Vlan Stacking Packet Drop Precedence; Enabling Drop Eligibility - Dell S6100 Configuration Manual

Figure 117. Single and Double-Tag TPID Mismatch

VLAN Stacking Packet Drop Precedence

VLAN stacking packet-drop precedence is supported on the switch.
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.
Service Provider Bridging 803