Quality of Service
Motorola, Inc.
549453-001-00-a
Page 34 of 51
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Standards
IEEE 802.1P, WRED, WFQ, IP TOS based on RFC1275
Number of queues
4 queues per port
Packet classifiers
Static classifier: All packets received on a port are assigned to a single queue
Dynamic classifier: Packets are assigned to a queue based on their IP TOS or 802.1P
WFQ queue mode
Administrator selectable queue weight. Queue weights are calculated as a percentage
of the cumulative weights.
Using WFQ, any queue can burst up to the maximum bitrate of the line. This can occur if
no packets in a higher priority queue are waiting to transmit. If you wish to apply strict
rules and limit a low priority queue to a fixed amount, use the “egress shaping”
command.
Priority queue mode
Strict priority over all lower queues. Note that Priority queuing can be mixed with other
queuing methods to provide a low latency, low jitter service for sensitive services such as
VoIP. For example, if the critical queue were assigned a Priority mode, then those
packets would transmit on the port before other packets in the buffers.
Shaping queue mode
Apply traffic shaping rules to individual queues. Each queue is assigned a fixed amount
of bitrate. The cumulative bitrate of all the queues should not exceed the total line rate of
the port.
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network qos [enable | disable]
Enable qos support. To disable qos, use
network qos disable
network qos interface priority <interface-id> mode <mode> [level <level>]
Sets the packet classifier mode for the port receiving packets.
Where;
Mode
is
dynamic
or
static
. Dynamic classifier will read the IP TOS or 802.1P precedence bit of the incoming
packet. Static classifier assigns all packets received on the port to one of the four queues
Level
is the default queue for packets received on the port. When the mode is dynamic, then level is assigned to
packets that do not match the classifier. When the mode is set to static, then level applies to all packets received
on the port.
The four queues are
critical, high, medium,
and
low
.
network qos classification <method>
where
method
is either
802.1p
or
tos
