Marking Egress Packets with a DEI ValueOn 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 modedei mark {green | yellow} {0 | 1}Example of Viewing DEI-Marking ConfigurationTo display the DEI-marking configuration, use the show interface dei-mark [interface slot/port/subport | linecard number port-set number] in EXEC Privilege mode.Dell#show interface dei-markDefault CFI/DEI Marking: 0Interface Drop precedence CFI/DEI--------------------------------Te 1/1/1 Green 0Te 1/1/1 Yellow 1Te 2/9/1 Yellow 0Te 2/10/1 Yellow 0Dynamic Mode CoS for VLAN StackingOne of the ways to ensure quality of service for customer VLAN-tagged frames is to use the 802.1ppriority 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 configuredstatically for each customer or derived from the C-Tag using Dynamic Mode CoS. Dynamic Mode CoSmaps the C-Tag 802.1p value to a S-Tag 802.1p value.Figure 113. Statically and Dynamically Assigned dot1p for VLAN StackingWhen configuring Dynamic Mode CoS, you have two options:• Mark the S-Tag dot1p and queue the frame according to the original C-Tag dot1p. In this case, youmust have other dot1p QoS configurations; this option is classic dot1p marking.822 Service Provider Bridging
