Inalp Networks SmartWare Release 2.10, Software Configuration Manual

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124 Link Scheduler Configuration
Figure 15-8: DS Field Structure
In a DSCP value notation 'xxxxxx' (where 'x' may equal '0' or '1') used in this user guide, the left-most
bit signifies bit 0 of the DS field (as shown above), and the right-most bit signifies bit 5.
The DSCP field within the DS field is capable of conveying 64 distinct codepoints. The codepoint
space is divided into three pools for the purpose of codepoint assignment and management: a pool of
32 recommended codepoints (Pool 1) to be assigned by Standards Action, a pool of 16 codepoints
(Pool 2) to be reserved for experimental or local use (EXP/LU), and a pool of 16 codepoints (Pool 3)
which are initially available for experimental or local use, but which should be preferentially utilized
for standardized assignments if Pool 1 is ever exhausted. The pools are defined in the Table 15-3
(where 'x' refers to either '0' or '1'):
Pool Codepoint Space Assignment Policy
1 xxxxx0 Standards Action
2 xxxx11 EXP/LU
3 xxxx01 EXP/LU (*)
Table 15-3: Codepoint Pools
(*) may be utilized for future Standards Action allocations as necessary
Service providers are not required to use the same node mechanisms or configurations to enable
service differentiation within their networks, and are free to configure the node parameters in
whatever way that is appropriate for their service offerings and traffic engineering objectives. Over
time certain common per-hop behaviors are likely to evolve (i.e. ones that are particularly useful for
implementing end-to-end services) and these may be associated with particular EXP/LU PHB
codepoints in the DS field, allowing use across domain boundaries. These PHBs are candidates for
future standardization.
Note: If you have to configure service differentiation on your SmartNode, ensure to that codepoint
settings are arranged with your service provider.
The command
set ip dscp sets the DS field applied to packets of the class name . Shaping may be
applied to make the class conformant. The no form of this command disables packet marking.
Procedure
Defining the codepoints in the DS field
Mode
Source
Software Configuration Guide Release 2.10, Revision 1.00