Christian W.
Cisco Catalyst Center - SDA Wireless Consultant
Experience
Nov 2024 - Mar 2025
5 monthsBerlin, Germany
Cisco Catalyst Center - SDA Wireless Consultant
IT Service Provider
- Implemented Cisco Catalyst Center wireless network for a federal ministry in Berlin, focusing on wireless topics
- Troubleshooting day-0, day-1 and day-N templates for zero-touch provisioning of switches and access points
- Client authentication and authorization troubleshooting using Cisco ISE
- Wireless guest access via Cisco ISE captive portals
- Ekahau site surveys and WLAN survey reports
- Cisco DNA Center, Cisco WLC and Cisco ISE
- LAN and WLAN network design and planning based on existing HLD and LLD documents
- C9300L and C9500 series switches, CW9166i APs
Jun 2024 - Oct 2024
5 monthsGermany
Cisco Catalyst Center - SDA Consultant
IT Service Provider
- PoC for outdoor zero-touch provisioning of APs using Cisco Catalyst Center
- PoC for switch stack replacement (RMA) of C9300 and C9500 series switches via Cisco DNA Center, Catalyst Center
- Troubleshooting day-0, day-1 and day-N issues caused by claim files for zero-touch provisioning
- Client authentication and authorization troubleshooting using Cisco ISE
- Cisco DNA Center, Cisco WLC and Cisco ISE
- LAN and WLAN network design and planning based on existing HLD and LLD documents
- Implementation and rollout of networks ranging from 1 to 100 access switches
- C9300L, C9500 series switches, C9120 APs
Feb 2024 - Mar 2024
2 monthsGermany
Principal Wireless Consultant
IT Service Provider
- Designed Cisco SD-Access for LAN and WLAN using Cisco Catalyst Center and Cisco ISE
- Drafted PoC for SD-Access design
- Drafted PoC for Meraki AP design
Jun 2023 - Nov 2023
6 monthsGermany
Principal Wireless Consultant
IT Service Provider
- Cisco SD-Access design based on Cisco DNA Center
- Consolidated WLAN SSIDs used in production
- Redesigned an existing WLAN solution for WiFi 6 and WiFi 6E
- From September, drafted a PoC paper for Cisco SD-Access for LAN and WLAN using Cisco DNA Center and Cisco ISE, plus PoC for Meraki APs
Jun 2023 - Jun 2023
1 monthGermany
Principal Wireless Consultant
Retailer
- Reviewed WLAN designs for 802.11ac/802.11ax and WiFi 6E
- Redesigned multiple WLAN solutions for WiFi 6 and WiFi 6E in office and distribution buildings
- Troubleshot client roaming issues using Huawei and Extreme switches and SonicWall APs (LAN issue: ARP)
- Concept for Cisco Meraki APs
- AP configuration for high-density WLANs in office and distribution buildings
- Evaluated WLAN client roaming issues
- Ekahau AI Pro site surveys
- Introduced 802.1X authentication for barcode scanners
Feb 2023 - Feb 2023
1 monthGermany
Principal Wireless Consultant
Retailer
- Reviewed WLAN designs for 802.11ac/802.11ax and WiFi 6E
- Redesigned multiple WLAN solutions for WiFi 6 and WiFi 6E in office and distribution buildings
- Troubleshot client roaming issues using Huawei and Extreme switches and SonicWall APs (LAN issue: ARP)
- Concept for Cisco Meraki APs
- AP configuration for high-density WLANs in office and distribution buildings
- Evaluated WLAN client roaming issues
- Ekahau AI Pro site surveys
- Introduced 802.1X authentication for barcode scanners
Jan 2023 - Mar 2023
3 monthsGermany
Principal Wireless Consultant
Technical University
- Reviewed and redesigned a WLAN for WiFi 6E
- Troubleshot RADIUS authentications
- Configured APs for a high-density WLAN in an auditorium
- Evaluated device roaming
- Ekahau AI Pro site survey
- Introduced 802.1X for lab networks using Aruba ClearPass and Mobility Conductor
Nov 2022 - Nov 2022
1 monthGermany
Principal Wireless Consultant
Software Development
- Installed WLC9800-L in HA mode
- Redesigned an existing WLAN for WiFi 6E
- Configured WPA3 WLAN SSIDs
- Troubleshot RADIUS authentications
- AP configuration for high-density WLANs in offices
- Evaluated client roaming
- Ekahau AI Pro site survey for Cisco C9136i APs
Jun 2021 - Mar 2025
3 years 10 monthsPrincipal Wireless Consultant
Retailer - Drug Store
- AP layout and redesign of existing and new stores; predictive planning with Ekahau AI Pro
- Redesigned WLAN solutions for voice-over-WLAN
- Evaluated WLC configurations for 9800 series
- Planned AP migration in offices, distribution centers and warehouses across DE, AT, HR, SK, IT, PL
- Cisco WLC 5520 and 9800
- Cisco AP 2802i series, C91xy APs, 4800i APs, Meraki MR36
- Troubleshot WLAN device roaming
- Ekahau AI Pro planning and site surveys
- Evaluated roaming for mobile devices on iOS and Android
- Redesigned WLAN for WiFi 6E in several stores using Meraki APs
- Cisco DNA Center
- Post-implementation site surveys in shops around Munich
- Migration concepts for WiFi 6E in dense urban stores
Jan 2021 - Apr 2021
4 monthsGermany
Senior Wireless, Mobility Consultant
IT Department
- WLAN consulting
- WLC configuration and RF design for logistics buildings
- WLAN RF improvements
- AP migration
- WLC software upgrades and hardware migration planning
Dec 2020 - Nov 2022
2 yearsGermany
Principal Wireless Consultant
Public Transport
- RF redesign in Europe’s largest public WLAN, up to 600,000 devices daily
- Redesigned WLAN in ICE train coaches
- Troubleshot RADIUS authentication
- AP configuration for high-density WLANs in trains and stations
- Evaluated client roaming
- Ekahau AI Pro measurements and NetAlly G3
Dec 2020 - Mar 2021
4 monthsSwitzerland
Senior Wireless Consultant
Psychiatry
- Redesigned an existing WLAN
- Designed AP layout for voice-over-WLAN
- Evaluated several WLC configurations
- Planned AP layout for 40+ locations across buildings
- Cisco WLC 5520
- Cisco AP 2802i series
- Ekahau Pro
Aug 2020 - Nov 2020
4 monthsSwitzerland
Senior Wireless Consultant
IT Service Provider
- Redesigned AP layout for a Swiss university
- Evaluated Ekahau site survey measurements
- Reconfigured a high-density WLAN for an auditorium
- Proposed Cisco Meraki AP configurations
- WLC v8.10.112.0
- WLC 8410
Aug 2020 - Oct 2020
3 monthsGermany
Senior Wireless Consultant
Engineering
- General WLAN planning and simulation with Ekahau for bottling plants using Realwear HMT-1 and MS HoloLens 2
- Evaluated Ekahau site survey measurements
- Redesigned AP layout
- Configured EWC for video-over-WLAN solutions
- EWC v16.12 and v17.1
Aug 2019 - Dec 2022
3 years 5 monthsGermany
Senior Wireless, Mobility Consultant
IT Department
- WLAN consulting, WLC configuration and RF design for autonomous container vehicles in terminals to ensure roaming
- WGB setup
- Cisco WLC 9800-CL configuration
- WLAN RF improvements, AP migration, software upgrades and hardware migration planning
- Introduced PRP (Parallel Redundancy Protocol) in WLAN
- PoC for Cisco Meraki APs in container terminals
- Spectrum analysis in German terminals using R&S FPH6 for LTE-TDD and WLAN interference
Jan 2019 - Sep 2019
9 monthsGermany
Senior Wireless, Mobility Consultant
IT Department
- WLAN consulting and Cisco WLAN design
- Client roaming topics
- QoS for voice over wireless in high-rack storage and distribution centers
- WLAN design for large data transfers (>20 GB) between parked and moving vehicles
Oct 2018 - Nov 2018
2 monthsGermany
Senior Wireless, Mobility Consultant
IT Department
- WLAN consulting and Cisco WLAN design, client roaming topics
- QoS for voice over wireless
- Global WLC architecture
- Troubleshooting production WLAN issues
- Cisco Prime, Cisco ISE
Jun 2018 - Aug 2019
1 year 3 monthsGermany
Senior Wireless, Mobility Consultant
IT Department
- Managed wireless topics during transition operations for a German car manufacturer
- Troubleshot production WLAN issues
Aug 2017 - Nov 2017
4 monthsBonn, Germany
Senior Wireless, Mobility Consultant
IT Department
- Designed, implemented and redesigned WLC clusters for 802.11ac high-density WLAN at COP23 in Bonn
- Migrated FlexConnect APs from WLC 7500 to local-mode APs on WLC 5520
- RF site surveys with Ekahau
- Installed and ran Cisco Prime v3.1
- Managed 28,000 concurrent WLAN clients during the Bonn COP event
May 2017 - Mar 2020
2 years 11 monthsSenior Wireless, Mobility Consultant
IT Department
- Redesigned WLCs across multiple countries for 802.11ac
- Migrated from 5508 to 5520 WLC
- Site survey measurements in production environments
- Authenticated Win7, Win10 and iOS devices with ACS v5.8 and ISE (PEAP, EAP-TLS)
- Migrated ACS to ISE v2.4, upgraded ISE to v2.6
- Deployed ISE for 802.1X NAC for wired and wireless
- Guest WLAN via ISE
- Installed Cisco Prime v3.4–3.7
- Low-cost iPerf performance tests with Raspberry Pi (wired and wireless)
Apr 2017 - Present
8 years 5 monthsWeiherhammer, Germany
WLAN Service Provider
Skigau Werdenfels
- Provided WLAN service at the biathlon stadium in Kaltenbrunn/Garmisch-Partenkirchen for DSC and DP competitions
Mar 2017 - Jun 2017
4 monthsGermany
Senior Wireless, Mobility and Security Consultant
IT Department
- Redesigned WLAN for a new campus with 802.11ac wave 2
- Deployed wireless endpoints
- Managed site surveys for production and office areas
- Implemented authentication for employees and BYOD
- Configured guest access and ran PoC for 802.11ac WLANs
- Created templates for Cisco Prime Infrastructure v3.1
- Radius server: Cisco ISE v2.1
- MSE v8.0.140
Oct 2016 - Mar 2017
6 monthsGermany
Senior Wireless, Mobility and Security Consultant
IT Department
- Redesigned WLAN and evaluated 802.11ac wave 2 designs
- High-density setup in a hospital auditorium
- Deployed new AP and WLC hardware
- Planned migration strategy
- Employee and BYOD authentication
- Cisco Prime Infrastructure v3.1
- Radius server: Cisco ISE v2.1
- CMX and MSE
Sep 2016 - Dec 2016
4 monthsGermany
Senior Wireless, Mobility and Security Consultant
IT Department
- Redesigned WLAN for a new campus with 802.11ac wave 2
- Deployed wireless endpoints
- Managed site surveys for production and office areas
- Implemented authentication for employees and BYOD
- Configured guest access and ran PoC for 802.11ac WLANs
- Created templates for Cisco Prime Infrastructure v3.1
- Radius server: Cisco ISE v2.1
- MSE v8.0.140
Apr 2016 - Apr 2016
1 monthSenior Wireless, Mobility and Security Consultant
IT Department
- TACACS+ authentication for multiple Cisco network devices
- Guest WLAN access
- Upgraded Cisco Prime to v3.0
- Radius server: Cisco ISE v2.1
Nov 2015 - Aug 2018
2 years 10 monthsSenior Wireless, Mobility and Security Consultant
IT Department
- Redesigned an existing WLAN across four European countries for 802.11ac (~40,000 devices, 15,000 APs)
- Managed site surveys for production and office areas
- Authenticated employees and BYOD via ISE
- Guest WLAN and PoC
- Migrated multiple WLCs within a data center
- Upgraded Cisco Prime to v3.x
- Radius server: ISE v2.1–2.3
- PoC for WLAN NAC
Sep 2015 - May 2016
9 monthsBonn, Germany
Senior Wireless, Mobility and Security Consultant
IT Department within a Bank
- Redesigned and ran PoC for 802.11ac WLANs
- Migrated WLC within data centers
- Upgraded Cisco Prime to v3.0
- Radius server: Cisco ISE v1.3
- Cisco Prime Infrastructure 2.1, 2.2, 3.0
Jul 2015 - Oct 2015
4 monthsStuttgart, Germany
Senior Wireless, Mobility and Security Consultant
IT department
- Redesigned and ran PoC for WLANs at a US racetrack, office WLANs for new/existing buildings and showrooms
- Upgraded WLC and Cisco Prime
- Radius server: Cisco ISE v1.2
- Cisco Prime Infrastructure
Nov 2014 - Jul 2015
9 monthsMunich, Germany
Senior Wireless, Mobility and Security Consultant
IT Department within a bank
- Designed and PoC for banking WLANs using 802.11ac
- Client authentication via 802.1X (EAP-TLS) per bank location
- Deployed Meraki APs in remote sites
- Radius server: Cisco ISE v1.3
- Cisco Prime Infrastructure 2.1, 2.2
Nov 2013 - Oct 2014
1 yearGermany
On-siteCisco Advanced Service, On Site Consultant
IT Service Provider
- Designed, implemented and troubleshot WLANs across Europe
- Redesigned according to Cisco best practices
- RF analysis and optimization of industrial WLANs
- Site surveys using Ekahau
- PoC and implementation of EAP-TLS (802.1X) WLANs
- Troubleshot with Cisco ISE and ACS 5.3
- Packet analysis with Wireshark for workgroup bridge roaming
- Drafted templates for Cisco Prime 2.0
- Meraki AP RF planning
Nov 2013 - Jul 2014
9 monthsKarlsruhe, Germany
Cisco Advanced Service Consultant
IT Service Provider within a Bank
- Designed, PoC, implemented and troubleshot bank WLAN SSIDs in Germany
- Client authentication by bank location
- Radius server: Cisco ISE
- LDAP/RADIUS auth for various network devices
Jan 2012 - Dec 2013
2 yearsTraunreut, Germany
Senior Network Consultant
IT Department
- Designed, implemented and troubleshot LAN and WLAN across multiple sites
- Developed and rolled out operations and security concepts
- IP redesign for L3 core and distribution layers
- Data center solutions with Nexus 2000, 5000/5500, FlexPod
- PoC and implementation of EAP-TLS WLANs with ISE troubleshooting
- Designed and implemented Cisco ISE
- PoC and WLAN implementation for scanners and devices (macOS, iOS, Win7, XP)
- Migration planning from WCS to Prime
- Baselined Cisco switch/router configs
- Recommended Cisco hardware (switches, APs, WLCs) and IOS
Jul 2011 - Dec 2011
6 monthsGermany
Senior Network Consultant
Different Customer Network in Germany
- Designed, implemented and troubleshot LAN and WLAN networks
- Developed and introduced ops and security processes
- Data center solutions with Nexus 2000, 5000/5500 and FlexPod
Dec 2010 - May 2011
6 monthsZürich, Switzerland
IT Architect in Cisco Competence Center
IT Service Provider
- Enhanced existing MPLS network environments for a public client (Canton Zurich)
- Planned, designed, tested and implemented routing redundancy for two security gateways in an MPLS network
- Created, lab-tested and implemented QoS for voice, video and data in the MPLS network
- Developed and tested 802.1X WLAN concepts in a lab on Cisco
- Planned and implemented VRFs and VLANs for various customer connections
- Planned, coordinated and executed the relocation of two core sites
Nov 2010 - Nov 2010
1 monthHungary
Senior Consultant
Car Manufacturer
- Implemented and installed network solutions
- Defined and enforced quality standards for strategy and architecture
- Communicated the architecture
Jun 2008 - Jun 2010
2 years 1 monthMunich, Germany
Project Manager LAN Aktiv
BWI IT
- Assessed current IT security and network state for data and telecom
- Developed OSPF routing concepts
- Planned VLANs and IP address schemes
- Designed campus enterprise network structures per BSI basic protection
- Created base configs and aligned client requirements with design guidelines
- Coordinated installation with on-site client
- Implemented routing changes for Layer 2 and 3
- Troubleshot VoIP, data and multicast
- Documented and handed over projects to operations
- Maintained quality criteria and reported to project management
- Planned all steps with MS Project Server in a hierarchical multiuser environment
Apr 2008 - Jul 2008
4 monthsSwitzerland
Consultant IT Security
Swisscom IT
- Advised clients on technical security solutions, architectures and processes
- Planned, coordinated with client and implemented solutions in a Check Point environment
- Estimated resource needs
Feb 2008 - Mar 2008
2 monthsHanover, Germany
IT Bid Manager
T-Systems
- Project lead for RFP on mobile, fixed-line, data networks and IT security services
- Prepared tender documents
- Supported presales delivery for proposals
- Coordinated and created concepts and service descriptions
- Aligned proposal content
- Coordinated network concepts
- Managed internal suppliers
Jun 2007 - Jan 2008
8 monthsFrankfurt, Germany
IT Project Manager and IT Process Manager
Lufthansa Systems Infratec
- Project management, process definition and automation for handovers from engineering to operations in the client’s data center, focusing on efficiency, lean processes and security
- Created process specs and streamlined workflows for global handovers
- Defined, built, aligned and implemented handover processes in the data center per ITIL, meeting quality, cost and timeline goals
- Defined and introduced key performance indicators
- Moderated project and alignment meetings
- Reported on process development for the global data center relocation project
- ITIL service support (incident & change management)
- Coordinated network management systems (HP Network Node Manager, Nagios)
- Aligned data sync processes with the CMDB (Peregrine Service Center)
Jul 2006 - Dec 2006
6 monthsUlm, Germany
Consultant
DaimlerChrysler AG, Research and Technology
- Coordinated implementation and operational setup of a communication test system (CTS) for AM/FM, GPS and GSM for the new C-Class (W204)
- Defined and implemented 2nd-level support activities and processes per ITIL, coordinating production, maintenance and supplier teams
- Coordinated CTS enhancements for new services (Keyless-Go, DAB, TV, SDARS)
- Adapted CTS to different vehicle models
- ITIL service delivery (SLM) and support (incident) processes
Jan 2006 - Feb 2006
2 monthsMunich, Germany
Interim Project Manager
Consulting Company
- Management consulting and process optimization
- Reported to management
- Supported achievement of outsourcing KPIs
- Staff leadership and recruiting
- Coordinated, trained and led short-term interim control
- Defined and created OEE metrics per Six Sigma
- Created dashboard visuals for outsourcing targets
Jan 2003 - Dec 2005
3 yearsWeßling, Germany
Senior Systems Engineer
Systems Engineering and Support Services GbR
- Coordinated, reported, designed, planned, implemented, documented and managed suppliers for a global IP data network on ISS Columbus module using Cisco components
- Developed, designed, planned, coordinated, executed and documented IP networks for data, voice and multicast
- Created OSPF routing concepts
- Conducted pre-installation site acceptance tests
- Coordinated node installations with ESA partners (NASA, RSA)
- Configured and troubleshot Cisco routers, switches and firewalls
- Developed operations, maintenance and disaster plans for the Cisco IP network
- Designed, planned, coordinated, executed and documented end-to-end system acceptance and load tests
- Planned, coordinated and documented software acceptance and upgrade tests
- Coordinated subsystems in Columbus ground segment
- Defined and aligned ground operations processes and procedures
- ITIL support processes: release, change and problem management
- ITIL delivery processes: availability and service level management
Oct 2001 - Nov 2002
1 year 2 monthsMunich, Germany
Lawful Interception Specialist
Quam Group 3G GmbH
- Assessed new services for lawful interception
- Planned technical requirements for surveillance under German Telecommunications Act § 88
- Managed suppliers
- Coordinated surveillance planning with the telecom regulator
- Held technical responsibility during contract negotiations for voicemail software to meet interception requirements
Oct 2001 - Nov 2002
1 year 2 monthsMunich, Germany
Operations and Maintenance Specialist
Quam Group 3G GmbH
- Planned IT network management systems
- Deployed HP OpenView and CiscoWorks for the Operations and Maintenance Centre per Telefónica requirements
- Prepared RFI and RFQ for network tech
- Supported procurement in technical contracting
- Managed suppliers
Oct 2001 - Nov 2002
1 year 2 monthsMunich, Germany
Release Manager Networks
Quam Group 3G GmbH
- Project reporting and management at director level
- ITIL service support: release management
- Coordinated network feasibility studies for new product requirements
- Aligned feasibility analyses with network leadership
- Coordinated all network studies with marketing and IT
- Created network-marketing-IT release process
Oct 1998 - Sep 2001
3 yearsMunich, Germany
Network Planning Engineer
VIAG Interkom GmbH
- Defined BSS planning guidelines and BSC dimensioning
- Managed suppliers
- Led BSS software planning projects
- Managed system tech upgrades and swaps
- Developed RFI/RFQ and vendor negotiations for GSM/GPRS/UMTS BSS and UTRAN hardware and software
- ITIL delivery: capacity management
- ITIL support: release and configuration management
- Designed and defined processes
- Internal customer management
- Led technology working groups
- Represented the group leader
Jul 1996 - Sep 1998
2 years 3 monthsMunich, Germany
GSM Radio Network Planner
Mannesmann Mobilfunk GmbH
- Planned GSM networks by capacity and coverage for a regional area
- Familiar with Siemens and Ericsson base station technologies and planning criteria
- Technical lead for special radio network planning project at Munich Airport
Summary
Comprehensive project experience in the area of enterprise networks, whether wired or wireless
Specialized in wireless local area networking (WLAN) radio frequency issues
Troubleshooting RF-related problems in complex environments
Consulting, design, proof of concept, implementation, operations and troubleshooting of complex enterprise WLAN networks
WLAN site surveys across various industries using tools like Ekahau, Hamina, Wireshark, Sidos, Netally
Enterprise Local Area Network (LAN) experience since 2001
Enterprise Wireless Local Area Network (WLAN) experience since 2012
Consulting experience since 2001
Proven track record of solving WLAN issues in complex RF environments
WLAN RF planning and optimization for office buildings, warehouses, container terminals, trade fairs, factory buildings, distribution centers and high-speed train carriages
Network operations for multiple WLCs and up to 20,000 access points in sectors like automotive, distribution centers and trade fairs
AP layout planning for seamless roaming regardless of hardware vendor or SSID security
WLAN planning for high-density environments at trade fairs, higher education institutions, universities and public hotspots
PoC, design and implementation of Cisco Software Defined Access Networks based on Cisco Catalyst Center
Languages
German
NativeEnglish
AdvancedEducation
Oct 1994 - Sep 1995
University of Leeds
Master of Science in Engineering · Radio Communications and High Frequency Engineering · Leeds, United Kingdom
Oct 1988 - Jun 1994
Fachhochschule Würzburg-Schweinfurt
Diplom-Ingenieur (FH) Communications Engineering · Communications Engineering · Germany
Certifications & licenses
CISSP
(ISC)²
CCNP Routing and Switching
Cisco
CCNP Security
Cisco
CCNP Wireless
Cisco
Project Management - Specialist (GPM, Level D)
GPM
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