Dell Z9000, Configuration Manual

Page: 763 / 968

Table 49. Drop Eligibility Behavior
Ingress Egress DEI Disabled DEI Enabled
Normal Port Normal Port Retain CFI Set CFI to 0.
Trunk Port Trunk Port Retain inner tag CFI Retain inner tag CFI.
Retain outer tag CFI Set outer tag CFI to 0.
Access Port Trunk Port Retain inner tag CFI Retain inner tag CFI
Set outer tag CFI to 0 Set outer tag CFI to 0
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 | linecard number port-set number ]
in EXEC Privilege mode.
Dell#show interface dei-honor
Default Drop precedence: Green
Interface CFI/DEI Drop precedence
---------------------------------------
Te 1/1 0 Green
Te 1/1 1 Yellow
Te 2/9 1 Red
Te 2/10 0 Yellow
Service Provider Bridging
763