R2511-HP MSR Router Series ACL and QoS Configuration Guide(V5)

51
T
yp
e Number of
q
ueues Advanta
g
es Disadvanta
g
es
CBQ
Configurable (0 to
64)
• Flexible traffic classification
based on various 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.
• Absolutely preferential
queue scheduling for the EF
service to meet the delay
requirement of real-time
data.
• Overcomes the
disadvantage of PQ that
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.
If the burst traffic is too heavy, increase the queue length to make queue scheduling more accurate.
Configuring the FIFO queue size
FIFO is the default queue scheduling mechanism for an interface or PVC, and the FIFO queue size is
configurable.
Configuration procedure
To configure the FIFO queue size:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter interface view or PVC view.
• Enter interface view:
interface interface-type interface-number
• Enter PVC view:
a. interface atm interface-number
b. pvc vpi/vci
N/A
3. Configure the FIFO queue size.
qos fifo queue-length queue-length
The default FIFO
queue size is
75.
You must enable the rate limit function for the queuing function to take effect on these interfaces: tunnel
interfaces, subinterfaces, HDLC link bundle interfaces, and VT/dialer interfaces configured with PPPoE,