Harold Ritter is a technical leader with Cisco Advanced Services. He is responsible for helping Cisco top tier Service Provider customers to design, implement and troubleshoot routing protocols, multicast and MPLS solutions for both IPv4 and IPv6. He is a regular contributor to CiscoLive, Cisco Support Forums and to the CCIE and CCDE programs. He has more than 20 years of experience as a network engineer and has been working with IPv6 since 2003. Harold is a CCIE (#4168) for Routing & Switching and Service Provider.