830 | Service Provider Bridgingw w w . d e l l . c o m | s u p p o r t . d e l l . c o m Table 40-2 details the outcome of matched and mismatched TPIDs in a VLAN-stacking network with theC-Series and S-Series.VLAN Stacking Packet Drop PrecedenceVLAN Stacking Packet Drop Precedence is available only on platform: c s zThe Drop Eligible Indicator (DEI) bit in the S-Tag indicates to a service provider bridge which packets itshould prefer to drop when congested.Table 40-2. C-Series and S-Series Behaviors for Mis-matched TPIDNetworkPositionIncomingPacket TPIDSystemTPID Match Type Pre-8.2.1.0 8.2.1.0+Ingress Access Point untagged 0xUVWX — switch to defaultVLANswitch to defaultVLANsingle-tag (0x8100) 0xUVWX single-tagmismatchswitch to defaultVLANswitch to defaultVLAN0x8100 single-tag match switch to VLAN switch to VLAN0x81XY single-tag first-bytematchswitch to VLAN switch to defaultVLANCore untagged 0xUVWX — switch to defaultVLANswitch to defaultVLANdouble-tag0xUVWX0xUVWX double-tag match switch to VLAN switch to VLAN0xUVYZ double-tagfirst-byte matchswitch to VLAN switch to defaultVLAN0xQRST double-tagmismatchswitch to defaultVLANswitch to defaultVLANEgress Access Point untagged 0xUVWX — switch to defaultVLANswitch to defaultVLANdouble-tag0xUVWX0xUVWX double-tag match switch to VLAN switch to VLAN0xUVYZ double-tagfirst-byte matchswitch to VLAN switch to defaultVLAN0xQRST double-tagmismatchswitch to defaultVLANswitch to defaultVLAN
