Tag Archives: ethernet

Cisco ASA – 802.1q VLAN Tagging

The Cisco ASA supports 802.1q tagging, which inserts a tag into the original Ethernet frame. The 802.1q tag contains 4 fields: TPID (Tag Protocol Identifier) 16-bit field. A value of 0x8100 identifies the frame as an IEEE 802.1q-tagged frame. Priority 3-bit field describing the frame priority level. Value can range from 0 to 7. CFI […]

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