6.2. Routing, TM, Egress Pipeline and Deparser Control Flow Figure 4 (3) checks if the incoming packet is a valid IP packet and the agg metadata.saved is 0. If so, the packet being processed is not stored in the pool buffer and the normal routing process should be executed (Figure 4 (4)). Then, the packet should go through the TM, egress pipeline, and deparser.Because the tasks that need to be performed at the TM, egress pipeline, and deparser are standard procedures, which are not specific to the handling of packet aggregation, we do not present their detailed P4 implementations here.