Network Engineer Sd-Wan

SUMMARY

KRISHNA CHARAN VALLABHANENI

Email: *************************@*****.*** Phone: +1-417-***-**** Network Engineer with 3+ years of experience in designing, configuring, and troubleshooting LAN, WAN, and SD-WAN infrastructures. Proficient in routing and switching protocols (BGP, OSPF, EIGRP), VPN technologies (IPSec, SSL), and firewall management (Palo Alto, Cisco ASA, Fortinet). Skilled in Cisco Catalyst and Nexus platforms, with hands-on experience in Juniper and Aruba devices. Experienced in network automation using Python and Ansible for repetitive task optimization. Well-versed in cloud networking components across AWS and Azure, including VPCs, Route 53, Transit Gateway, and ExpressRoute. Strong problem-solving skills with a focus on uptime, performance, and security in enterprise environments.

TECHNICAL SKILLS

Networking Protocols: TCP/IP, DNS, DHCP, NAT, ICMP, ARP, VLAN, STP, EtherChannel

Routing & Switching: OSPF, EIGRP, BGP, Static Routing, VRF, Inter-VLAN Routing

Enterprise Networking: LAN, WAN, WLAN, SD-WAN (Cisco, Meraki), MPLS, VPN

Firewall & Security: Palo Alto, Cisco ASA, Fortinet, ACLs, IPSec VPN, SSL VPN, 802.1X

Identity & Access Management: Cisco ISE, RADIUS, TACACS+

Cloud Networking: AWS (VPC, Route 53, Transit Gateway, Security Groups), Azure (VNet, NSG, ExpressRoute)

Infrastructure Devices: Cisco Catalyst & Nexus Switches, Juniper Routers, Aruba Wireless Controllers

Wireless Networking: 802.11a/b/g/n/ac/ax, Cisco Meraki, Aruba

Monitoring & Troubleshooting: Wireshark, SolarWinds, PRTG, Tcpdump, NetFlow, Nslookup, Traceroute

Automation & Scripting: Python, Bash, PowerShell, Ansible

Documentation & Compliance: Network Diagrams (Visio), ITIL, NIST EXPERIENCE

Comerica Loans Jan 2025 – Current

Network Engineer

Assessed existing MPLS architecture and documented key latency and failover challenges across remote offices.

Collaborated with solution architects and OEM vendors to evaluate and select a scalable SD-WAN solution (Cisco Viptela).

Designed hybrid WAN topology integrating broadband, LTE, and MPLS circuits with dynamic path selection and application-aware routing.

Configured centralized policy templates for traffic segmentation, QoS enforcement, and application prioritization.

Deployed SD-WAN edge routers and cloud gateways across 50+ remote sites with zero-touch provisioning and remote orchestration.

Integrated cloud breakout to Microsoft 365 and AWS-hosted services, reducing latency and improving user experience by 30–40%.

Set up real-time monitoring and alerting via Cisco vManage and integrated with SolarWinds and NetFlow for telemetry.

Coordinated cross-functional testing for failover, IPSec encryption, and throughput, resolving performance issues proactively.

Trained NOC and field teams on operational procedures, fallback handling, and firmware upgrades.

Cut circuit provisioning lead time from 45 days to under 10 by leveraging broadband and LTE-first deployments.

Ensured compliance with enterprise security policy by integrating SD-WAN with Palo Alto NGFW and DNS security tools.

Documented post-migration runbooks and established SLAs with service providers to handle global change management. Coforge Nov 2020 - Jun 2023

Network Engineer

Initiated a phased rollout plan, prioritizing regions with high MPLS costs and poor application responsiveness.

Worked with regional IT leads to evaluate circuit diversity, last-mile providers, and local regulatory constraints.

Led PoC labs for different vendors (Silver Peak, Fortinet, Cisco), focusing on ease of integration and visibility.

Defined global SD-WAN templates for routing policies, traffic engineering, failover conditions, and cloud SaaS optimization.

Coordinated logistics for shipping, customs clearance, and remote installation kits across EMEA, APAC, and Americas.

Deployed cloud on-ramp capabilities to accelerate access to IaaS and SaaS platforms such as AWS, Azure, and Salesforce.

Integrated SD-WAN fabric with Zscaler and Cloudflare gateways to enforce zero-trust policies at the edge.

Established a global change advisory board (CAB) to review, test, and approve configurations before regional cutovers.

Resolved IP overlap and DNS split-horizon issues between regional offices during migration from legacy NAT appliances.

Tuned BFD and SLA thresholds to optimize active/active tunnels, reduce packet loss, and maintain sub-100ms failover.

Created knowledge base articles and training sessions to transition WAN operations to internal IT support teams.

Achieved 45% OPEX reduction in WAN connectivity while improving overall WAN uptime and user productivity. EDUCATION

Master’s in Business Analytics University of Colorado Denver

Bachelors in Electrical and Electronics Engineering TKR College of Engineering & Technology CERTIFICATION

Cisco Certified Network Associate (CCNA)

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