Tag Archives: ASA

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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Cisco ASA 5520 – Basic Interface Configuration

The Cisco ASA 5520 is one of the mid-range ASAs. 4 Gigabit Ethernet ports. Max 450 Mbps throughput under ideal conditions. Good for mid-sized offices. Has an expansion slot where you can install an add-on card that does content filtering (e.g. email and web) or intrusion prevention. Or you can install an expansion card that […]

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Cisco ASA – Administrative Distance and Metric

Family Christmas dinner at my oldest customer’s house. The experience is what you’d expect if George Carlin incorporated Gosford Park into one of his standup routines. Posh yet subversive. All the guests are aging counter-culture types. Hippies who run eco-friendly business empires. Artists who made it big with corporate patrons. Telling shaggy dog stories that […]

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Cisco ASA – More Static Route Tracking (SLA Monitoring)

Static route tracking (a.k.a SLA monitoring) is a simple method that the Cisco ASA uses to track the availability of a static route. It allows the Cisco ASA to remove static routes from its routing table if it thinks that the routes are not available. The Cisco ASA monitors the “reachability” of an IP address […]

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