When a network
experiences congestion and delay, some packets must be dropped. JUNOS
software class-of-service (CoS) allows you to divide traffic into
classes and offer various levels of throughput and packet loss when
congestion occurs.
This allows packet loss to happen according to
the rules you configure.
For interfaces that carry IPv4 and MPLS traffic, you can configure
the JUNOS software CoS features to provide multiple classes of service
for different applications.
On the device, you can configure multiple
forwarding classes for transmitting packets, define which packets
are placed into each output queue, schedule the transmission service
level for each queue, and manage congestion using a random early detection
(RED) algorithm.
Traffic shaping is the allocation of the appropriate amount
of network bandwidth to every user and application on an interface.
The appropriate amount of bandwidth is defined as cost-effective carrying
capacity at a guaranteed CoS.
You can use a J-series Services Router
or an SRX-series services gateway to control traffic rate by applying
classifiers and shapers.
The CoS features provide a set of mechanisms that you can use
to provide differentiated services when best-effort delivery is insufficient.
