Welcome to the Microsoft Q&A Platform. Thank you for reaching out & I hope you are doing well.
I understand that you would like to know the top talkers in an ExpressRoute Circuit Connection.
Please note that ExpressRoute is a service used to provide direct connectivity using BGP, and as such, it only logs metrics related to the configuration/infrastructure relating to ExpressRoute.
- ExpressRoute circuit : https://learn.microsoft.com/en-us/azure/expressroute/expressroute-monitoring-metrics-alerts#expressroute-circuit
- ExpressRoute gateways : https://learn.microsoft.com/en-us/azure/expressroute/expressroute-monitoring-metrics-alerts#expressroute-gateways
- ExpressRoute Gateway connections : https://learn.microsoft.com/en-us/azure/expressroute/expressroute-monitoring-metrics-alerts#expressroute-gateway-connections
Now, in your scenario, you should consider using a service that provides Traffic Analytics for the entire VNet(s).
You must enable NSG Flow Logs and visualize it using Traffic Analytics
Your specific use case is documented here : Traffic Distribution across Top IPs
Thanks,
Kapil
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