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8
QoS
Configuration
In
data
communications,
Quality
of
Service
(QoS)
is
the
ability
of
a
network
to
provide
differentiated
service
guarantees
for
diversified
traffic
in
terms
of
bandwidth,
delay,
jitter,
and
drop
rate.
On
traditional
IP
networks,
devices
treat
all
packets
equally
and
handle
them
using
the
first
in
first
out
(FIFO)
policy.
All
packets
share
the
resources
of
the
network
and
devices.
How
many
resources
the
packets
can
obtain
completely
depends
on
the
time
they
arrive.
This
service
is
called
best
‐
effort.
It
delivers
packets
to
their
destinations
as
possibly
as
it
can,
without
any
guarantee
for
delay,
jitter,
packet
loss
ratio,
reliability
and
so
on.
The
Internet
has
been
growing
along
with
the
fast
development
of
networking
technologies.
More
and
more
users
take
the
Internet
as
their
data
transmission
platform
to
implement
various
applications.
Besides
traditional
applications
such
as
WWW,
e
‐
and
FTP,
network
users
are
experiencing
new
services,
such
as
tele
‐
education,
telemedicine,
video
telephone,
videoconference
and
Video
‐
on
‐
Demand
(VoD).
The
enterprise
users
expect
to
connect
their
regional
branches
together
through
VPN
technologies
to
carry
out
operational
applications,
for
instance,
to
access
the
database
of
the
company
or
to
monitor
remote
devices
through
Telnet.
These
new
applications
have
one
thing
in
common,
that
is,
they
all
have
special
requirements
for
bandwidth,
delay,
and
jitter.
For
instance,
videoconference
and
VoD
need
large
bandwidth,
low
delay
and
jitter.
As
for
mission
‐
critical
applications,
such
as
transactions
and
Telnet,
they
may
not
require
large
bandwidth
but
do
require
low
delay
and
preferential
service
during
congestion.
8.1
QoS
Configuration
8.1.1
General
QoS
Configuration
You
can
enable
or
disable
the
priority
of
the
device.
8.1.2
Port
QoS
Configuration
802.1p,
port
‐
based
priority
and
DSCP
can
be
configured
for
each
port.
And
the
bottom
of
the
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