Re: Multicast Graft and Prune Override

hi carlos,

not able to get u man in the first answer. Wat is the use of graft and
graft ack message. could u elaborate man

On Mon, Nov 21, 2011 at 7:34 PM, Carlos G Mendioroz <tron_at_huapi.ba.ar>wrote:

> Kid,
>
> 1) you don't know S before you ever receive a mcast packet. So you can not
> tell who to send a graft (no RPF interface).
>
> 2) sounds good to me. Two receivers on the same segment and one decides to
> PRUNE makes the other shout (JOIN) not to be forgotten :)
>
> -Carlos
>
> CCIE KID @ 21/11/2011 08:21 -0300 dixit:
>
>> Hi fellas,
>>
>> I was reading my Multicast theory and i have few doubts with the Dense
>> mode.
>>
>> 1)There is a Graft Ack message sent by the client to rejoin a particular
>> group , ( becasue already he is a member and then pruned and then again
>> joining ) , . At this point the First hop router should send just a Graft
>> Ack message to rejoin the group. If there is Graft concept. Why there is
>> the concept of Flooding n Pruning for every 3 minutes??
>>
>> Because Graft Ack just solves the purpose of joining again instead of
>> waiting for 3 minutes for the FHR to send the feed again.
>> Can some explain me the use of Graft message and Graft Ack in Multicast
>>
>>
>> 2)Regarding Prune Override .. If there are more than two routers say R1
>> and
>> R2 in a LAN domain. R3 is used as as the FHR towards the RP Now if a host
>> connected to R1 is sending a IGMP Leave message and now R1 sends a Group
>> specific query and if there is no host which replies to this query, now
>> then R1 will send a PIM prune message to 224.0.0.2 and now R2 receives it
>> and now it see that there is a host which is actively participating in
>> that
>> group and it sends a Prune override to R3 and now R3 still sends traffic
>> on
>> the link.
>>
>> Correct me if i am wrong in the above statement. Can some one explain my
>> understanding is correct or not.
>>
>> R3------------------| Sw1 |---------------R1--------Host 1
>> |
>> |
>> |
>> R2
>> |
>> |
>> |
>> Host 2
>> This is my scenario
>>
>>
>> With Warmest Regards,
>>
>> CCIE KID
>> CCIE#29992 (Security)
>>
>>
>> Blogs and organic groups at http://www.ccie.net
>>
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>>
>>
>>
>>
>>
>>
>>
> --
> Carlos G Mendioroz <tron_at_huapi.ba.ar> LW7 EQI Argentina
>

-- 
With Warmest Regards,
CCIE KID
CCIE#29992 (Security)
Blogs and organic groups at http://www.ccie.net