- Port High-Density Gigabit or 1-Port 10 Gigabit Ethernet WAN Service Module
- Expansion module
- enhanced service module (SM-X)
- combo Gigabit SFP x 4 + 10 Gigabit SFP+ x 1
- for Cisco 4451-X; Integrated Services Router 4331
The ports on these modules 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 supported. 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 these modules.