Summarized advertised gateway
prefixes for route advertisement is now generally available. You can specify
aggregated (summarized) prefixes for an Azure gateway to advertise to your
on-premises networks, rather than having every individual virtual network
address space advertised. The capability is supported on both ExpressRoute
Gateway and VPN Gateway, and covers IPv4 and IPv6 address spaces.
Large hub-and-spoke deployments
often approach the advertised-prefix limits of ExpressRoute and VPN Gateway as
spokes are added. Advertising a covering prefix such as 10.0.0.0/16 in place of
hundreds of individual spoke prefixes keeps route counts well within those
limits and lets you keep growing an environment without re-architecting the
address plan or splitting virtual networks. Any spoke address space that falls
outside the summarized prefix continues to be advertised on its own, so
existing connectivity is preserved when you turn the feature on.
Learn
more.