Example
The following table shows an example of a scheduler table:
Queue Queue scheduling method Weight Normalized weight
1 Weighted bandwidth 5 50%
2 Strict priority 9 1
3 Weighted bandwidth 5 50%
4 Strict priority 15 2
The strict priority queues are served before the weighted bandwidth queues. The strict
priority queue with the highest weight is served first, queue 4 in this example.
In this example, after serving the strict priority queues 4 and 2, the remaining
bandwidth is evenly divided over queues 1 and 3.
Depending on the mode of operation, queue 3 or queue 4 is used for network
management traffic, for instance for the spanning tree protocol (see “Traffic class to
queue assignment” (p. 11-61)). Hindering this traffic can influence Ethernet network
stability.
Default settings
These are the default settings of the queue scheduling method and weight:
Queue Queue scheduling method Weight
1 Strict priority 1
2 Strict priority 2
3 Strict priority 3
4 Strict priority 239
Note: To ensure network stability (internal (r)STP BPDUs must arrive), queue 4 is
served with strict priority scheduling with a fixed priority of 239.
Ethernet Overview
Classification, queueing and scheduling
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365-312-801R7.2
Issue 3, May 2007
Alcatel-Lucent - Proprietary
See notice on first page
11-63
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