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Table 59: Configuring Code Point Aliases
Task
Assign an alias to the dscp code
point.
Related
Documentation
Configuring CoS Drop Profile (NSM Procedure)
Copyright © 2010, Juniper Networks, Inc.
Action
1.
In the Configuration tree, expand Code Point Aliases.
2. Select Dscp.
3. Click the Add New icon.
4. In the Name box, type the alias that you want to assign to the code point—for example,
my1.
5. In the Bits box, type the code point—for example, 110001.
6. Click OK.
Configuring CoS Classifiers (NSM Procedure) on page 124
Configuring CoS Drop Profile (NSM Procedure) on page 127
Configuring CoS Forwarding Classes (NSM Procedure) on page 129
Configuring CoS Interfaces (NSM Procedure) on page 134
Configuring CoS Rewrite Rules (NSM Procedure)
Configuring CoS Schedulers (NSM Procedure) on page 141
Configuring CoS and Applying Scheduler Maps (NSM Procedure) on page 143
Drop profiles provide a congestion management mechanism that enables a switch or
routing platform to drop the arriving packets when queue buffers become full or begin
to overflow. Drop profiles define the meanings of loss priorities. When you configure drop
profiles you are essentially setting the value for queue fullness. The queue fullness
represents the percentage of the memory used to store packets in relation to the total
amount of memory that has been allocated for that specific queue. The queue fullness
defines the delay-buffer bandwidth, which provides packet buffer space to absorb burst
traffic up to the specified duration of delay. Once the specified delay buffer becomes
full, packets with 100 percent drop probability are dropped from the tail of the buffer.
You specify drop probabilities in the drop profile section of the CoS configuration hierarchy
and reference them in each scheduler configuration. By default, if you do not configure
any drop profile then the drop profile that is in effect functions as the primary mechanism
for managing congestion. In the default tail drop profile, when the fill level is 0 percent,
the drop probability is 0 percent. When the fill level is 100 percent, the drop probability
is 100 percent.
To configure drop profiles in NSM:
In the navigation tree, select Device Manager > Devices.
1.
Click the Device Tree tab, and then double-click the device for which you want to
2.
configure drop profiles.
Chapter 13: Configuring Class of Service Features
127
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