Fifo; Wfq - HP MSR4080 Configuration Manual
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FIFO
Figure 14 FIFO queuing
As shown in
schedule queues. FIFO delivers packets depending on their arrival order: the packet that arrives earlier
is scheduled first. The only concern of FIFO is queue length, which affects delay and packet loss rate. On
a device, resources are assigned to packets depending on their arrival order and load status of the
device. The best-effort service model uses FIFO queuing.
FIFO does not address congestion problems. If only one FIFO output/input queue exists on a port, you
cannot ensure timely delivery of mission-critical or delay-sensitive traffic or smooth traffic jitter. If
malicious traffic occupies bandwidth aggressively, the problems increase. To control congestion and
prioritize forwarding of critical traffic, use other queue scheduling mechanisms, where multiple queues
can be configured. Within each queue, FIFO is still used.
WFQ
Figure 15 Weighted fair queuing (WFQ)
FQ is designed to equally allocate network resources to reduce the delay and jitter of each traffic flow as
much as possible. FQ follows these principles:
Different queues have fair dispatching opportunities for delay balancing among flows.
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Figure
14, the first in first out (FIFO) uses a single queue and does not classify traffic or
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