[Xorp-users] XORP and multicast promiscuous mode

[Pavlin Radoslavov]

hiren joshi <joshihirenn at gmail.com> wrote:

> I believe that XORP (and all other multicast (pim, igmp, ...) routers) uses
> multicast promiscuous mode to capture all multicast packets.
> Means they catch all ethernet frames with multicast bit set to 1.
> Am I right?

Yes, all frames with the multicast bit set are captured by the
network interfaces, but only those that contain IP packets get
through the IP stack in the kernel.

> Also, what about LANs not using shared media to forward frames.

Do you mean other LANs like FDDI and Token Ring?
It is similar story, but the exact details depend on the particular
technology.

Pavlin

> Thanks in advance.
> 
> Regards,
> -hiren
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