Allied Telesis AT-S63 User Manual
Page 318
Chapter 15: Class of Service
318
Section II: Advanced Operations
In this example, the port transmits a maximum number of 15 packets from
Q7 before moving to Q6, from where it transmits up to 10 packets, and so
forth.
For Q0 to Q6, the range of the maximum number of transmitted packets is
1 to 15. The range for Q7, the highest priority queue, is 0 to 15. Setting Q7
to 0 means its packets always take priority over the packets in the other
queues and that no packets are transmitted from the lower priority queues
so long as there are packets in Q7. This allows you to combine the two
priority scheduling methods on the same port.
An example.of Q7 with a weight of 0 is shown in Table 13. At these
settings, a port transmits all of the packets from Q7 until the queue is
empty, and then transmits a maximum of 15 packets from Q6, 8 packets
from Q5, and so forth.
Q5
5
Q6
10
Q7
15
Table 13. Example of a Weight of Zero for Priority Queue 7
Port Egress Queue
Maximum Number of
Packets
Q0 (lowest)
1
Q1
1
Q2
8
Q3
8
Q4
8
Q5
8
Q6
15
Q7
0
Table 12. Example of Weighted Round Robin Priority (Continued)
Port Egress Queue
Maximum Number of
Packets