Christian W. - Cisco Catalyst Center - SDA Wireless Consultant

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Bad Tölz, Germany

Experience

Nov 2024 - Mar 2025

5 months

Berlin, Germany

Cisco Catalyst Center - SDA Wireless Consultant

IT Service Provider

Implementation of Cisco Catalyst Center wireless network within a Federal Ministry in Berlin focusing on wireless topics
Trouble shooting for day 0, 1 and day N templates for zero touch provisioning for switches and access points
Client AuthC and AuthZ trouble shooting utilization of Cisco ISE
Wireless Guest Access using Cisco ISE Captive Portals
Ekahau Site Surveys, 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 months

Germany

Cisco Catalyst Center - SDA Consultant

IT Service Provider

PoC for an outdoor zero touch provisioning APs using Cisco Catalyst Center
PoC for a switch stack replacement (RMA) for C9300 and C9500 series switches done by the Cisco DNA-C, Catalyst Center
Trouble shooting for day 0, 1 and N caused by claim files for zero touch provisioning
Client AuthC and AuthZ trouble shooting utilization of 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 roll-out of different network sizes from one up to 100 Access Switches
C9300L, C9500 Series Switches, C9120

Feb 2024 - Mar 2024

2 months

Germany

Principal Wireless Consultant

IT Service Provider

Design for Cisco SD Access for LAN and WLAN based on Cisco Catalyst-Center and Cisco ISE
PoC draft for SD-Access Design
PoC draft for Meraki AP design

Jun 2023 - Nov 2023

6 months

Germany

Principal Wireless Consultant

IT Service Provider

Cisco SD-Access design based on Cisco DNA-Center
Consolidated of WLAN SSIDs used in the production
Re-Design of an existing WLAN solution for WIFI6 and WIFI-6E
Starting in September Draft of a Cisco SD Access PoC Paper for LAN as well as WLAN for Cisco DNA-Center and Cisco ISE and PoC for Meraki APs (MR)

Jun 2023 - Jun 2023

1 month

Germany

Principal Wireless Consultant

Retailer

Review WLAN design for WLAN 802.11ac/802.11ax and WiFi-6E
Re-Design of several existing WLAN solutions for WIFI6 and WiFi-6E used office and distribution buildings
Trouble Shooting for WLAN clients roaming using Huawei and Extreme Switches and SonicWall Access Points ( LAN Subject - ARP issue)
Concept for Cisco Meraki APs
AP configuration for High Density WLAN networks used in office and distribution buildings
Evaluation of WLAN Client roaming issues
Ekahau AI Pro Site Surveys
Introduction of 802.1x authentication for Bar Code scanner

Feb 2023 - Feb 2023

1 month

Germany

Principal Wireless Consultant

Retailer

Review WLAN design for WLAN 802.11ac/802.11ax and WiFi-6E
Re-Design of several existing WLAN solutions for WIFI6 and WiFi-6E used office and distribution buildings
Trouble Shooting for WLAN clients roaming using Huawei and Extreme Switches and SonicWall Access Points ( LAN Subject - ARP issue)
Concept for Cisco Meraki APs
AP configuration for High Density WLAN networks used in office and distribution buildings
Evaluation of WLAN Client roaming issues
Ekahau AI Pro Site Surveys
Introduction of 802.1x authentication for Bar Code scanner

Jan 2023 - Mar 2023

3 months

Germany

Principal Wireless Consultant

Technical University

Review and re-design of an WLAN design for WiFi-6E
Trouble Shooting RADIUS authentications
AP configuration of an High Density WLAN network used in auditorium
Evaluation of WLAN device roaming
Ekahau AI Pro Site Survey
Introduction of 802.1x for labor networks using Aruba Clear Path and Mobility Conductor

Nov 2022 - Nov 2022

1 month

Germany

Principal Wireless Consultant

Software Development

WLC9800-L Installation as a HA
Re-Design of an existing WLAN Network for WIFI-6E
WPA3 WLAN SSIDs
Trouble shooting RADIUS authentications
AP configuration for High Density WLAN Networks used in Offices
Evaluation of WLAN client roaming
Ekahau AI Pro Site Survey for Cisco C9136i APs

Jun 2021 - Mar 2025

3 years 10 months

Principal Wireless Consultant

Retailer - Drug Store

AP layout and Re-Design of several existing as well as new shop, Predictive AP layout planning using Ekahau AI Pro
Re-Design existing WLAN solutions for Voice-over-WLAN Service
Evaluation of WLC configurations for 9800 WLCs
Planning of AP Migration in Office buildings, distribution centers and storage buildings in several countries like DE, AT, HR, SK, IT, HR, PL, .
Cisco WLC 5520 and WLC 9800
Cisco AP 2802i Series, C91xy APs, Cisco AP4800i, Meraki MR36
Trouble Shooting WLAN device roaming including
Ekahau AI Pro Planning and Site Survey
Evaluation of roaming subjects for mobile WLAN devices using iOS and Android OS
WLAN Re-design for several shops for WiFi-6E for Meraki APs
Cisco DNA Center
Post Implementation Site Survey in several shops in greater Munich area
Migration concepts for WiFi-6E in shops for dense urban areas

Jan 2021 - Apr 2021

4 months

Germany

Senior Wireless, Mobility Consultant

IT Department

WLAN Consulting,
WLC configuration and RF design for logistic buildings
WLAN RF improvements
AP migration
WLC SW Upgrade, WLC HW migration concept

Dec 2020 - Nov 2022

2 years

Germany

Principal Wireless Consultant

Public Transport

RF re-design in Europe’s largest public WLAN, up to 600.000 WLAN devices daily
Re-Design of existing WLAN solution in train coaches (ICE trains)
Trouble shooting of RADIUS authentication
AP Configuration for High Density WLAN network in train Coaches as well as in train stations
Evaluation of WLAN device roaming
Ekahau AI Pro Measurements as well as Netally G3

Dec 2020 - Mar 2021

4 months

Switzerland

Senior Wireless Consultant

Psychiatry

Re-design of an existing WLAN Network,
Design and AP layout for Voice over WLAN service
Evaluation of serval different WLC configurations
New Planning of AP layout for around 40 locations in several different buildings
Cisco WLC 5520
Cisco AP 2802i Series
Ekahau Pro

Aug 2020 - Nov 2020

4 months

Switzerland

Senior Wireless Consultant

IT Service Provider

Re-Design of an AP layout for a University in Switzerland
Evaluation of Ekahau Site Survey measurements
Re-configuration for High Density WLAN for university auditorium
Configuration proposal for Cisco Meraki APs
WLC v8.10.112.0
WLC type 8410

Aug 2020 - Oct 2020

3 months

Germany

Senior Wireless Consultant

Engineering

generic WLAN planning and simulation using Ekahau for several bottling plants using Realwear HMT-1 and MS HoloLens2
Evaluation of Ekahau Site Survey measurements
Redesign of AP layout
EWC Neu configuration for video over WLAN Solutions
EWC v16.12 and v17.1

Aug 2019 - Dec 2022

3 years 5 months

Germany

Senior Wireless, Mobility Consultant

IT Department

WLAN consulting, WLC configuration and RF design for autonomic Container Vehicles used in Container Terminals for WLAN client roaming
WGB
Cisco WLC 9800-CL configuration
WLAN RF improvements, AP migration, WLC SW Upgrade, WLC HW migration concept
Introduction of PRP (parallel redundancy protocol) in WLAN
PoC for Cisco Meraki APs in Container Terminals
WLAN spectrum analyses for several container terminals in DE
Interference measurements using R&S Spectrum Packet rider FPH6, for LTE TDD as well as WLAN Interferences

Jan 2019 - Sep 2019

9 months

Germany

Senior Wireless, Mobility Consultant

IT Department

WLAN consulting and Cisco WLAN design
client roaming topics
QoS for voice over wireless for high rack storage and distribution buildings
WLAN design for die transmission of hugh data amounts between parking and moving vehicles ( > 20 GB)

Oct 2018 - Nov 2018

2 months

Germany

Senior Wireless, Mobility Consultant

IT Department

WLAN consulting and Cisco WLAN design, client roaming subjects
QoS for voice over Wireless
global WLC architecture
Trouble Shooing production WLAN topics
Cisco Prime, Cisco ISE

Jun 2018 - Aug 2019

1 year 3 months

Germany

Senior Wireless, Mobility Consultant

IT Department

Transition operations of an Germany car manufacturer for the wireless topics
Trouble Shooting productions WLAN

Aug 2017 - Nov 2017

4 months

Bonn, Germany

Senior Wireless, Mobility Consultant

IT Department

Design of WLCs, implementation and Re-Design, of existing and new WLC Cluster for 802.11ac High Density WLAN solutions for the COP23.de in Bonn world climate conference
WLC migration from WLC 7500 Flexconnect AP towards 5520 WLC with local mode APs
RF- Site Survey measurements using Ekahau
Installation and operations of Cisco Prime v3.1
Operation of the WLAN network with 28.000 concurrent WLAN clients during the COP in Bonn.

May 2017 - Mar 2020

2 years 11 months

Senior Wireless, Mobility Consultant

IT Department

Re-Design of WLCs for several countries for 802.11ac
WLC Migration from 5508 towards 5520,
Site Survey Measurements in productions environments
authentication of Win7, Win10 and iOS devices using Cisco ACS v5.8 and Cisco ISE for PEAP and EAP-TLS
Migration of Cisco ACS towards Cisco ISE, v2.4, ISE upgrade on v2.6
Cisco ISE for 802.1x (NAC) authentication for wired and wireless devices,
Guest WLAN based on Cisco ISE,
Installation of Cisco Prime v3.4 until v3.7
low cost iPerf Performance Test based on Raspberry Pi - wired and wireless

Apr 2017 - Present

8 years 9 months

Weiherhammer, Germany

WLAN Service Provider

Skigau Werdenfels

Providing WLAN Service in the biathlon stadium in Kaltenbrunn / GAP for the DSC and DP Competitions for the “Skigau Werdenfels”

Mar 2017 - Jun 2017

4 months

Germany

Senior Wireless, Mobility and Security Consultant

IT Department

Re-Design of a WLAN for a new campus for 802.11ac Wave 2
Wireless Endpoints
Site Survey Management for Production and Office Environment
Authentication for Employees and BYOD Devices
Guest Access and Proof of Concept of a WLAN for 802.11ac
Template Production for Cisco Prime Infrastructure Version 3.1
RADIUS Server Cisco ISE v2.1
MSE v8.0.140

Oct 2016 - Mar 2017

6 months

Germany

Senior Wireless, Mobility and Security Consultant

IT Department

Re-Design of WLAN, Design Evaluation for a 802.11ac Wave 2 Wi-Fi
Hospital, High Density for Auditorium
New WLAN AP and WLC Hardware
Migration Strategy
Authentication for Employees and BYOD Devices
Cisco Prime Infrastructure Version 3.1
RADIUS Server Cisco ISE v2.1
CMX and MSE

Sep 2016 - Dec 2016

4 months

Germany

Senior Wireless, Mobility and Security Consultant

IT Department

Re-Design of a WLAN for a new campus for 802.11ac Wave 2
Wireless Endpoints
Site Survey Management for Production and Office Environment
Authentication for Employees and BYOD Devices
Guest Access and Proof of Concept of a WLAN for 802.11ac
Template Production for Cisco Prime Infrastructure Version 3.1
RADIUS Server Cisco ISE v2.1
MSE v8.0.140

Apr 2016 - Apr 2016

1 month

Senior Wireless, Mobility and Security Consultant

IT Department

TACACS+ Authentication for Several Cisco Network Devices
Guest Access WLAN
Upgrade Cisco Prime to Version 3.0
RADIUS Server Cisco ISE v2.1

Nov 2015 - Aug 2018

2 years 10 months

Senior Wireless, Mobility and Security Consultant

IT Department

Redesign of an existing WLAN network for four countries in Europe for 802.11ac
About 40,000 wireless devices and 15,000 APs
Site survey measurements and management for production and office environments
Authentication of employee and BYOD devices using Cisco ISE
WLAN guest access and proof of concept
Migration of several WLCs within a data center
Upgraded Cisco Prime to version 3.x
Cisco ISE RADIUS Server v2.1, v2.2 and v2.3
WLAN NAC proof of concept

Sep 2015 - May 2016

9 months

Bonn, Germany

Senior Wireless, Mobility and Security Consultant

IT Department within a Bank

Redesign and proof of concept of WLANs for 802.11ac
Migration of WLCs within data centers
Upgraded Cisco Prime to version 3.0
Cisco ISE RADIUS Server v1.3
Cisco Prime Infrastructure 2.2, 2.1 and 3.0

Jul 2015 - Oct 2015

4 months

Stuttgart, Germany

Senior Wireless, Mobility and Security Consultant

IT department

Redesign and proof of concept of WLAN on a racetrack in the USA, new design of office WLANs for new and existing office buildings and car showrooms
Upgraded WLC and Cisco Prime
Cisco ISE RADIUS Server v1.2
Cisco Prime Infrastructure

Nov 2014 - Jul 2015

9 months

Munich, Germany

Senior Wireless, Mobility and Security Consultant

IT Department within a bank

Design and proof of concept of WLAN for bank use using 802.11ac
Client authentication based on bank locations using 802.1x (EAP-TLS)
Use of Meraki APs in remote locations
Cisco ISE RADIUS Server v1.3
Cisco Prime Infrastructure 2.2 and 2.1

Nov 2013 - Oct 2014

1 year

Germany

On-site

Cisco Advanced Service, On Site Consultant

IT Service Provider

New design, implementation and troubleshooting of WLAN networks used throughout Europe
Redesign according to Cisco best practices
Design, testing, implementation and troubleshooting
RF analysis and optimization of complex industrial WLANs
Site survey using Ekahau software
Proof of concept and implementation of several WLANs with authentication based on EAP-TLS (802.1x)
Troubleshooting Cisco ISE and Cisco ACS 5.3
Troubleshooting with Wireshark for workgroup bridge roaming
Template drafting for Cisco Prime 2.0
Meraki AP RF planning

Nov 2013 - Jul 2014

9 months

Karlsruhe, Germany

Cisco Advanced Service Consultant

IT Service Provider within a Bank

Design, PoC, implementation, trouble shooting of WLAN SSID for banks WLANs locations in DE
Client authentication depending on the bank location
Radius Server Cisco ISE
LDAP RADIUS authentication for several network devices

Jan 2012 - Dec 2013

2 years

Traunreut, Germany

Senior Network Consultant

IT Department

New design, implementation, trouble shooting of LAN and WLAN Networks used on several different locations
Development and Introduction of operations and security conception
IP Re-Design for L3 Core- and Distribution layer within the LAN
Design and implementation of Data Center Solutions based on Nexus 2000, 5000/5500, FlexPod configuration
Proof of Concept was well as implementation several WLANs based with authentication based on EAP TLS, trouble Shooting Cisco ISE
Design and Implementation of Cisco ISE
Proof of Concept and implementation of WLAN for several hand scanner and WLAN devices (Mac OS X, iOS, Win7, WinXP)
Migration planning of WCS towards Cisco Prime
Baselining different configurations several Cisco switches and router
Recommendation and Selection of Cisco Hardware (Switches, APs, WLCs ) as well as IOS software

Jul 2011 - Dec 2011

6 months

Germany

Senior Network Consultant

Different Customer Network in Germany

New Design, implementation, Trouble Shooting of LAN and WLAN networks
Development and Introduction of operations as well as security concepts
Design and implementation of Data Center Solutions based on Nexus 2000, 5000/5500 technology, FlexPod configuation

Dec 2010 - May 2011

6 months

Zürich, Switzerland

IT Architect in Cisco Competence Center

IT Service Provider

Further development of existing MPLS network environments for a public client (Canton of Zurich)
Planning, design, testing, and implementation of a routing concept for a redundancy solution of two security gateways in an MPLS network
Creation, lab testing, and implementation of a QoS (Quality of Service) concept for the MPLS network for voice, video, and data
Creation and execution of system tests in a lab for a Cisco-based 802.1x WLAN concept
Planning and implementing VRFs and VLANs for different customer connections
Planning, coordination, and execution of a move of two core sites

Nov 2010 - Nov 2010

1 month

Hungary

Senior Consultant

Car Manufacturer

Implementation and installation of network solutions
Developing and enforcing quality standards regarding strategy and architectures
Communicating the architecture

Jun 2008 - Jun 2010

2 years 1 month

Munich, Germany

Active LAN Project Manager

BWI IT

Capturing and documenting the current state of IT security and data and telecommunication networks
Creating routing concepts for the OSPF routing protocol
Planning VLAN and IP address schemes
Conceptualizing, designing and developing network structures for campus enterprise networks based on BSI basic protection
Creating the base configuration and aligning customer requirements with the design guidelines
Coordinating installation with the customer on site
Implementing routing changes for Layer 2 and Layer 3
Troubleshooting for VoIP, data and multicast
Documenting and handing over projects to operations
Ensuring quality criteria and reporting to the overall project management
Planning all project steps with MS Project Server in a hierarchical multi-user organization

Apr 2008 - Jul 2008

4 months

Switzerland

Consultant IT Security

Swisscom IT

Advising customers on various technical security solutions, architectures and processes
Planning, coordinating with the customer and implementing the solution in a Checkpoint environment
Determining resource requirements

Feb 2008 - Mar 2008

2 months

Hanover, Germany

IT Bid Manager

T-Systems

Project manager for a customer project tender for mobile, fixed-line, data networks and IT security services
Preparing tender documents
Supporting delivery in the presales phase for proposals
Coordinating and preparing concepts and service descriptions
Aligning service content of proposals
Aligning network concepts
Managing internal suppliers

Jun 2007 - Jan 2008

8 months

Frankfurt, Germany

IT Project Manager and IT Process Manager

Lufthansa Systems Infratec

Project management, process redefinition and automation for handovers from engineering to operations in the customer's data center for various IT projects, focusing on efficiency, streamlining and IT security
Creating process specifications and streamlining the 'work flow' for global operational handovers
Defining, building, aligning and implementing operational handover processes in the customer's data center based on ITIL, between production and various operations sites in Europe, while meeting quality goals, costs and schedules
Defining, coordinating and introducing necessary key performance indicators
Moderating project meetings and coordination meetings
Reporting process development to the overall project for relocating the data center to an EU country
ITIL service support incident and change management process
Coordinating processes for existing network management systems
(HP Network Node Manager and Nagios)
Aligning a data reconciliation process with the Configuration Management Database (Peregrine Service Center)

Jul 2006 - Dec 2006

6 months

Ulm, Germany

Consultant

DaimlerChrysler AG, Research and Technology

Coordinating the project phases of implementation and operational setup of a communication test system (KPS) for AM/FM, GPS and GSM radio services for the new C-Class (BR 204)
Defining, building, aligning and implementing 2nd level support activities and processes based on the system architecture and ITIL between production, plant maintenance and the supplier, DaimlerChrysler Research and Technology
Coordinating further development of the communication test system for additional services, e.g. Keyless-Go, DAB, TV and SDARS
Coordinating KPS adaptation for different model series
ITIL service delivery service level management process
ITIL service support incident management process

Jan 2006 - Feb 2006

2 months

Munich, Germany

Interim Project Manager

Consulting Company

Management consulting and process optimization
Reporting to management
Assisting in the implementation to achieve outsourcing KPIs
Team leadership and recruitment
Coordination, training, and implementation of short-term control (Short Interim Control)
Defining and developing key metrics for overall equipment effectiveness (OEE) according to Six Sigma
Developing cockpit diagrams for the outsourcing targets

Jan 2003 - Dec 2005

3 years

Weßling, Germany

Senior Systems Engineer

Systems Engineering and Support Services GbR

Project coordination, reporting, design, planning, implementation, documentation, and vendor management of a global IP data network using Cisco Systems network components for the Columbus module of the International Space Station (ISS)
System development, design, planning, alignment, coordination, execution, documentation, and testing of IP networks for data and voice, including multicast applications
Developing OSPF routing concepts
Conducting pre-installation site acceptance tests
Coordinating node installations with the end customer and ESA's international partners (NASA and RSA)
Configuring and troubleshooting Cisco Systems network components (routers, switches, and firewalls)
Creating operation and maintenance concepts and contingency plans for the Cisco Systems IP network
Designing, planning, aligning, coordinating, executing, and documenting end-to-end IP acceptance tests, system tests, and load tests
Designing, planning, aligning, coordinating, executing, and documenting software acceptance tests as well as software upgrades
Coordinating all activities of the various subsystems in the ground segment of the Columbus module
Defining and aligning ground operations processes and procedures
ITIL service support processes: release, change, and problem management
ITIL service delivery processes: availability and service level management

Oct 2001 - Nov 2002

1 year 2 months

Munich, Germany

Lawful Interception Specialist

Quam Group 3G GmbH

Assessing new services with regard to lawful interception
Planning the system technical requirements for surveillance measures according to Section 88 of the Telecommunications Act
Vendor management
Coordinating surveillance planning with the postal and telecommunications regulatory authority
Technical responsibility during contract renegotiations for voicemail system software according to lawful interception requirements

Oct 2001 - Nov 2002

1 year 2 months

Munich, Germany

Operations and Maintenance Specialist

Quam Group 3G GmbH

Planning IT network management systems
Implementing HP OpenView and CiscoWorks for the Operations and Maintenance Centre in accordance with Telefónica's requirements
Preparing system technical tenders
Participating in RFI and RFQ processes
Operation and maintenance planning
Providing technical and professional support to the purchasing department during contract negotiations
Vendor management

Oct 2001 - Nov 2002

1 year 2 months

Munich, Germany

Release Manager Networks

Quam Group 3G GmbH

Project reporting and management at the director level
ITIL Service Support Process Release Management
Coordinating feasibility studies for new product requirements in the Networks area
Coordinating feasibility analyses with the relevant managers in the Networks area
Aligning all networks feasibility studies with the marketing and IT departments
Creating the Networks-Marketing-IT release process

Oct 1998 - Sep 2001

3 years

Munich, Germany

Network Planning Engineer

VIAG Interkom GmbH

BSS planning guidelines and BSC dimensioning specifications
supplier management
project management for BSS software and planning
project management of system technology upgrades and replacements
participation in system technology tenders (RfI and RfQ) and vendor negotiations for GSM/GPRS/UMTS hardware and software for BSS and UTRAN
ITIL Service Delivery process capacity management
ITIL Service Support process release and configuration management
process design and definition
internal customer management
leading technology working groups
acting on behalf of the team leader

Jul 1996 - Sep 1998

2 years 3 months

Munich, Germany

GSM Radio Network Planner

Mannesmann Mobilfunk GmbH

GSM mobile network planning according to capacity and coverage guidelines for a regional area
knowledge of system technology and planning criteria for various base stations from manufacturers Siemens and Ericsson
technical project management for a special radio network planning project at Munich Airport

Summary

Comprehensive project experience in the area of enterprise networks, regardless if wired or wireless
Specialized in wireless local area networking (WLAN) radio frequency issues
Trouble shooting of RF related issues in complex environments
Consulting, design, proof of concept, implementing, operations and trouble shooting of complex enterprise WLAN networks
WLAN site survey in all kinds of industries silos using different tools like Ekahau, Hamina, Wireshark, Sidos, Netally
Enterprise Local Area Network (LAN) experiences since 2001
Enterprise Wireless Local Area Network (WLAN) experiences since 2012
Work experience as a consultant since 2001
Proven record of successfully solving WLAN issues in complex RF environments
WLAN RF planning and optimization for office buildings, storage buildings, container terminals, fair events, factory buildings, distribution centers and high speed train coaches
Network operations of several WLCs and up to 20.000 access points in different business areas like automotive, distribution centers or fair events
AP layout planning for successful roaming for the WLAN end devices regardless of the used hardware vendor and used SSID security
WLAN planning for high density WLANs for fair events as well as for higher education, universities and public WLANs
PoC, design and implementation of Cisco Software Defined Access Networks based on Cisco Catalyst Center