Custom Ethertype feature customizes the Ethernet settings in an ES20 line card. This feature enables the user to configure ethertype with outer tag for .1Q and QinQ packets. Custom Ethertype is supported for both EVCs (802.1Q and QinQ) and QinQ routed subinterfaces. By default Cisco 7600 series router supports Ethertype 0x8100 for .1Q and Q-in-Q outer tag. You can use the Custom Ethertype feature to configure the following Ethertypes for each port for ES20 line cards:
