The Cisco Services-Ready Engine (SRE) modules are router blades for the Cisco Integrated Services Routers Generation 2 (ISR G2) that provide the capability to host Cisco, third-party, and custom applications. ISM-SRE-300-K9 is supported by Cisco 1941, 2901, 2911, 2921, 2951, 3925, and 3945 Integrated Services Routers.