Notable Replies

  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.


  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,

  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
      RP (?), v2v1
        Info source: (?), elected via Auto-RP
             Uptime: 00:00:23, expires: 00:02:32
      RP (?), v2
        Info source: (?), 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.


  4. simply outstanding

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