BB maintains the list of BAR requests in the database and deletes them when the period is over.
When the BB receives a BAR request, it identifies the SLA corresponding to the BAR request (using the SLA ID) and determines whether the request can be allowed
- If the request succeeds, the BB sends a configuration message to the leaf router (whose router ID is specified in the BAR) with the DSCP that is assigned for the flow, to do the policing and marking. It returns a ‘SUCCESS’ message to the host.
- If the request fails, the BB sends a ‘FAIL’ message to the host.