DELL S6000-ON User Manual

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Figure 107. Single and Double-Tag TPID Mismatch
VLAN Stacking Packet Drop Precedence
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.
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.
848
Service Provider Bridging