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Policy-Map Commands
12-86 Configuring Quality of Service
Example
These
commands
create
class
‐
map
class1
and
define
its
match
criteria:
XSR(config)#class-map class1
XSR(config-cmap<class1>)#match access-group 136
These
commands
create
the
policy
map
which
is
defined
to
contain
policy
specifications
for
class1
and
the
default
class:
XSR(config)#policy-map policy1
XSR(config-pmap<policy1>)#class class1
XSR(config-pmap-c<class1>)#bandwidth 2000
XSR(config-pmap-c<class1>)#queue-limit 40
XSR(config-pmap<policy1>)#class class-default
XSR(config-pmap-c<class-default>)#queue-limit 20
bandwidth
This
command
specifies
or
modify
the
bandwidth
allocated
for
a
class
belonging
to
a
policy
map.
It
is
used
in
conjunction
with
a
class
defined
by
the
class-map
command.
The
bandwidth
command
specifies
the
bandwidth
for
traffic
in
that
class.
Class
‐
Based
Weighted
Fair
Queueing
(CBWFQ)
derives
the
weight
for
packets
belonging
to
the
class
from
the
bandwidth
allocated
to
the
class.
CBWFQ
then
uses
the
weight
to
ensure
that
the
queue
for
the
class
is
serviced
fairly.
The
amount
of
bandwidth
can
be
specified
in
percentages
or
kilobits
per
second
(kbps).
When
configured
in
kbps
,
the
class
weight
is
calculated
as
a
ratio
of
the
bandwidth
specified
for
that
class
over
the
available
link
bandwidth.
The
available
link
bandwidth
is
equal
to
the
interface
bandwidth
minus
the
sum
of
all
bandwidth
reserved
for
low
latency
queues.
When
configured
in
percentages
,
the
class
weight
is
equal
to
the
bandwidth
percentages.
Configuring
bandwidth
in
percentages
is
most
useful
when
the
underlying
link
bandwidth
is
unknown,
changes
over
time,
or
the
relative
class
bandwidth
distributions
are
known.
For
interfaces
that
have
adaptive
shaping
rates,
CBWFQ
can
be
set
by
configuring
class
bandwidths
in
percentages.
The
following
restrictions
apply
to
the
bandwidth
command:
•
If
the
percent
keyword
is
used,
the
sum
of
class
bandwidth
percentages
cannot
exceed
100%
.
•
The
amount
of
bandwidth
set
should
be
large
enough
to
also
accommodate
Layer
2
overhead.
•
A
policy
map
can
have
all
the
class
bandwidths
specified
in
kbps
or
all
the
class
bandwidths
specified
in
percentages,
but
not
a
mix
of
both.
But,
the
unit
for
the
priority
command
in
the
priority
class
can
be
different
from
the
bandwidth
unit
of
the
CBWFQ.
Syntax
bandwidth
{
bandwidth-kbps
|
percent
percent
}
Note:
When the bandwidth of an interface is insufficient to satisfy the bandwidth of a policy map, the
interface becomes oversubscribed and some CBFWQ classes may become unable to transmit.
bandwidth-kbps
Amount
of
bandwidth,
in
kbps,
assigned
to
the
class.
percent
Available
bandwidth
percentage
assigned
to
the
class.
Содержание X-Pedition XSR
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Страница 10: ...viii...
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Страница 134: ...Bootrom Monitor Mode Commands 3 128 Configuring the XSR Platform...
Страница 278: ...VRRP Clear and Show Commands 5 202 Configuring the Internet Protocol...
Страница 352: ...IGMP Clear and Show Commands 7 104 Configuring IP Multicast...
Страница 406: ...Multilink Show Commands 8 136 Configuring the Point to Point Protocol...
Страница 436: ...Frame Relay Clear and Show Commands 9 112 Configuring Frame Relay...
Страница 460: ...Dialer Watch Commands 10 106 Configuring the Dialer Interface...