RE: Query regarding MLD Router Compatibility [RFC3810]

Hi Rajibkit,

The reason to do this is because in section 8.2.2.  In the Presence of MLDv1 
Multicast Address Listeners
"
   An MLDv2 host may be placed on a link where there are MLDv1 hosts.  A
   host MAY allow its MLDv2 Multicast Listener Report to be suppressed
   by a Version 1 Multicast Listener Report."

So the hosts in the network that were MLDv2 aware would not have send source 
specific info because they suppresed their reports due to MLDv1 reports.

Hope this helps.

Rgds,
Kishore


>From: "Rajib Karmakar" <[email protected]>
>To: [email protected], [email protected], [email protected], 
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>CC: [email protected]
>Subject: [magma] Query regarding MLD Router Compatibility [RFC3810]
>Date: Tue, 6 Feb 2007 17:17:16 +0530
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>----------------begin
>paste----------------------------------------------------------
>RFC 3810   Section 8.3.2.  In the Presence of MLDv1 Multicast Address
>Listeners
>
>   Note that when a router switches back to MLDv2 Multicast Address
>   Compatibility Mode for a multicast address, it takes some time to
>   regain source-specific state information.  Source-specific
>   information will be learned during the next General Query, but
>   sources that should be blocked will not be blocked until [Multicast
>   Address Listening Interval] after that.
>----------------end
>paste----------------------------------------------------------
>
>When a router switches back to MLDv2 Multicast Address Compatibility Mode
>why does it wait for Multicast Address Listening Interval after regaining
>source specific informations to block sources?
>
>Regards,
>Rajib Karmakar
>India


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