White Papers

• Assign each queue a bandwidth percentage ranging from 1 to 100%, in increments of 1%.
bandwidth-percentage
Allocating Memory in the Dynamic Buer Pool for a Specic Trac
You can restrict any class of trac from utilizing the available bandwidth to a dened limit. Restricting a trac to a certain level ensures
that when the particular class of trac uses more than certain bandwidth during congestion, the system drops the trac. This ensures the
latency of the trac is not aected.
To restrict a trac from utilizing the available bandwidth to a dened limit, allocate the memory for that trac from the dynamic buer
pool. To dene the memory, follow these steps:
1 Create a QOS policy output.
qos-policy-output qos-output-policy-name
2 Dene the bandwidth percentage.
bandwidth-percentage percentage
3 Congure the rate shape.
rate-shape value committed value
4 Dene the memory from the dynamic buer pool for a class of trac.
dynamic-buffer-limit buffer-limit
The range is from 0 to 12288.
Specifying WRED Drop Precedence
You can congure the WRED drop precedence in an output QoS policy.
• Specify a WRED prole to yellow and/or green trac.
QOS-POLICY-OUT mode
wred
For more information, refer to Applying a WRED Prole to Trac.
DSCP Color Maps
This section describes how to congure color maps and how to display the color map and color map conguration.
This sections consists of the following topics:
• Creating a DSCP Color Map
• Displaying Color Maps
• Display Color Map Conguration
Creating a DSCP Color Map
You can create a DSCP color map to outline the dierentiated services codepoint (DSCP) mappings to the appropriate color mapping
(green, yellow, red) for the input trac. The system uses this information to classify input trac on an interface based on the DSCP value
of each packet and assigns it an initial drop precedence of green, yellow, or red
The default setting for each DSCP value (0-63) is green (low drop precedence). The DSCP color map allows you to set the number of
specic DSCP values to yellow or red. Trac marked as yellow delivers trac to the egress interface, which will either transmit or drop the
packet based on congured queuing behavior. Trac marked as red (high drop precedence) is dropped.
Important Points to Remember
Quality of Service (QoS)
719