Configuration Guide Configuring Data Plan
4.3.2 Overview
Broadcast Forwarding
Weight Control
Restricts the weights of packet types for broadcast forwarding, so as to protect RF resources from
being occupied by a certain type of packets and thereby guarantee normal forwarding of other
packets.
Broadcast Wireless
Forwarding Control
Controls whether to forward broadcast packets to the wireless network, so as to prevent useless
broadcast packets from occupying substantial RF resources.
4.3.3 Broadcast Forwarding Weight Control
Broadcast forwarding weight control is used to restrict a certain type of packets, so that the ratio of this type of packets is no
greater than the specified weight during broadcast forwarding.
4.3.3.1 Working Principle
The broadcast forwarding weight control function classifies packets at first into unicast packets, multicast packets, broadcast
packets, unknown multicast packets, and unknown unicast packets.
Classify packets. Packets may be roughly classified into the following types: unicast packets, multicast packets,
broadcast packets, unknown multicast packets, and unknown unicast packets.
Allocate a token bucket to each type of packets, and record the number of packets permitted to pass at this moment.
According to the configured broadcast forwarding weights, calculate the number of packets permitted to pass within
each interval, and adjust the sizes of the token buckets accordingly.
When a packet arrives, determine the type of the packet and check whether there is any token in the token bucket
corresponding to the packet type. If the token bucket contains a token, the packet is permitted to pass; otherwise, the
packet is discarded.
4.3.4 Broadcast Wireless Forwarding Control
The broadcast wireless forwarding control function is used to forward only partial packets that affect STAs to the wireless
network, so as to prevent useless broadcast packets from occupying substantial air interface resources.
4.3.4.1 Working Principle
Wireless networks differ from wired networks in performance. In a wireless network, air interface resources are shared by
STAs and APs which often becomes a bottleneck for STAs. Meanwhile, they are seized for a long time because broadcast
packets are sent at low rates.
In practice, some broadcast packets are useless for STAs. Forwarding these packets to the wireless network will result in
fewer air interface resources and worse user experience.
One solution is to classify broadcast packets for forwarding control. Only the packets of specified types are forwarded to the
wireless network.
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