Charith D.

Senior Network Engineer | Cisco Catalyst, Meraki & Aruba Central | Firewall Migrations (FortiGate, SonicWall, Sophos) | [15+ Years Enterprise Experience Need your network designed, migrated, or fixed without downtime? I help businesses build reliable, secure, and well-documented networks, from a single branch office to multi-site enterprise environments. WHAT I CAN DO FOR YOU ✔ Cisco Enterprise Switching Configuration, upgrades, and troubleshooting of Cisco Catalyst 9500, 9300, and 9200 series switches: VLANs, trunking, EtherChannel, StackWise, SVIs, ACLs, QoS, 802.1X, and routing (OSPF, EIGRP, BGP). ✔ Cloud & Controller-Based Network Management - Cisco Catalyst Center (DNA Center): device onboarding, templates, provisioning, assurance, and SWIM upgrades - Cisco Meraki: MS switches, MR wireless, and MX security appliances, including site-to-site VPN and dashboard management - Aruba Central: switch and AP onboarding, configuration groups, templates, and monitoring ✔ Firewall Configuration & Migration FortiGate, SonicWall, and Sophos: policy design, NAT, IPsec/SSL VPN, HA, security profiles, and vendor-to-vendor migrations with careful rule review and minimal downtime. ✔ HPE Aruba Switching 8200zl, 5400R, 3800, 2930F, 2600, 2500: VSF, IRF, stacking, VRRP, LACP, port security, DHCP server/relay, 802.1X, QoS, SNMP. ✔ Storage Networking Brocade SAN switch migrations: zoning, fabric planning, and cutover with data-path continuity. ✔ Routing, WAN & Wireless Cisco routers (ISR 4000/3800/2800 series) and Cisco 9800 Wireless LAN Controllers. LAN/WAN integration, DR site connectivity, MPLS, IS-IS, VRRP, and BGP. ✔ Unified Communications Avaya Aura (SMGR, CM, SM, SBC, Utility Services, Device Services), Avaya IP Office, and Cisco CUCM. ✔ Documentation HLD and LLD documents, migration plans, handover documents, operations and maintenance guides, and training material. WHY WORK WITH ME - Real enterprise experience across multiple vendors, so I see the whole picture - Clear communication and regular progress updates - Change plans with rollback steps before any production work - Clean, professional documentation delivered with every project - Flexible with time zones for maintenance windows Have a project in mind? Send me a message with your current setup and goals, and I'll reply with a clear plan of how I can help.