Role: Core Network Engineer

Experience: 4+ Years

Location: Mumbai (Remote support for APAC Region)

Employment Type: Full Time

Job Summary

We are looking for an experienced Core Network Engineer to support a large-scale APAC Network Fleet Management Program involving Cisco Nexus hardware refreshes, Arista MOS-to-EOS migrations, and Cisco Catalyst/Nexus management network refresh activities across multiple global data centers.

The engineer will be responsible for planning, migration execution, configuration management, validation, troubleshooting, and technical ownership throughout the project lifecycle.

Key Responsibilities

Planning & Discovery

- Participate in technical discovery workshops.
- Validate device inventory, interface mappings, and network topology.
- Review configuration baselines and migration prerequisites.
- Assess site-specific technical dependencies.

Network Migration

- Execute Cisco Nexus 3172 hardware refreshes.
- Perform Arista 7130 MOS to EOS migrations.
- Refresh Cisco Catalyst 3850 & Nexus 3048 management networks.
- Execute software upgrades and firmware migrations.
- Manage switch reloads and maintenance window activities.

Configuration Management

- Take complete configuration backups.
- Capture routing tables, MAC tables, STP topology, CPU & Memory utilization.
- Stage software images via SFTP/HTTPS.
- Push production configurations during cutover.

Validation

- Verify
- BGP
- OSPF
- VLANs
- Port Channels




- Interface status
- Optical links
- Trunk configurations
- TACACS+
- RADIUS
- MFA
- SNMP
- Syslog

Troubleshooting

- Analyze routing issues.
- Interface flaps.
- Packet drops.
- Optical failures.
- Hardware issues.
- Boot failures.
- OEM escalation (Cisco TAC / Arista TAC).

Documentation

- Prepare operational runbooks.
- Update Fleet Execution Tracker.
- Capture CLI logs.
- Prepare validation reports.
- Support project closure documentation.

Required Technical Skills

Networking

- Cisco Nexus 3K Series
- Cisco Catalyst 3850
- Nexus 3048
- Arista 7130

Routing & Switching

- BGP
- OSPF
- STP
- VLAN
- VPC
- Port Channel
- VRF

Operating Systems

- Cisco NX-OS
- Arista EOS
- MOS Migration

Network Services

- TACACS+
- RADIUS
- AAA
- SNMP
- Syslog
- NTP
- SSH

Management

- OOB Network
- Console Servers
- Maintenance Window Execution
- Change Management
- Rollback Planning

Protocol Knowledge

- L2/L3 Switching
- Routing
- Interface Troubleshooting
- Optics
- Transceivers

Tools

- SecureCRT / Putty
- SFTP
- WinSCP
- Excel
- Jira
- ServiceNow (preferred)

Required Experience

- 410 years of Network Engineering experience.
- Experience in Data Center migration projects.
- Cisco Nexus implementation.
- Arista EOS administration.
- Hardware refresh projects.
- Production maintenance window execution.
- Configuration backup and restoration.
- Post migration validation.

📌 Netwrok Engineer (Mumbai)
🏢 Nusummit Technologies
📍 Mumbai