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Nokia Network Voyager for IPSO 4.0 Reference Guide 455
Configuring Aggregation Classes
An Aggregation Class (AGC) is used to determine whether the traffic stream meets certain
throughput goals. Traffic that meets these goals is conformant; traffic that does not meet these
goals is non-conformant. Depending on the configuration of the classifier rules, non-conformant
traffic may be delayed, policed, that is dropped, or marked. An Aggregation Class groups traffic
from distinct rules and measures its throughput.
You can configure an Aggregation Class with two parameters:
Mean Rate—The rate, in kilobits per second (kbps), to which the traffic rate should be coerced
when measured over a long interval.
Burst Size—The maximum number of bytes that can be transmitted over a short interval.
When you initially create an AGC, a burst of traffic is conformant—regardless of how quickly it
arrives—until the size of the burst (in bytes) is equal to or larger than the burstsize you
configured for the AGC. When the burst reaches the configured burstsize, traffic is non-
conformant, but the AGC increases the rate at which traffic is transmitted based on the
configured meanrate. Traffic that arrives consistently at a rate less than or equal to the
configured meanrate will always be marked conformant and will not be delayed or dropped in
the respective shaper or policer stages.
DSfield
Specifies the DiffServ codepoint with which to mark traffic which matches this rule.
RFC 791 states that the least significant two bits of the DiffServ codepoint are unused. Thus,
the least significant two bits for any value of the DSfield that you enter in the ACL rule will be
reset to 0. For example, if you enter 0xA3, it will be reset to 0xA0 and the corresponding
packets will be marked as 0xA0 and not 0xA3.
The DSfield and QueueSpec field can be configured only when the rule’s action is set to
"prioritize."
Logical Queue Specifier
(QueueSpec)
Specifies the logical queue specifier value to be used by the output scheduler for traffic
matching this rule.
Range: None or 0-7
Default: None
The DSfield and QueueSpec field can be configured only when the rule’s action is set to
"prioritize."
When the DSfield is set to one of the predefined codepoints, for example, Internetwork
Control, EF, or best effort, then the QueueSpec field is not used.
Aggregation Class See “To associate an aggregation class with a rule” on page 456.
Table 27 ACL Rule Attributes
Attribute Description