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Forum Replies

  1. Great content so far!
    Please update the topology pic, there the IP adress in for R2 and R3 must be changed.
    Is pim snooping ever used as it doesn’t seem to be well covered from Cisco’s documentation, too.

    • Why is R2 the DR as R3 has higher IP?
    • Why should one filter traffic to the DR as it break the ability to send join/register messages to the RP and to register sources or receivers? Or does this join/regeister forwarding by an DR only apply when the RP is in another broadcast domain?
      Best regards

  2. Hello Alexander

    Looking at the topology pic, I’m not sure where the error is. The network is shared between the three routers on interface Ge0/1 with IP addresses of .1, .2 and .3. Please elaborate on what should be corrected.

    As for your other questions:

    Actually, R1 is the DR as is indicated in the PIM debug messages on both R1 and R2. Although you are correct that the higher IP should be chosen as

    ... Continue reading in our forum

  3. Hi. Thanks for your answers, didn’t see the hard-coded RP in the first moment.
    Explanaition for PIM Snooping and DR traffic is sufficient.

    Regarding the topology pic, the IP adresses for R2 and for R3 are wrong/ should be changed.
    R2 has configured 192.168.123. 2 and topology pic shows 192.168.123. 3
    R3 has configured 192.168.123. 3 and topology pic shows 192.168.123. 2

    Best regards

  4. dears
    from cisco document:
    By default, routers that have PIM snooping enabled will flood multicast traffic to the designated router
    (DR). This method of operation can send unnecessary multicast packets to the designated router. The
    network must carry the unnecessary traffic, and the designated router must process and drop the
    unnecessary traffic.
    To reduce the traffic sent over the network to the designated router, disable designated-router flooding.
    With designated-router flooding disabled, PIM snooping only passes to the designated-router traffic that
    is in m

    ... Continue reading in our forum

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