As Mobile IPv6 (MIPv6) networks are being deployed, traffic measurement meets several challenges such as monitoring handover events, detecting tunneled IPv6 traffic, and classifying MIPv6 packets with the extension headers. However, typical traffic monitoring methods used in the plain IP network cannot be applied to MIPv6 networks. Hence, this paper proposes a new traffic monitoring mechanism suitable for a MIPv6 network. For this purpose, we used the IP Flow Information eXport (IPFIX) standard for monitoring MIPv6 access routers, and extended IPFIX templates that can carry MIPv6-specific information such as MIPv6 handover messages and IPv6-in-IPv6 tunneled flows. Thus, IPv6 data traffic, MIPv6 handover events, and tunneled IPv6 traffic could be monitored from multiple MIPv6 routers.