Cisco Catalyst SD-WAN Policies Configuration Guide, Releases 26.x and Later

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Default DSCP values

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Lists the default DSCP value used in DSCP control traffic and provides guidance on configuration options and considerations for network service providers.


The DSCP control traffic uses the default DSCP value of 48. However, you can change the default value and configure it on the edge devices. All network service providers may not necessarily use DSCP 48.

The BFD packet having the default DSCP can also be used for other features such as PMTU. A change in the default DSCP means that the other features are affected by the new default DSCP value. Therefore, we recommend that you configure the highest priority DSCP marking that the service provider provides (usually 48, but can be different based on the SLA agreement of the service provider). The color level overrides the global level default DSCP marking.


Configure default DSCP on a Cisco BFD template

Use these steps to configure the default DSCP value on a Cisco BFD template, ensuring that BFD packets are marked appropriately for traffic prioritization and quality of service.

Procedure

1.

From the Cisco SD-WAN Manager menu, selectConfiguration > Templates > Feature Templates > .

Note

In Cisco vManage Release 20.7.x and earlier releases, Feature Templates is titled Feature.

2.

Click Add Template and select a device from the device list in the left pane.

3.

In the right pane, select the BFD template listed under Basic Information.

Enter Template Name and Description in the respective fields.

4.

In the Basic Configuration pane, enter Multiplier and Poll Interval (milliseconds).

5.

In the Default DSCP value for BFD Packets field, enter the required device specific value or choose the default value for DSCP.

6.

(Optional) In the Color pane, choose the required color from the drop-down list.

7.

Enter the required Hello Interval (milliseconds) and Multiplier.

8.

Choose the Path MTU Discovery value.

9.

Enter the BFD Default DSCP value for tloc color.

10.

Click Add.

The default DSCP and color values are configured on the BFD template.