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L3 Network Administrator

Swathi Business Solutions
7 - 10 Years
Mumbai

Posted on: 17/07/2026

Job Description

Key Skills :


Network Administration, Network Monitoring & Performance, Network Infrastructure Management, Configuration & Backup Management, Incident Management, Problem Management, Vendor & OEM Management, Network Security, Disaster Recovery & Business Continuity, Risk & Compliance, Capacity & Availability Management, Documentation, Network Architecture, Reporting & Analytics, ITSM, Continuous Improvement, Infrastructure Management, Troubleshooting.


Job Description :


Technical Skills Required :


Roles & Responsibilities :


Required Skills :


- LAN Switching, Wireless & WAN Technologies


- Strong precise understanding with Hands-on Experience on the Network Switching-Routing, Wireless Technologies.


Switching-Routing (L2-L3) Technology :


- Hands-on Knowledge and working experience of VLANS, VTP, ISL, 802.1Q, Ether-Channel, STP, RSTP, MST, PVST, FHRP-Gateway Redundancy Protocols, Stacking, Switch Security, SPAN, RSPAN, ACL (Standard & Extended), QoS, Port-Channel, Route-map, PBR, SVI, IP Routing, Port-monitoring/mirroring.


Wireless Technology :


- Hands-on Knowledge and working experience of Cisco Wireless Controllers, AP (Lightweight and Autonomous - All Models), FlexConnect, HA/SSO, ACL, Routing, WAP Groups.


Nexus Switches :


- Hands-on Knowledge and working experience of VRF, VRF-Leaking, Spine-Leaf, VPC, FEX, VDC, OTV, VxLAN, FCoE, Fiber Channel.


- Hands-on Knowledge and working experience on Cisco 1900, 29xx, 35xx, 37xx, 38xx, 45xx, 65xx series switches; NEXUS 9K, 7K, 5K, 2K; Cisco WLCs: 3650, 5760, 3850, 25xx, 55xx, 8500 series and WISM2; Cisco APs: Aironet 1142, 1242, 1815, 1830, 1850, 2602, 27xx, 2800, 3800, 9xxx series.


WAN / Routing Technologies :


- Hands-on Knowledge and working experience of eBGP, iBGP, OSPF, IP SLA, Route-map, ACL, Prefix-list, Static Routing, Route Re-distribution, MPLS, ILL, EIGRP, RIP Advantages.


Firewalls :


- IPv4 Policy, Routing (Static), Zones, Nating, Public IPs, IPv6.


Monitoring Tools :


- PRTG, Cisco Prime, NimSoft, HP NNMi, SolarWinds, What'sUpGold, NetBrain, OpsRam or any other tools.


Central Services :


- Knowledge of DNS/DHCP, NAT, IPSEC/GRE VPN, VMs, ISE, TACACS, NAC, Proxy.


ITSM Tool :


- Service Now, BMC Remedy.


- Understanding of: Knowledge of Incident Management, Problem Management, Change Management Process, and ITIL Compliance.


- Documentation Experience using tools like Visio, PPT, Excel, Word, Acrobat pro.


Roles & Responsibilities :


- Ensure to close the tickets (Request, Incidents, Tasks, ITCHG, PBI, KB) in adhere SLA Time.


- Providing Guidance to L1 team to process the Tickets.


- Adhere the Compliance & Quality on Tickets.


- Participation in Bridge calls/MI to troubleshoot the critical issues.


- Ability to work with different vendors.


- Working with different regions of clients for day to day Network issues, flexible in work timings.


- Working on medium/Major Network Projects.


- Co-ordination with different teams to resolve the Connectivity issues.


- Participating in CAB (Change Advisory Board) and presenting Change Requests; also, doing PIR (Post Implementation Review) for each changes and publish in report.


- Participating, driving MIM and preparing RCA in PB Management.


- Part of ARB (Architecture Review Board)/Engineering/Project team (internal and customer) for new design discussion, assessing and mitigating the risk.


- Providing inputs on the in-scope IT landscape for enhancement.


- Leading / Driving the Technical discussion / reviews such as capacity planning, Risk reviews, major change planning, RCA, DR Drills.


- Owning the Major incidents and Project task for respective tower / domain.


- Providing inputs and assistance in technical changes such as Technology refresh, Migrations, New implementation / Roll out.


- Perform analysis based on trend reports, capacity reports etc for in-scope IT landscape.


- Provide inputs for fine tuning / enhancement with impact analysis of the fine-tuning changes.


- Discussion with OEM / Vendor / Suppliers for performance improvement.


- Record and track the improvement / fine-tuning.


- 24X7 monitoring of the Site availability and for any faults (like router outages, link outages, exceeding set thresholds).


- 24X7 Switch, Router, LB, Link availability monitoring.


- Configuring thresholds for Switch, Router CPU usage, & memory usage.


- Performing Switch, Router, port, VLAN configurations.


- Monitor Switch, Router CPU / memory usage.


- Monitor Switch, Router Port Status of uplink and other critical interfaces.


- Monitor and control configuration aspects like IP address, subnet mask, DNS settings, etc.


- Alarm generation, handling and filtering.


- Link Bandwidth utilization.


- Incident and Request Services monitoring.


- Addition & deletion of new locations and devices in network monitoring tool.


- Request Fulfillment Management.


- Switch, Router, Link troubleshooting and recovery in case of any outage.


- Back-up link availability testing and monitoring.


- Trend based consultancy based on historical data samples and Capacity Planning.


- Providing selective resource access by configuring suitable access list on the switch.


- Configuring authentication protocols that are available in Cisco IOS (like AAA) if any available.


- User Account Management: Configuring user authentication through TACACS or RADIUS servers if any available.


- Hardening of network devices.


- Device Configuration management.


- Load Balancer configuration management, IOS Upgrade, Cisco Switches Stacking, Non-Cisco Switching and wireless products exposure.


- Configure Real and virtual Links/Servers, Interface enable / disable.


- QoS, Policy Based Routing configurations.


- Configuring Dynamic Routing Protocols.


- Configuring NAT.


- Monitor/ analyse and fix problems due to Memory and CPU utilization and errors.


- Carry out comprehensive problem analysis and ensure resolution on time.


- Co-ordinate with vendors for Hardware related issues, TAC support and Hardware replacements.


- Device Availability Report.


- Config Backup Management.


- Vendor/OEM Coordination (raising TAC, working with Active-passive team).


- Configuration of PE link device management & configuration at branches.


- Generation of Reports like Performing Switch, Router, Load Balancer Appliance Availability Report, CPU utilization Report, Capacity Planning Report and Trend Analysis Report.


- Configuration & management of switches and controller devices.


- Incident / Request Fulfillment / Change management / MI - Major Incidents Management.


- Implement privilege rights based on user rights for controlled access.


- Implement encrypted password management mechanisms on all supported devices.


- Ensure security against asynchronous terminals, such as console terminals and from integrated modem line.


- Preparation of RCA for Major Incidents.


- Repeat Incident / Alert Analysis.


- Updation and maintenance of FMEA (Failure Mode Effect Analysis), Availability, Capacity management.


- Risk Analysis, Maintaining Risk-Register and mitigation planning.


- Continual Service Improvement Planning and executions.


- Planning and execution of DR Drills based on availability of DR setup and recovery procedures.


- Preparing, maintaining and Updation of SOP/SIP and Knowledge Base.


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