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Question about multicasting

Discussion in 'Routing & Switching' started by r.h.lee, Feb 19, 2007.

  1. r.h.lee

    r.h.lee Gigabyte Poster

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    I understand that a unicast works through a packet being sent from the host, gets routed around, arrives at the destination sub/network, then gets delivered to the destination IP address. However, I have some questions.

    1. How does multicasting work?
    2. In particular, how does the source packet get replicated in sufficient copies for multiple recipients to receive the multicast packet?
     
    Certifications: MCSE, MCP+I, MCP, CCNA, A+
    WIP: CCDA
  2. NetEyeBall

    NetEyeBall Kilobyte Poster

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    Honestly I don't know much about the subject but did a quick search and found the following information:

    Multicast packets are replicated in the network by Cisco routers enabled with Protocol Independent Multicast (PIM) and other supporting multicast protocols resulting in the most efficient delivery of data to multiple receivers possible.

    http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/ipmulti.htm#wp1020671

    Maybe the article will help you out.
     
    Certifications: CCNA, A+, N+, MCSE 4.0, CCA
    WIP: CCDA, CCNP, Cisco Firewall

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