Post-Queuing Optimization
Traffic that has been
released from a queue by the scheduler according to queuing policy and shaping
then passes through a series of post-queuing optimizations. Post-queuing
optimizations help to ensure optimized delivery of packets across the network by
interleaving packets from small flows with packets of larger flows and also by
compressing packet headers.
Although localized queuing and
scheduling certainly can overcome the issue of localized latency, jitter, and
loss for interactive applications such as voice and video, upstream device
queues can still pose a threat to this traffic because the link will be shared
with other applications that transfer in bulk and use larger packets.
Furthermore, the links on upstream devices may also be points of aggregation for
a larger number of locations, thereby exacerbating the problem. Upstream network
devices that employ queuing may delay smaller packets even if the appropriate
level of queuing and service has been deployed on the first network device that
receives them.
Link fragmentation
and interleaving (LFI) is a means by which a router or other network device can
fragment larger packets from applications that transfer in bulk (such as file
transfers and print jobs) such that smaller packets from interactive voice
applications can be interleaved. This allows upstream devices to receive a fair
mix of packets from both types of applications and minimizes the opportunity for
larger packets to potentially delay the service of smaller packets for
higher-priority interactive applications.
You can also employ packet header
compression to minimize the amount of capacity consumed on the network by
overhead data such as packet headers, which can comprise an especially high
percentage of overall data given that these interactive applications are using
particularly small packet sizes.
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