Interdomain Multicast

Hi,

 

If I have been told to configure interdomain multicast between two different AS then what should i configure: multicast family for MP-BGP or MSDP?

 

regards

Dev

Comments

  • Dev,

    It all depends on the scenario and the question. The clue I am sure is in the question being asked. I have not taken the lab as yet but working through the multicast on the IE SP COD they have an excellent example of why you need MP-BGP Multicast. From that example I would surmise the following:

    One thing to consider is reachability and RPF checks. RPF e.g. "show ip mroute" paths vary from IGP and multicast is unaware of those links as they are not enabled for multicast. Then each AS needs knowledge of the others networks and you then need to advertise them via the ipv4 multicast for reachability. So in my humble opinion if it is a "clean" set-up and the IGP/Multicast line up nicely then MSDP will suffice, however if they IGP path/multicast path differ then multicast needs to be made aware of networks in the "other AS" for reachability.

    Hope that helps and I am making sense.

    James

    ________________________________________
    From: [email protected] [[email protected]] On Behalf Of dev13 [[email protected]]
    Sent: Thursday, October 30, 2008 4:53 PM
    To: James Yeo
    Subject: [CCIE SP] Interdomain Multicast

    Hi,



    If I have been told to configure interdomain multicast between two different AS then what should i configure: multicast family for MP-BGP or MSDP?



    regards

    Dev



    Internetwork Expert - The Industry Leader in CCIE Preparation
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  • MP_BGP used to provide RPF information but MSDP used to manipulate multicast traffic so, both can be configured but it depends on the scenario.

    From: dev13 <[email protected]>
    To: [email protected]
    Sent: Thursday, October 30, 2008 4:53:47 PM
    Subject: [CCIE SP] Interdomain Multicast

    Hi,

     

    If I have been told to configure interdomain multicast between two different AS then what should i configure: multicast family for MP-BGP or MSDP?

     

    regards

    Dev




    Internetwork Expert - The Industry Leader in CCIE Preparation

    http://www.internetworkexpert.com



    Subscription information may be found at:

    http://www.ieoc.com/forums/ForumSubscriptions.aspx





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