Generally Available: Summarized advertised gateway prefixes for route advertisement

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.

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