L3 Network Engineer Job Description

Role Summary:
Responsible for advanced troubleshooting, design, implementation, and support of enterprise and data center networks. Acts as final escalation point and supports critical incidents, new deployments, and network optimization.

Key Responsibilities

- Act as final escalation (L3) for complex LAN/WAN, WLAN, VPN, and Data Center issues.
- Handle P1/P2 incidents, perform deep packet analysis, and create RCA.
- Design and implement network solutions; contribute to HLD/LLD.
- Deploy and support BGP, OSPF, EIGRP, ISIS, MPLS, VXLAN/EVPN.
- Implement and maintain configurations for routers, switches, firewalls, and load balancers.
- Configure and troubleshoot firewalls, IPSec/SSL VPNs, IDS/IPS, and security policies.
- Perform performance optimization, QoS tuning, and capacity planning.
- Support network upgrades, migrations, and new site rollouts.




- Prepare and execute change requests with risk and rollback plans (ITIL aligned).
- Coordinate with OEM TAC teams and ISPs for escalations and new links.
- Maintain documentation, network diagrams, SOPs, and mentor L1/L2 teams.
- Experience with copper and fiber cabling.
- Troubleshoot physical layer issues and maintain asbuilt cabling documentation.
- Support data center expansions and recent site deployments.

Required Skills

- Routing: BGP, OSPF, EIGRP, ISIS
- Switching: STP, VLAN, VTP, ACL, EtherChannel, VXLAN/EVPN
- Security: Firewalls, VPN (IPSec/SSL), IDS/IPS
- Wireless: WLAN Controllers, AP design basics
- Load Balancers: F5 / A10
- OEMs: Cisco, H3C, Aruba, Palo Alto, Fortinet, Check Point, Extreme, SDWAN
- Tools: Packet capture and traffic analysis tools

📌 Network Engineer 3 (Chennai)
🏢 Primus Global Technologies
📍 Chennai