Understanding QoS Configuration on the Matrix N-Series
February 22, 2008
Page 13 of 29
•
Optionally,
specify
port
‐
group
Name,
associated
ports,
and
arb
‐
percentage
or
arb
‐
slices
Port-Groups: IRL Configuration
IRL
Port
‐
Groups
contain
user
settings
for
specific
types
of
ports
and
their
matching
inbound
rate
limiting
configurations.
Port
groups
0.0
and
0.1
exist
by
default.
Each
new
group
can
be
configured
with
a
name
and
ports
added
to
each
group
according
to
device
port
‐
type.
Use
the
show
cos
port
‐
config
irl
command
to
display
each
IRL
port
‐
group
configured
by
group
and
type,
with
group
name
and
associated
ports.
The
following
example
displays
default
values
for
the
show
cos
port
‐
config
irl
command
output:
Additional
port
groups
can
be
created
using
the
set
cos
port
‐
config
irl
command.
Port
group
name
and
associated
ports
can
be
configured.
You
need
to:
•
Identify
the
port
‐
group
for
configuration
•
Optionally,
specify
port
‐
group
Name
and
associated
ports
Configuring CoS Port-Resource
Physical
rate
limiters
and
rate
shapers
are
configured
in
CoS
port
resources.
Resources
map
directly
to
the
number
of
queues
and
rate
limiters
supported
by
each
port
‐
type.
Remember,
group
0.0
supports
16
TxQ
resources
and
32
IRL
resources
while
group
0.1
supports
4
TxQ
resources
and
8
IRL
resources.
Resources
exist
for
each
port
group
and
are
indexed
as
port
‐
group.port
‐
type
resource
‐
index
.
Port
‐
resources
initially
default
to
none,
as
rate
limiting
and
shaping
is
not
required.
CoS TxQ Port-Resource (Outbound Rate Shapers)
Rate
shaping
throttles
the
rate
at
which
queues
transmit
packets.
See
Rate
Shaping
on
page 8
for
a
general
discussion
of
rate
shaping.
Rate
shaping
is
TCP
friendly;
it
buffers
packets
that
are
above
the
rate
rather
than
drop
them.
CoS
rate
shaping
allows
you
to
configure
rate
shapers
based
on
a
unit
rate
(kilobits/second,
megabits/second,
gigabits/second),
or
a
percentage
of
the
port’s
line
speed.
The
show
cos
port
‐
resource
txq
command
displays
resources
for
each
port
group
created
along
with
the
resource
index
(physical
queue).
By
default,
no
resources
are
configured
for
TxQ
port
‐
resources.
Rates
displayed
as
none
indicate
no
resources
exist.
The
default
Rate
Shaping
algorithm
is
tail
‐
drop
and
is
not
configurable.
Matrix(su)->
show cos port-config irl
Inbound Rate Limiting Port Configuration Entries
----------------------------------------------------------------------
Port Group Name :DFE-P 32 IRL
Port Group :0
Port Type :0
Assigned Ports :ge.3.1-12;ge.4.1-9
----------------------------------------------------------------------
Port Group Name :DFE-P 8 IRL
Port Group :0
Port Type :1
Assigned Ports :ge.1.1-18;fe.2.1-48;ge.5.1-60;ge.6.1-30;ge.7.1-30
----------------------------------------------------------------------
