Posted by: Richard @ Configureterminal.com | May 9, 2008

Multiprotocol BGP – IPv4 Multicast

To route multicast traffic between AS’ MBGP is the tool of choice….

RFC 2283 = two new BGP attributes:

  1. Multiprotocol Reachable NLRI (MP_REACH_NLRI)
    • Type 14
    • Optional and nontransitive
    • Always an IPv4 prefix describing feasible routes of one or more multicast sources to advertise (not used for packet forwarding, used for RPF checks)
      • Address Family Information + Next Hop Information + NLRI triples
        • Address Family Information = Address Family Identifier (AFI) and a Subsequent AFI (Sub-AFI)
          • AFI always = 1 (IPv4)
          • Sub-AFI =
            1. Unicast route info only
            2. Multicast RPF info only
            3. Unicast routing info + multicast RPF info
  2. Multiprotocol Unreachable NLRI (MP_UNREACH_NLRI)
    • Type 15
    • Optional and nontransitive
    • Always an IPv4 prefix describing feasible routes of one or more multicast sources to withdraw
      • Address Family Information + Unfeasible Routes Length + Withdrawn Routes triples
        • Address Family Information = Address Family Identifier (AFI) and a Subsequent AFI
          • AFI = 1
          • Sub-AFI =
            1. Unicast route info only
            2. Multicast RPF info only
            3. Unicast routing info + multicast RPF info

The new attributes enable BGP to inform a peer of prefixes to be used for unicast routing, multicast RPF, or both.

 

Here is a diagram showing a configuration example:

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Responses

  1. Hello,
    I am very curious of which software is used to draw this kind of network diagrams, the ones in which the routers are red. I like it very much and i would like to buy that specific software. Can you tell me please?

    • Hi Valentin, the software is in-fact Microsoft Visio Professional and the shapes can be found under the “Network Symbols” shapes tab when a new “Detailed Network Diagram” has been created.


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