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4.11 Flows
Flows are used to distinguish the different levels of Quality of Service (QoS)
within a connection (see section 4.10 on page 20). A group of packets within a
connection can be given preferential treatment by classifying them into a flow.
Each flow is identified by either the p-bits or the DSCP values in the packet.
The flow determines the priority and reliability for the packets, along with the
bandwidth limitation or the policing to be applied on the flow. The priority
designates an output queue. The reliability indicates whether the packet
should be discarded if the EFN324 has insufficient empty buffers. The higher
the priority, the faster the packets are sent out. The higher the reliability, the
lower the probability of the packets getting discarded in overflow situations.
Flows within a connection to an uplink port handles traffic from all End-users
using the VLAN flow (see Figure 12 on page 23). This must be taken in
consideration when the connections and flows from the switching domain to
the uplink port are configured.
4.11.1 Flows in Connections
The EFN does not differentiate between uplink and downlink packet
processing. The flows must be configured correctly, accordingly to their
direction.
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