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  1. Hi Suman,

    With dense mode flooding, the router will flood the original IP multicast packet that it receives on one interface on other PIM enabled interfaces.

    The hop-by-hop behavior of BSR is a bit similar but these packets have a TTL of 1. When the router receives these packets, it replicates the receiving packet and sends a new packet (with the same information) on its PIM enabled interfaces.

    Rene

  2. Hi Rene,

    I have one question. Can we implement both RP & BSR on the same router? Also, can we do the same thing with Cisco Auto-RP (RP & Mapping Agent on the same router)?

    Thank you,
    Minh

  3. Hello Minh,

    You can enable Auto-RP & BSR (and static RP) on the same router yes. Here’s a quick example:

    R1#show ip pim rp mapping
    PIM Group-to-RP Mappings
    
    Group(s) 224.0.0.0/4
      RP 2.2.2.2 (?), v2v1
        Info source: 2.2.2.2 (?), elected via Auto-RP
             Uptime: 00:00:23, expires: 00:02:32
      RP 4.4.4.4 (?), v2
        Info source: 4.4.4.4 (?), via bootstrap, priority 0, holdtime 150
             Uptime: 00:02:11, expires: 00:02:11
    

    R2 advertises itself as an RP with Auto-RP, R4 with BSR. R1 seems to prefer Auto-RP.

    Interesting to know is that with RP selection, the router prefers RPs that were learned through Auto-RP or BSR over static RPs!

    There’s not really a reason to use both Auto-RP and BSR but technically, you could use AutoRP to serve a set of multicast groups and BSR another set of multicast groups.

    Running the Auto RP and mapping agent on the same router is no problem, on small networks (and labs) I usually do this.

    Rene

  4. simply outstanding
    Thanks

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