Honoring The Incoming Dei Value; Marking Egress Packets With A Dei Value - Dell Z9500 Configuration Manual

Table 77. Drop Eligibility Behavior
Ingress
Normal Port
Trunk Port
Access Port
To enable drop eligibility globally, use the following command.
• Make packets eligible for dropping based on their DEI value.
CONFIGURATION mode
dei enable
By default, packets are colored green, and DEI is marked 0 on egress.

Honoring the Incoming DEI Value

To honor the incoming DEI value, you must explicitly map the DEI bit to an Dell Networking OS drop precedence.
Precedence can have one of three colors.
Precedence Description
Green High-priority packets that are the least preferred to be dropped.
Yellow Lower-priority packets that are treated as best-effort.
Red Lowest-priority packets that are always dropped (regardless of congestion status).
• Honor the incoming DEI value by mapping it to an Dell Networking OS drop precedence.
INTERFACE mode
dei honor {0 | 1} {green | red | yellow}
You may enter the command once for 0 and once for 1.
Packets with an unmapped DEI value are colored green.
Example of Viewing DEI-Honoring Configuration
To display the DEI-honoring configuration, use the show interface dei-honor [interface slot/port] in EXEC
Privilege mode.

Marking Egress Packets with a DEI Value

On egress, you can set the DEI value according to a different mapping than ingress.
For ingress information, refer to
To mark egress packets, use the following command.
• Set the DEI value on egress according to the color currently assigned to the packet.
INTERFACE mode
dei mark {green | yellow} {0 | 1}
Egress
Normal Port
Trunk Port
Trunk Port
Honoring the Incoming DEI
DEI Disabled
Retain CFI
Retain inner tag CFI
Retain outer tag CFI
Retain inner tag CFI
Set outer tag CFI to 0
Value.
DEI Enabled
Set CFI to 0.
Retain inner tag CFI.
Set outer tag CFI to 0.
Retain inner tag CFI
Set outer tag CFI to 0
Service Provider Bridging 764