Dell C1048P Port Extender Networking Configuration Guide for the C9000 Series - Page 1023

Enabling Drop Eligibility Enable drop eligibility globally before you can honor or mark the DEI value. When you enable drop eligibility, DEI mapping or marking takes place according to the defaults. In this case, the CFI is affected according to the following table. Table 81. Drop Eligibility Behavior Ingress Egress Normal Port Normal Port Trunk Port Trunk Port Access Port Trunk Port DEI Disabled Retain CFI Retain inner tag CFI Retain outer tag CFI Retain inner tag CFI Set outer tag CFI to 0 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 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 a drop precedence value. 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 a drop precedence value. 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. Service Provider Bridging 1023