Hello, We're currently discussing necessity of multi-level hierarchy in OSPF on the WG mail list. The idea is to implement SPF-based interarea routing with more than two levels of topology abstraction and route aggregation (we have two levels in OSPF at the moment level1 being intra-area routing and level2 being the inter-area one). I have some thoughts on how this could be done, but the main question is whether there is a demand for it or not. Everyone is really welcome to share opinions. Thanks in advance, ------------------------------------------------------------------ Alex D. Zinin, Consultant CCSI #98966 CCIE #4015 AMT Group / ISL Cisco Systems Gold Certified Partner http://www.amt.ru irc: //EFNET/#cisco, //irc.msn.com/#NetCisco [Ustas]