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On May 12, 2013, at 1:41 AM, Glen Kent <glen.k...@gmail.com> wrote: > > The other instance would be when say OSPF is used to manage the OOB network > and the ISIS is used for network reachability. > > Is there any other scenario? Yes, in virtualization world , where people no more want to waste their links that form loops, there are scenarios where you may have a TRILL deployment that runs over IS-IS while you have OSPF running side by side. -Jay