7.7. Considerations on Traffic Filtering Action Interference

7.7. Considerations on Traffic Filtering Action Interference

Since Traffic Filtering Actions are represented as BGP extended community values, Traffic Filtering Actions may interfere with each other (e.g., there may be more than one conflicting traffic-rate-bytes Traffic Filtering Action associated with a single Flow Specification). Traffic Filtering Action interference has no impact on BGP propagation of Flow Specifications (all communities are propagated according to policies).

If a Flow Specification associated with interfering Traffic Filtering Actions is selected for packet forwarding, it is an implementation decision which of the interfering Traffic Filtering Actions are selected. Implementors of this specification SHOULD document the behavior of their implementation in such cases.

Operators are encouraged to make use of the BGP policy framework supported by their implementation in order to achieve a predictable behavior. See also Section 12.