Administrator Guide

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 EMC 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.
To display the DEI-honoring configuration, use the show interface dei-honor [interface slot/port[/
subport]] in EXEC Privilege mode.
DellEMC#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
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 Honoring the Incoming DEI Value.
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}
To display the DEI-marking configuration, use the show interface dei-mark [interface slot/port[/
subport] ] in EXEC Privilege mode.
DellEMC#show interface dei-mark
Default CFI/DEI Marking: 0
Interface Drop precedence CFI/DEI
--------------------------------
Te 1/1 Green 0
Te 1/1 Yellow 1
Te 2/9 Yellow 0
Te 2/10 Yellow 0
Dynamic Mode CoS for VLAN Stacking
One of the ways to ensure quality of service for customer VLAN-tagged frames is to use the 802.1p priority bits in the tag to
indicate the level of QoS desired.
When an S-Tag is added to incoming customer frames, the 802.1p bits on the S-Tag may be configured statically for each
customer or derived from the C-Tag using Dynamic Mode CoS. Dynamic Mode CoS maps the C-Tag 802.1p value to a S-Tag
802.1p value.
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Service Provider Bridging