From: Naresh Myaka (want2bccie@gmail.com)
Date: Fri Jun 29 2007 - 05:07:29 ART
Hi Douglas,
Thanks for the reply,
What u said is perfect, that router will follow basic unicasting for 1.1.1.1.
What if the incoming packet is mutlicast packet.
Will it still does the L2 lookup before L3 lookup and if it does then when
it finds Multicast MAC address in incoming packet's as destionation MAC
addres.
Regards,
Naresh Myaka
On 6/28/07, Douglas M Todd, Jr <dtodd@partners.org> wrote:
>
> Hi:
>
> R2 needs to do a lookup to know which interface to place the packet on.
> Thus the lookup happens before the rewrite on the L2 header (mac address
> as well as L2 technology). At this point it can then RW the L2 header to
> the correct framing for the interface.
>
> 1.1.1.1 is not a multicast address so it will just be unicast and follow
> the basics for unicast.
>
>
>
> Naresh Myaka wrote:
> > Hi GS,
> >
> > R1|F0/0------F0/1|R2|F0/0-----F0/0|R3|F0/1|1.1.1.1
> >
> > When R1 sends a unicast packets with destination address 1.1.1.1, and
> when
> > packet arrives on R2
> > before doing IP lookup does it checks for destionaton MAC address from
> > incoming packet.
> >
> > If it checks for the dest. MAC add. should it needs to match with MAC of
> > R2's incoming interface address.
> >
> > What if it is not match with incoming interface? as in multicast the
> Dest.
> > MAC address in incoming packet is Multicast
> > MAC address.
> >
> > Regards,
> > Naresh Myaka
> >
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