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Forum Replies

  1. Hi Siva,

    That’s the entire multicast range (class D) but the administratively scope is the range from through

    You don’t want to filter the 224.x.x.x range, this is also used by protocols like OSPF, EIGRP, HSRP, VRRP, etc.


  2. thanks a ton.

    so there are multiple ways multiple protocols to achieve multicast in a network .
    but talking about today’s real time network , is it correct to say that PIM SPARSE MODE is popular and mostly seen.

  3. Hi Rene/Andrew,

    Can you please help in understating when multicast-routing distributed needs to be used ? I read reference of stackable switches.
    So is it mandatory that if we have stacked swithces which are participating in L-3 routing , we must use multicast-routing distributed instead multicast-routing ?


  4. Hello Abhishek!

    The main purpose of the multicast-routing distributed command is to take advantage of the Multicast Distributed Switching (MDS) functionality that is available on high end Cisco L3 switching devices. MDS is accomplished using a forwarding data structure called a Multicast Forwarding Information Base (MFIB), which is a subset of the routing table. The multicast-routing distributed command essentially enables multicast routing on an L3 device. There is no alternative multicast-routing command. Counterintuativly, the distributedkey word indicat

    ... Continue reading in our forum

  5. Hello Bilal,

    The term “group address” might be a bit confusing. In reality, a multicast address is just a destination IP address. The main difference is that we call them “group” addresses since a single multicast IP address can represent a “group” of receivers.

    We still have one destination address (a multicast address) but instead of forwarding an IP packet from A > B, we can forward it from A > everyone who listens to the multicast address.


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