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 total bandwidth charges of all the Azure resources in a specific time period.
From Azure Portal,
- Navigate to the subscription and select "Cost Analysis" from left pane.
- From the top right, (highlighted as green), change "Cost by resource" to "Services"
- Once done, you can change the time period as required.
- Under this new tab, you can get the "Bandwidth" cost
- As inbound data transfer is free, you will see all the egress data transfer's cost.
- NOTE : Bandwidth refers to data moving in and out of Azure data centers, as well as data moving between Azure data centers; other transfers are explicitly covered by the Content Delivery Network, ExpressRoute pricing or Peering
- See : Bandwidth pricing.
- Similarly, you should be able to see the charges for Peering/ExR separately.
Kindly let us know if this helps or you need further assistance on this issue.
Thanks,
Kapil