Azure Adds BGP Traffic Engineering Tools for Hub Networks and Virtual WAN

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Microsoft Azure has introduced two features for advanced routing control in its cloud networking stack: advertised gateway prefix summarization on hub VNets and Route Maps for Azure Route Server, both currently in public preview. The summarizedGatewayPrefixes property allows administrators to replace multiple individual spoke prefixes with a single aggregated CIDR block advertised by ExpressRoute or VPN Gateways, helping avoid the 1,000-prefix advertisement cap on ExpressRoute private peering connections. Exceeding that cap causes the BGP session to drop entirely, making prefix summarization critical in large hub-and-spoke deployments with hundreds of spokes. Route Maps, now available in Virtual WAN, act as a policy engine that can inspect, modify, and filter BGP routes exchanged between a virtual hub and its connections in either inbound or outbound directions. Together, these tools bring on-premises-style traffic engineering capabilities to Azure, giving network architects finer control over how routes are propagated across hybrid and cloud-native environments.

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