Tag Archives: vlan

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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Cisco ASA 5520 – Creating Subinterfaces

5:05 p.m. at the courier’s office. Me and the cabling guys arrive to do the network cutover. We knock on the funny little door where customers pick up their packages. It is a Dutch door, split horizontally at waist-level like a stable door. During business hours, they swing open the upper half of the door, […]

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No Forward Interface Command on the Cisco ASA 5505 with a Base License

The ASA 5505 comes in two flavors: Base License and Security Plus license. Same hardware, but the Security Plus license unlocks more features, such as the number of VLANs that can be configured. License Type and Mode Maximum No. of Active VLANs VLAN Trunking Base License + Transparent Mode 2 active VLANs in 1 bridge […]

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Cisco ASA 5505 – Interface Configuration

The Cisco ASA 5505 is the lowest-end ASA. Small footprint, good price point for SoHo environments. The material differences between the 5505 and its larger brethren are really price, traffic capacity and physical expansion (number of ports, add-on cards etc). Typical scenarios where I’ve deployed 5505 models: Firewall for small businesses that need packet filtering […]

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