Which DSCP class selector is necessary to mark scavenger traffic?

DSCP CS1 is conventionally used to mark scavenger or best-effort-plus traffic, signifying that it is the lowest priority traffic type and should be dropped first during congestion. This ensures that critical real-time and business-critical traffic receive preferential treatment.

AF21 is typically used for lower-priority assured forwarding traffic, not specifically for scavenger traffic which is the lowest priority.

AF11 is used for a different class of assured forwarding traffic, indicating a higher priority than scavenger traffic.

CS2 is generally used for signalling traffic or network control traffic of a higher priority than scavenger traffic.