February 22, 2008
Page 1 of 29
QoS Configuration
This
chapter
describes
the
QoS
feature
as
it
is
implemented
on
the
Matrix
N
‐
Series
Switch/Router,
SecureStack,
and
Secure
Switch.
What Is Quality of Service?
Quality
of
Service
(QoS)
is:
•
A
mechanism
for
the
management
of
bandwidth
•
The
ability
to
give
preferential
treatment
to
some
packets
over
others
•
Based
upon
packet
classification
and
forwarding
treatment
You
configure
packet
preference
and
forwarding
treatment
based
upon
a
flow’s
sensitivity
to
delay,
delay
variation
(jitter),
bandwidth,
availability
and
packet
drop.
QoS
uses
packet
priority,
in
conjunction
with
queue
treatment
configuration,
to
determine
the
interface’s
inbound
and
forwarding
behavior
for
this
packet.
Packet
preference
and
forwarding
treatment
for
a
given
flow
can
be
applied
to
roles
configured
in
Enterasys
policy.
Why Would I Use It in My Network?
Without
QoS,
all
packets
are
treated
as
though
the
delivery
requirements
and
characteristics
of
any
given
packet
are
equal
to
any
other
packet.
In
other
words,
non
‐
QoS
packet
delivery
is
not
able
to
take
into
account
application
sensitivity
to
packet
delay,
jitter,
amount
of
bandwidth
Note:
Please see the
Enterasys Matrix™ X Secure Core Router Configuration Guide
for a
complete discussion of QoS as it applies to the Matrix X-Series.
For information about...
Refer to page...
What Is Quality of Service?
1
Why Would I Use It in My Network?
1
How Can I Implement Quality of Service?
2
Quality of Service Overview
2
Understanding QoS Configuration on the Matrix N-Series
9
Feature Differences
20
The QoS CLI Command Flow
21
QoS Configuration Example
23
Terms and Definitions
28
