Ieee 802.1P To Ipqos Queue Mapping - ZyXEL Communications MSC1024G Series User Manual

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• Level: This is the Strict Priority Queuing (SPQ) priority level (0~7) for each queue. 0 is
the lowest priority and 7 is the highest. SPQ services queues by priority only. As traffic
comes into the switch, traffic in the highest priority queue (Q7) is transmitted first. When
that queue empties, traffic in the next highest-priority queue (Q6) is transmitted until Q6
empties, and then Q5 traffic is transmitted and so on. If higher priority queues never
empty, then traffic on lower priority queues never gets sent. SPQ does not automatically
adapt to changing network requirements.
• Weight: This is the queue weight (1~127). The Device uses Weighted Round Robin
(WRR) scheduling to service queues of the same priority level on a rotating basis based on
their queue weight. The higher a queue's weight, the more service it gets. This queuing
mechanism is highly efficient in that it divides any available bandwidth across the
different traffic queues and returns to queues that have not yet emptied.

13.23.2 IEEE 802.1p to IPQoS Queue Mapping

The following table shows the system's default IEEE 802.1p to switch queues and the (fixed)
switch queue mapping to IPQoS queue mapping.
Table 165 IEEE 802.1p to IPQoS Default Queue Mapping
IEEE 802.1p
Priority
0
1
2
3
4
5
6
7
• IEEE 802.1p Priority: This column represents the IEEE 802.1p priorities of IEEE
802.1p (priority) tagged packets destined for a subscriber.
• Switch Queues: This column represents the mapping between IEEE 802.1p priorities and
the MSC's physical queues. You can configure this mapping, although it is highly
recommended to use the default mapping.
• IPQoS Profile with 1 Queue ~ IPQoS Profile with 8 Queues: The IPQoS profile
configuration determines how many of the VDSL port's queues to use and how to use
them. This table's mapping between the Switch Queues and the IPQoS Profile columns
determines to which VDSL port queue a frame is sent. This is not configurable.
It is highly recommended to use the default IEEE 802.1p to switch queues
mapping and IPQoS profiles with 8 queues.
374
Switch IPQoS Profile
Queues with 1 Queue
2 Q0
0 Q0
1 Q0
3 Q0
4 Q0
5 Q0
6 Q0
7 Q0
IPQoS Profile IPQoS Profile
with 2 Queues with 4 Queues
Q0 Q1
Q0 Q0
Q0 Q0
Q0 Q1
Q1 Q2
Q1 Q2
Q1 Q3
Q1 Q3
MSC1000G/1024G/1224G Series User's Guide
IPQoS Profile
with 8 Queues
Q2
Q0
Q1
Q3
Q4
Q5
Q6
Q7