A method and apparatus for a router to inform a Layer 2 switch by use of packets of a new router group port management protocol that the layer 2 switch is to forward multicast packets of a specified group to the router. A heat treatment apparatus is provided with susceptors, i. The present invention provides a condylar-head replacement comprising a condylar-head attachment that may be adjustably positioned on a reconstruction plate to achieve various condylar-head heights. The optical element is made of a plastic material which is comparatively inexpensive. Each reinforcement member includes upper and lower mounting features, wherein the upper mounting features are supported on the upper edge of the belt reinforcement and the lower mounting features are mounted on the body portion of the belt reinforcement. A wash-out hook-up valve is provided to control the flow of fluid between the body and the wash-out hook-up.