ... Continue reading in our forum

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