Routing information may be provided to VPN sites on demand to allow smaller VPN sites with smaller routing tables to communicate directly with other VPN sites. This allows the meshed VPN architecture to scale to a size larger than where each VPN site is required to store routing information for all other...http://www.google.com/patents/US7590074?utm_source=gb-gplus-sharePatent US7590074 - Method and apparatus for obtaining routing information on demand in a virtual private network
