Enabling and Disabling Diffserv Examination

When a packet arrives at the switch on an ingress port and Diffserv examination is enabled, the switch uses the DSCP value to select the egress QoS (Quality of Service) profile that forwards the packet. The QoS profile configuration defines the forwarding characteristics for all traffic assigned to the QoS profile.

The DiffServ examination feature is disabled by default. To enable DiffServ examination, use the following command:
enable diffserv examination ports [port_list | all]
Note
When DiffServ examination is enabled on 1 Gigabit Ethernet ports for Summit family switches, 802.1p replacement is enabled and cannot be disabled. The ingress 802.1p value is replaced with the 802.1p value assigned to the egress QoS profile.
Note
When DiffServ examination is enabled on a Summit X770, the following warning message does not apply:
```
"Warning: Enabling diffserv examination will cause dot1p replacement of 802.1q tagged packets."
```
To disable DiffServ examination, use the following command:
disable diffserv examination ports [port_list | all]

Published March 2020prev | next

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