Stage 01 · The Edge
A redundant WAN handoff.
Traffic enters from the ISP through a pair of WAN switches sharing the handoff. Either switch can carry the link, so the connection never depends on a single box.
WAN A / WAN BAutomatic failover
SLS Engineering · Florida
Strategic. Logical. Solutions.
Tech solutions, designed — IT consulting, AI consulting, and network solutions.
Follow the packet
A high-availability topology, layer by layer.
Stage 02 · Gateway & Firewall
Active / standby gateways.
Both WAN switches feed both gateways, but traffic only flows through the primary. The standby holds an identical config and takes over in seconds if the primary drops (VRRP).
VRRPActive / standbyFirewall + VLANs
Stage 03 · The Core
Two switches, one logical core.
The aggregation pair is joined by a peer-link and forwards as a single core (MC-LAG). Both gateways cross-connect to both cores, so losing either switch doesn't stop traffic.
MC-LAGPeer-linkCross-connects
Stage 04 · The Access Layer
Every device is dual-homed.
Each device — Wi-Fi, cameras, door locks, doorbell — takes a primary uplink to one core and keeps a standby path (amber) to the other. Any single link can fail without dropping the device.
Dual-homedPrimary + standbyPoE
Stage 05 · The Endpoint
Every path converges.
All branches lead back to the people using the network. Between here and the internet, no single cable, switch, or gateway failure breaks the path.
0 single points of failure
What I do
From consulting to cabling.
IT Consulting
Direction, setup, security, and stubborn problems — sensible IT decisions, explained in plain language.
AI Consulting
Practical AI tools and automation — assistants, document workflows, and the busywork handled — where they actually earn their keep.
Network Solutions
Design and install, end to end — Wi-Fi coverage, structured cabling, and the full Ubiquiti UniFi ecosystem, engineered like the diagram above.
About
SLS Engineering.
Strategic Logical Solutions — established by Sean for IT consulting, AI consulting, and network solutions. Based in Florida.
Sean's background spans IT, project management, and network infrastructure design — including low-voltage and network build-outs for new building construction, from the first blueprint walkthrough to the final labeled rack.