On Tuesday, March 26, 2002, at 01:39 , Radia Perlman - Boston Center for
Networking wrote:
> What does "OT" at the beginning of the subject line mean?
>
> And to argue a bit with Ran:
>>> Part of the operational challenge of IP Multicast is that,
>>> at present, as deployed, there is no IGP/EGP split.
>
> Actually, I don't even believe an IGP/EGP split is necessarily the
> right thing for unicast routing. (Assuming the phrase "IGP/EGP
> split" means "two different routing protocols".
Not what I meant.
> If it instead means, levels of hierarchy,
This is what I meant.
> I don't think an IGP/EGP split helps multicast, since a multicast group
> has the potential of having members all over the place.
It helps because the split provides a place where an operator
can easily apply appropriate policy. If there are no levels of
heirarchy, then there is no easy/obvious place to apply that policy.
Applying policy is NOT impossible in the current situation,
but it IS very much harder for lack of heirarchy. And a likely
policy is to choose not to carry certain mcast groups, which might
reduce the amount of mcast routing to be done and make it easier
to deploy.
Ran
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