> > looks to me that you are trying to steer the discussion towards the BGP > based solution. Not something I'm interested on this thread. >
Not at all. It was you not me who used argument that UPA/PUA is useful for networks with no BGP ... example: Quote: *"I have explained that several times to you. There are SP networksrunning the services on top of p2p IP sec tunnels for example, with no BGP."* > > Also not all tunnels have keepalives. I am talking about mGRE > > encapsulation as an example where you simply encapsulate and have no > > idea other than consulting RIB if the dst node is up or down. > > in such case you can not use summarization at all. > Ok. Good to know :). Best, R. PS. Btw important point. Yes networks experience scale limits. But those limits are usually not due to exponential grow of number of PEs. Such grow is often associated with moving network services from routers to compute blades. And guess what protocol is used in underlay to those compute blades ... BGP :).
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