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450 Nokia Network Voyager for IPSO 4.0 Reference Guide
by adding delay to packets that must wait for more tokens to arrive in the bucket. When more
bursts arrive than can be accommodated by the shaping queue, then that traffic is dropped. Both
outgoing and incoming traffic streams can be shaped.
To configure a shaper, see “Configuring ACL Rules” on page 452. Select shape as the action for
one or more rules. See “To create an Aggregation Class” on page 456 for information about
creating AGC meters. You should associate the AGC with the shaping rule(s) of the ACL.
Traffic Queuing Description
Traffic that is classified by an Access Control List (ACL) rule can be given preferential
treatment according to RFC 2598. Higher-priority traffic must be policed to prevent starvation of
lower-priority service traffic. Traffic that conforms to the configured policing rate is marked
with the Differentiated Services Codepoint (DSCP). When such traffic is processed by the
output queue scheduler, it receives favorable priority treatment.
Some traffic is generated by networking protocols. This traffic should be given the highest
queuing priority; otherwise, the link may become unstable. For this reason, the Queue Class
(QC) configuration provides an internetwork control queue by default; some locally sourced
traffic is prioritized to use that queue.
Prioritization is only relevant for outgoing traffic. Incoming traffic is never prioritized.
Use the DSfield in the Access Control List (ACL) to set the value for marking traffic that
matches a given ACL rule. The QueueSpec is used to map a flow with the output queue.
To configure EF, see “Configuring ACL Rules” on page 452 for information about creating ACL
rules. Choose prioritize as the action for one or more rules. Enter the appropriate values in the
DSfield and QueueSpec edit boxes. See “To create an Aggregation Class” for information about
creating Aggregation Class meters. You should associate the AGC with the prioritize rule(s) of
the ACL.
Configuring Access Control Lists
To set up an Access Control List (ACL), you must configure the interface(s) with which you
want to associate the ACL and the Bypass option. To configure an interface, see “To apply or
remove an ACL to or from an interface”.
The Bypass option denotes that the entire packet stream flowing out of the selected interfaces
should not be classified, policed, or marked. Instead, the output queue scheduler should use the
supplied IP TOS as an output queue lookup. Use the Bypass option to circumvent the classifier
and policer for selected interfaces.