R0106-HP MSR Router Series ACL and QoS Configuration Guide(V7)

48
T
yp
e Number of
q
ueues Advanta
g
es Disadvanta
g
es
WFQ Configurable
• Easy to configure.
• Bandwidth guarantee for
packets from cooperative
(interactive) sources (such as
TCP packets).
• Reduces jitter.
• Reduces the delay for
interactive applications with
a small amount of data.
• Bandwidth assignment
based on traffic priority.
• Automatic bandwidth
reassignment to increase
bandwidth for each class
when the number of traffic
classes decreases.
The processing speed is slower than
FIFO.
CBQ
Configurable (0 to
64)
• Flexible traffic classification
based on rules and
differentiated queue
scheduling mechanisms for
EF, AF and BE services.
• Highly precise bandwidth
guarantee and queue
scheduling on the basis of
AF service weights for
various AF services.
• Absolute preferential queue
scheduling for the EF service
to meet the delay
requirement of real-time
data.
• Overcomes the PQ
disadvantage where some
low-priority queues are not
serviced by restricting the
high-priority traffic.
• WFQ scheduling for
best-effort traffic (the default
class).
The system overheads are large.
Configuring the FIFO queue size
FIFO is the default queue scheduling mechanism for an interface, and the FIFO queue size is
configurable. Queue length can affect delay and packet loss ratio.
You must enable the rate limit function for the queuing function to take effect on a subinterface.
To configure the FIFO queue size: