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

It would be reflected back to R1.

--
Marko Milivojevic - CCIE #18427
Senior Technical Instructor - IPexpert
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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
>
> B B B B  s0/1
> R1--------------------R2----------------------R3-
> B |B  fa0/1 B B B B B B B B B B B B B B B B B B B B  |
> B |B B B B B B B B B B B B B B B B B B B B B B B  |
> B |B B B B B B B B B B B B B B B B B B B B B B B  |
> B |-------------------------|
>
>
> 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
>> >> >
>> >> >
>> >> > --
>> >> > With Warmest Regards,
>> >> >
>> >> > CCIE KID
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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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