Viewing DSCP mapping

The following sections describe egress mapping. DSCP mapping configurations apply to egress for trusted QoS interfaces.

DSCP mapping tab navigation

Viewing egress mapping using EDM

Use the following procedure to view egress mapping using EDM.

Procedure steps
Step Action
1

From the navigation tree, double-click QoS.
2

In the QoS tree, double-click QoS Devices.
3

In the work area, click the DSCP Mapping tab.
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Variable definitions

Use the data in the following table to help you understand egress mapping.

DSCP Mapping tab parameters

Variable Value
Dscp Indicates the DSCP value. This is a read-only cell.
802.1pPriority Specifies the user priority value associated with the DSCP. Values range from 0–7.
DropPrecedence Specifies the relative drop precedence value for mapping the DSCP value to a drop precedence. Values include:
  • lowDropPrec
  • highDropPrec
When network congestion occurs, the system drops packets with a high drop precedence before those with a low drop precedence.

NewDscp

 Specifies a new DSCP value to use when DSCP mutation is required. Values range from 0–63.
ServiceClass Specifies the type of service. Value is a character string with a maximum of 16 characters.

Configuring egress mapping using EDM

Use the following procedure to configure DSCP-to-802.1p priority and drop precedence associations that are used for assigning these values at packet egress, based on the DSCP in the received packet.

Prerequisites

Procedure steps
Step Action
1

From the navigation tree, double-click QoS.
2

In the QoS tree, double-click QoS Devices.
3

In the work area, click the DSCP Mapping tab.
4

To select a DSCP map to edit, click a Dscp row.
5

In the Dscp row, double-click the cell in the 802.1pPriority column.
6

From the list, select a value.
7

In the Dscp row, double-click the cell in the DropPrecedence column.
8

From the list, select a value.
9

In the Dscp row, double-click the cell in the NewDscp column.
10

In the cell, type a value.
11

In the Dscp row, double-click the cell in the ServiceClass column.
12

In the cell, type a character string.
13

On the toolbar, click Apply.
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