Amer Networks E5Web GUI - Manual (Page 665)

Figure 10.3. Differentiated Limits Using Chains
If surfing uses the full limit of 125 Kbps, those 125 Kbps will occupy half of the std-in pipe leaving
125 Kbps for the rest of the traffic. If no surfing is taking place then all of the 250 Kbps allowed
through std-in will be available for other traffic.
This does not provide a bandwidth guarantee for web browsing but instead limits it to 125 Kbps
and provides a 125 Kbps guarantee for everything else. For web browsing the normal rules of
first-come, first-forwarded will apply when competing for the 125 Kbps bandwidth. This may
mean 125 Kbps, but it may also mean much slower speed if the connection is flooded.
Setting up pipes in this way only puts limits on the maximum values for certain traffic types. It
does not give priorities to different types of competing traffic.
10.1.6. Precedences
The Default Precedence is Zero
All packets that pass through cOS Core traffic shaping pipes have a Precedence. In the examples
so far, precedences have not been explicitly set and so all packets have had the same default
precedence which is 0.
There are 8 Possible Precedence Levels
Eight precedences exist which are numbered from 0 to 7. Precedence 0 is the least important
(lowest priority) precedence and 7 is the most important (highest priority) precedence. A
precedence can be viewed as a separate traffic queue; traffic in precedence 2 will be forwarded
before traffic in precedence 0, precedence 4 forwarded before 2.
Chapter 10: Traffic Management
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