Dell Force10 E600i FTOS Version 8.4.1.5 Configuration Guide for ExaScale - Page 902

www.dell.com | support.dell.com VLAN Stacking Packet Drop Precedence c s VLAN Stacking Packet Drop Precedence is available only on platform: The Drop Eligible Indicator (DEI) bit in the S-Tag indicates to a service provider bridge which packets it should prefer to drop when congested. Enable Drop Eligibility You must enable Drop Eligibility globally before you can honor or mark the DEI value. Task Make packets eligible for dropping based on their DEI value. By default, packets are colored green, and DEI is marked 0 on egress. Command Syntax dei enable Command Mode CONFIGURATION When Drop Eligibility is enabled, DEI mapping or marking takes place according to the defaults. In this case, the CFI is affected according to Table 49-3, "Drop Eligibility Behavior," in Service Provider Bridging. Table 49-3. Drop Eligibility Behavior Ingress Normal Port Trunk Port Access Port Egress Normal Port Trunk 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 Honor the Incoming DEI Value To honor the incoming DEI value, you must explicitly map the DEI bit to an FTOS drop precedence; precedence can have one of three colors: Precedence Description Green Yellow Red High priority packets that are the least preferred to be dropped. Lower priority packets that are treated as best-effort. Lowest priority packets that are always dropped (regardless of congestion status). 902 | Service Provider Bridging