Leon Tu Email & Phone Number

Houston, Tx, Us

Houston, Tx, Us

• Manage and support corporate infrastructure with Cisco, Meraki, and Fortinet device. • Participate in (24/7) on call rotation to handle outages.• Assist with re-designing current network and integrating Fortinet security and SDWAN to meet with TSA guideline.• Assist with implementing of network separation to provide Internet for Business network while isolating and securing Operation network from potential threats.• Troubleshooting and resolving MPLS, VSAT and Cellular circuits issue at data center and or remote site.• Assist with moving, racking/stacking and configuring of Fortinet and Cisco device to prepare new data center as well as decommissioning old data center for infrastructure change.• Create low and high levels design of LAN/WAN using Microsoft Visio.• Maintain and manage corporate Wi-Fi through Cisco wireless controller as well as upgrading and deploying Meraki access point to provide security using LDAP authentication.• Take lead in configurating and templatizing profiles in Forti Manager to pre-configure device before deploying to remote site.• Create documentation and procedure for site conversion and equipment deployment to provide a smoother transition.• Work with remote tech to troubleshoot existing network as well as migrating legacy network/equipment to a newer and more secure platform.• Monitor, manage and maintain LAN/WAN using SolarWinds and Forti Manager/Forti Analyzer.• Work with SysAdmin and SCADA team to troubleshoot any application or communication issue within firewall routing or security policy.• Maintain and manage corporate communications through Cisco Unified Communications and Microsoft Teams Admin portal.• Work with ISP to troubleshoot and resolve any circuit failure.• Resolving user issue through ServiceNow ticketing system.

Madrid, Madrid, Es

• Redesign legacy network configuring and implementing SDWAN using all available circuit including MPLS technology to provide high availability and redundancy.• Creating low and high levels design of LAN/WAN using Microsoft Visio.• Monitor, manage and maintain LAN/WAN using SolarWinds.• Troubleshoot routing and tunneling issue with Cisco ASA and layer 3 switches.• Resolving user issue through ServiceNow ticketing system.• Configure, deploy, and maintain Aruba wireless access point through Aruba Central.• Troubleshoot Cisco CUCM and voice gateway issue.• Configuring and test failover between Cisco layer 3 switch, ASA firewall and ASR 4300 router.• Configure, deploy, and maintain Cradlepoint LTE through Netcloud.• Creating procedure and documentation for network troubleshooting, failover, and SDWAN project to maintain company standardization.

Houston, Tx, Us

• Collaborate among IT department to manage and maintain customer network infrastructure and VOIP. • Troubleshoot with field technicians and or customer to restore faulty network in the most effective, and timely manner. • Troubleshooted Grand stream, yealink and Cisco phones• Configured Ether channels, Trunks to carry multiple VLAN information, VLAN's to reduce broadcast information, STP modes for loop prevention and VTP to synchronize vlan information on multi-layer switch 3650 for inter-vlan.• Worked on cisco unified communication products call processing agents (CUC, CUCM) voice mail applications.• Design, configured, implement, and troubleshoot Velocloud SD-WAN network solutions from 510 model up to 3400 series.• Configured VLAN's, Trunking protocols, VTP to synchronize VLAN information on client mode switches, STP for loop prevention and inter- vlan on multi-layer switch and configured dedicated VLAN's for voice and data prioritizing VOICE over DATA so that voice packets are not dropped.• Configured, managed, and maintained Meraki cloud solutions.• Upgraded 2811 cisco routers with voice IOS and firmware to support the SCCP ip phones and configured router as DHCP to assign IP's and registration of ip phones.• Configured and managed cradle point cellular as backup circuits.• Prioritize and work trouble ticketing system to resolve customer’s issue without causing delay or disrupting their business.• Worked on implementing and troubleshooting informcast server and paging devices.

Houston, Tx, Us

Houston, Tx, Us

Houston, Tx, Us

Southlake, Tx, Us