SROS Command Line Interface Reference Guide
Quality of Service (QoS) Map Commands
5991-2114
© Copyright 2007 Hewlett-Packard Development Company, L.P.
1392
bandwidth [percent
<value>
| remaining percent
<value>
|
<value>
]
Use the
bandwidth
command to specify bandwidth allocation for individual traffic classes (for CBWFQ
configurations). Use the
no
form of this command to remove a configured bandwidth allocation.
Syntax Description
percent
<value>
Allocates a minimum bandwidth for a traffic class, specifying the
minimum as a percentage of the total interface bandwidth. See
Functional Notes
for more details.
remaining percent
<value>
Allocates a minimum bandwidth for a traffic class, specifying the
minimum as a percentage of the total interface bandwidth not allocated
to priority classes in the QoS map. See
Functional Notes
for more
details.
<value>
Allocates the minimum bandwidth for a traffic class, specifying the
minimum as an absolute bandwidth in kilobits per second (Range: 8 to
2,000,000 kbps).
Default Values
By default, there is no bandwidth allocation configured for a QoS map entry.
Functional Notes
When configuring
bandwidth
allocations for CBWFQ, there are a few rules that must be obeyed.
1.
The units of the bandwidth (kbps, percent, or remaining percent) must be consistent for all class-based
entries (using the
bandwidth
command) in a QoS map set.
2.
The total bandwidth between all
priority
entries and class-based entries (
bandwidth
) in a QoS map
set should not be configured beyond the specified
max-reserved-bandwidth
(default 75 percent) on
the interface that the QoS policy is applied to (using the
qos-policy
command), or the map will be
disabled. Even with the configuration limit, class-based queues can still use more than the
max-reserved-bandwidth
limitation, up to 100% of the bandwidth, if enough traffic is present.
When the configured QoS map is applied to a physical interface, the SROS displays bandwidth
information for the map and the physical interface. For example, the Frame Relay interface (
fr 1
) has
been connected to the E1 interface (
e1 1/1
) using the
bind
command. Applying the QoS map
(
MyMapA
) to the Frame Relay interface (
fr 1
) produces the following status message:
2005.08.09 07:28:22 QOS.INTERFACE QOS policy "MyMapA" requires 1288 kbps of bandwidth
and 1488 kbps is now available for interface fr 1 -> the QOS policy for this port has been forced
ACTIVE.
This status message displays the sum total of the bandwidths specified in the QoS map (1288 kbps)
and the available interface bandwidth using the total line rate configured on the interface (1488 kbps).
3.
Up to 4 class-based entries (
bandwidth
commands) can be configured in a particular QoS map set.
Up to 16 class-based entries can be configured (four entries on four QoS maps).
4.
Within a QoS map entry, CBWFQ bandwidth and low latency priority actions are mutually exclusive.
However, bandwidth and priority actions may be applied to different entries in the same QoS map.
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