Composite Operation Example; Dscp Table - Avaya G250 Administration

Configuring policy

Composite operation example

The following commands create a new composite operation called dscp5 and assign the new
composite operation to rule 3 in QoS list 402. If the packet matches a rule, the G250/G350
changes the value of the DSCP field in the packet to 5.
G350-001# ip qos-list 402
G350-001(QoS 402)# composite-operation 12
G350-001(QoS 402/cot 12)# name dscp5
Done!
G350-001(QoS 402/cot 12)# dscp 5
Done!
G350-001(QoS 402/cot 12)# cos no-change
Done!
G350-001(QoS 402/cot 12)# exit
G350-001(QoS 402)# ip-rule 3
G350-001(QoS 402/rule 3)# composite-operation dscp5
Done!

DSCP table

DSCP is a standards-defined method for determining packet priority through an interface, either
into or out of a router.
There are three ways you can use the DSCP field:
Classifier — Select a packet based on the contents of some portions of the packet header
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and apply behavioral policies based on service characteristic defined by the DSCP value.
Marker — Set the DSCP field based on the traffic profile, as determined by the defined
●
rules.
Metering — Check compliance to traffic profile using filtering functions.
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A DSCP value can be mapped to a Class of Service (CoS). Then, for a CoS, rules can be
applied to determine priority behavior for packets meeting the criteria for the entire CoS.
Multiple DSCP values can be mapped to a single CoS. Rules can also be applied to individual
DSCP values.
The default value of DSCP in a packet is 0, which is defined as "best-effort." You can determine
a higher priority for a traffic type by changing the DSCP value of the packet using a QoS rule or
composite operation.
Each QoS list includes a DSCP table. A DSCP lists each possible DSCP value, from 0 to 63.
For each value, the list specifies a composite operation. See
operations for QoS lists
460 Administration for the Avaya G250 and Avaya G350 Media Gateways
on page 458.
Pre-configured composite