Qos Reserved-Bandwidth - HP HSR6800 Command Reference Manual

0 kbps for the other virtual interfaces such as tunnel interfaces, Layer 3 aggregate interfaces, HDLC
•
link bundle interfaces, and RPR logical interfaces.
On an MP-group interface or MFR interface configured with the qos max-bandwidth command, AF and
EF perform queue bandwidth check and calculation based on the bandwidth specified with the qos
max-bandwidth command. On an MP-group interface or MFR interface without the qos max-bandwidth
command configured, if the sum of sub-channel bandwidth equals to or exceeds the sum of AF
bandwidth and EF bandwidth, AF and EF calculate bandwidth based on the actual interface bandwidth.
Otherwise, AF and EF calculate bandwidth based on 1 Gbps of bandwidth, and the message indicating
insufficient bandwidth is displayed. In the latter case, the queuing function might fail to take effect. You
can use the qos reserved-bandwidth command to set the maximum percentage of the reserved
bandwidth to the available bandwidth.
On tunnel interfaces, subinterfaces, Layer 3 aggregate interfaces, HDLC link bundle interfaces, RPR
logical interfaces, or VT interfaces configured with PPPoE, PPPoA, or PPPoEoA, you must configure the
qos max-bandwidth command to provide the base bandwidth for CBQ calculation.
Examples
# Set the maximum available bandwidth of GigabitEthernet 1/0/1 to 16 kbps.
<Sysname> system-view
[Sysname] interface gigabitethernet 1/0/1
[Sysname-GigabitEthernet1/0/1] qos max-bandwidth 16

qos reserved-bandwidth

Use qos reserved-bandwidth to set the maximum reserved bandwidth as a percentage of available
bandwidth of the interface.
Use undo qos reserved-bandwidth to restore the default.
Syntax
qos reserved-bandwidth pct percent
undo qos reserved-bandwidth
Views
Interface view, PVC view
Default command level
2: System level
Parameters
pct percent: Specifies the percentage of available bandwidth to be reserved. The value range is 1 to 100,
and the default is 80.
Usage guidelines
The maximum reserved bandwidth is set on a per-interface basis. It decides the maximum bandwidth
assignable for the QoS queues on an interface. It is typically set no greater than 80% of available
bandwidth, considering the bandwidth for control traffic and Layer 2 frame headers.
Use the default maximum reserved bandwidth setting in normal cases. When tuning the setting, make
sure that the Layer 2 frame header plus the data traffic is under the maximum available bandwidth of the
interface.
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