Cisco SM-X-6X1G Gigabit Ethernet Service Module brings high density Small Form-Factor Pluggable (SFP) and copper (RJ-45) Gigabit Ethernet (GE) connectivity to the Cisco 4400 series Integrated Services Routers (ISRs). It accelerates applications such as Ethernet WAN access, inter-VLAN routing, and high-speed connectivity to LAN switches and servers and provides maximum flexibility. The ports on the Cisco SM-X-6X1G Service Module work as routed Layer 3 ports. Layer 2 switching between local ports on the module or between ports on the module and other ports within the router system is not possible. The port terminates Layer 2 trunks from externally connected switches, and Layer 2 trunk and VLAN information is not switched onto other ports in the system. The host router routes all traffic entering the Cisco SM-X-6X1G.