Re: RPF Query!!!!!!!!!!

Ok marko got ur point buddy
thanks for the help
now understood completely after reading RFC for RPF in multicasting

Thanks Marko

On Thu, Nov 18, 2010 at 8:09 PM, CCIE KID <eliteccie_at_gmail.com> wrote:

> It will take both the paths or else which path the multicast packet wll
> take to reach the source
> it cant take two paths
> which path it will take
>
>
> On Thu, Nov 18, 2010 at 8:05 PM, Marko Milivojevic <markom_at_ipexpert.com>wrote:
>
>> It would be reflected back to R1.
>>
>> --
>> Marko Milivojevic - CCIE #18427
>> Senior Technical Instructor - IPexpert
>>
>> FREE CCIE training: http://bit.ly/vLecture
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>>
>> On Thu, Nov 18, 2010 at 14:33, CCIE KID <eliteccie_at_gmail.com> wrote:
>> > ok marko i understood ur point
>> > So in ur scenario in the full mesh topology the loop happens
>> > wat about this scenario
>> >
>> > s0/1
>> > R1--------------------R2----------------------R3-
>> > | fa0/1 |
>> > | |
>> > | |
>> > |-------------------------|
>> >
>> >
>> > In this scenario if in IGP there are two routes which R2 can reach R1
>> > thorugh serial and fastetherent
>> > In this case wat would be the multicast path
>> > which path it would take if the packet comes from two paths
>> >
>> >
>> > On Thu, Nov 18, 2010 at 7:54 PM, Marko Milivojevic <markom_at_ipexpert.com
>> >
>> > wrote:
>> >>
>> >> There is no RPF in that scenario and that's what would happen.
>> >> However, with RPF, when each of the routers receives copy of the
>> >> traffic from non-RPF interface, it will drop it.
>> >>
>> >> --
>> >> Marko Milivojevic - CCIE #18427
>> >> Senior Technical Instructor - IPexpert
>> >>
>> >> FREE CCIE training: http://bit.ly/vLecture
>> >>
>> >> Mailto: markom_at_ipexpert.com
>> >> Telephone: +1.810.326.1444
>> >> Web: http://www.ipexpert.com/
>> >>
>> >> On Thu, Nov 18, 2010 at 14:21, CCIE KID <eliteccie_at_gmail.com> wrote:
>> >> > No marko can u be little more clear
>> >> > wat is ur scenario deals wid RPF
>> >> >
>> >> >
>> >> > On Thu, Nov 18, 2010 at 7:47 PM, Marko Milivojevic <
>> markom_at_ipexpert.com>
>> >> > wrote:
>> >> >>
>> >> >> A---B
>> >> >> | X |
>> >> >> C---D
>> >> >>
>> >> >> So, we have full mesh of connections between A, B, C and D. Source
>> is
>> >> >> attached to A. Source sends packet, A replicates it to B, C and D. C
>> >> >> replicates the packet to B and D (B and D receive their 2nd copy of
>> >> >> the same traffic). When B receives this traffic for C it replicates
>> it
>> >> >> to D (3rd copy), and back to A. A replicates it back to C, D... etc
>> >> >> etc etc. You get the idea?
>> >> >>
>> >> >> --
>> >> >> Marko Milivojevic - CCIE #18427
>> >> >> Senior Technical Instructor - IPexpert
>> >> >>
>> >> >> FREE CCIE training: http://bit.ly/vLecture
>> >> >>
>> >> >> Mailto: markom_at_ipexpert.com
>> >> >> Telephone: +1.810.326.1444
>> >> >> Web: http://www.ipexpert.com/
>> >> >>
>> >> >> On Thu, Nov 18, 2010 at 14:10, CCIE KID <eliteccie_at_gmail.com>
>> wrote:
>> >> >> > Hey i know the RPF check happens every time when a multicast
>> packet
>> >> >> > comes to
>> >> >> > router to check whether the same interface can be used to reach
>> the
>> >> >> > source
>> >> >> > of the multicast feed.Why does this has been done?? To avoid
>> >> >> > loops!!!!
>> >> >> > *WHy
>> >> >> > RPF check is mandatory for a multicast packet*?
>> >> >> > If to avoid loops Can u give me a classic case of loop formation
>> in
>> >> >> > multicasting when RPF is not present
>> >> >> >
>> >> >> >
>> >> >> > --
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>> >> >> >
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>> >> >> >
>> >> >> >
>> >> >> >
>> >> >
>> >> >
>> >> >
>> >> > --
>> >> > With Warmest Regards,
>> >> >
>> >> > CCIE KID
>> >> > IN PURSUIT OF CCIE
>> >> >
>> >
>> >
>> >
>> > --
>> > With Warmest Regards,
>> >
>> > CCIE KID
>> > IN PURSUIT OF CCIE
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>>
>
>
>
> --
> With Warmest Regards,
>
> CCIE KID
> IN PURSUIT OF CCIE
>

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