Marcus Harrison — Network Engineer

Marcus Harrison — Network Engineer
Available for consulting

Marcus
———
NetEng.

Network Engineer & Team Lead · Brooklyn, NY
Brooklyn, New York
Wyckoff Heights Medical Center
✓ CCNA
▶ CCNP Security – SCOR
○ SNCF
○ CCIE Security
904 Static Routes Migrated
210 Switches Automated
38 WLC CPU ACL Rules
7 Devices in OSPF Overhaul
BigLeaf
SD-WAN
Dual ISP HA
FTD 4110
→ 4215
HA Firewall
Core L3
Switches
OSPF Migration
WLC
NY-WYCKOFF
CPU ACL v2
NPS / MDM
EAP-TLS
802.1X
RapidAI
Cluster
3-Node On-Prem
Network Engineer & Team Lead
2022 – Present
Wyckoff Heights Medical Center · Brooklyn, NY
  • Sole network engineer — owns routing infrastructure, wireless, security, and automation end-to-end for a full-scale hospital environment
  • OSPF Migration: Architecting a 904 static-route overhaul across 7 devices into a full OSPF domain (Phases 0–2), with transit VLAN 196 and conflict-resolution across biomedical systems (HILLROM)
  • Firewall: Managing Cisco Firepower/FTD environment; leading procurement of FTD 4215 HA pair upgrade; authored 60-hour ACL optimization scope covering 627 existing rules
  • WLC Security: Deployed CPU-ACL-V2 (38 rules) on NY-WYCKOFF-WLC-1 protecting the wireless LAN controller control plane from unauthorized access
  • Network Automation: Built Netmiko-based serial collection, TAC documentation, and parallel ACL modification scripts targeting ~210 switches; integrated Claude Code + CML via MCP on Ubuntu 24.04 automation VM
  • HIPAA Compliance: Maintains security posture across Firepower and Checkpoint; conducted vendor evaluation producing CIO-ready recommendations
  • SD-WAN: Deployed Avaya SBC + BigLeaf dual-ISP HA solution; documented VLAN topology (850, 995–998) and managed change control lifecycle
  • Zero Trust / PKI: Configured NDES/SCEP static passwords for MDM integration; resolved EAP-TLS auth failures across WLC + NPS + Samsung MDM stack; leading SSL certificate deployment for guestwifi.wyckoffhospital.org
  • Clinical Systems: Onboarded RapidAI 3-node on-prem cluster (VIP 10.204.50.45) with SSL bypass and URL whitelisting; integrated Trend Micro Vision One data ingestion framework
  • Built and owns WHMC’s Change Management process including a 10-section fillable PDF change control form with 5-approver workflow
🔀
Static → OSPF Migration
Eliminating 904 static routes across 7 devices. Full 3-phase project plan with Excel routing overview, VLAN 196 transit design, and vendor timeline deconfliction.
OSPFRouting10-sheet Excel
🛡️
WLC CPU ACL V2
Designed and deployed 38-rule ACL on NY-WYCKOFF-WLC-1 to protect the controller control plane. Catch-all permit→deny change pending maintenance window.
Cisco WLCSecurityACL
🔥
FTD 4215 HA Upgrade
Led procurement and vendor evaluation for Firepower 4110→4215 HA pair. Authored CIO-ready Word doc recommending Driven Tech; includes 60-hr ACP optimization scope.
FirepowerFTD 7.6HA
🤖
NetDevOps Automation
Python automation suite: parallel ACL deployment to ~210 switches, serial inventory harvester with fallback parsing, TAC doc collector. Claude Code + CML MCP integration on Ubuntu VM.
NetmikoPythonCML MCP
🌐
BigLeaf SD-WAN HA
Dual-ISP failover with Avaya SBC integration. Documented switch port topology across VLANs 850, 995–998. Active monitoring of primary ISP flapping with validated failover.
SD-WANAvaya SBCHA
🧠
RapidAI Cluster Onboarding
Deployed 3-node on-prem AI inference cluster (VIP .50.45) with hybrid cloud architecture. Configured SSL bypass and URL whitelisting on FTD for clinical AI workloads.
FTDSSL BypassHIPAA
📋
Change Management Overhaul
Built WHMC’s change control process from scratch — 10-section fillable PDF, 5-approver workflow (Systems, Helpdesk, Network, CIO), and supporting documentation framework.
GovernanceITILHIPAA
🔑
EAP-TLS / NDES / SCEP
Resolved 802.1X auth failures across WLC + NPS + Samsung MDM stack. Configured NDES/SCEP static password for certificate-based MDM enrollment.
802.1XPKIMDM
Routing & Switching
OSPFBGPSTPVLANsL3 DesignStatic Routing
Security
Cisco Firepower/FTDCheckpointACL802.1XEAP-TLSHIPAA
Wireless
Cisco WLCEkahauSSID DesignRF SurveyingNPS
Automation
PythonNetmikoNAPALMNornirAnsibleClaude Code
Infrastructure
ProxmoxCMLUbuntuWSL2SD-WANPKI/NDES
PKM & Documentation
ObsidianOneNoteTodoistGitHubZettelkasten
NETWIT
Learn, Do, Teach! — Healthcare network engineering in public
→ net-wit.com