BGP itself does not configure Quality of Service (QoS). However, BGP can exchange information with other routing protocols and services that can be configured to use QoS. For example, BGP can exchange MPLS labels with MPLS-enabled routers which can use these labels to prioritize traffic and provide differentiated QoS levels. Additionally, BGP can exchange policy information with other routers and services to help enforce QoS policies such as bandwidth guarantees or rate limiting. Ultimately, it is up to the network administrator to configure the necessary QoS mechanisms on the routers and services in the network.
