Route summarization for BGP in Azure

ares 201 Reputation points
2024-04-03T14:09:27.7966667+00:00

Is there a way to summarize subnets when sending routes from Azure to on-prem or other CSPs, or does Azure send every single subnet?

Azure ExpressRoute
Azure ExpressRoute
An Azure service that provides private connections between Azure datacenters and infrastructure, either on premises or in a colocation environment.
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  1. KapilAnanth-MSFT 35,001 Reputation points Microsoft Employee
    2024-04-04T04:09:55.72+00:00

    @ares ,

    Welcome to the Microsoft Q&A Platform. Thank you for reaching out & I hope you are doing well.

    Generally, Azure advertises the routes according to the VNET Ranges.

    I am not aware of any mechanism available to summarize the advertised prefixes in ExpressRoute.

    You can use Get-AzExpressRouteCircuitRouteTable , to get a list of all the routes advertised and learned.

    Hope this helps.

    Cheers,

    Kapil

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