Would someone mind clarifying how the SMI and EMI images work on 3750 switches? I have read the following in the 3750 software installation guide:
The Catalyst 3750 switches are shipped with either of these software images installed:
=B7 Standard multilayer image (SMI), which provides Layer 2+ features (enterprise-class intelligent services). These features include access control lists (ACLs), quality of service (QoS), static routing, and the Hot Standby Router Protocol (HSRP) and the Routing Information Protocol (RIP). Switches with the SMI installed can be upgraded to the EMI.
=B7 Enhanced multilayer image (EMI), which provides a richer set of enterprise-class intelligent services. It includes all SMI features plus full Layer 3 routing (IP unicast routing, IP multicast routing, and fallback bridging). To distinguish it from the Layer 2+ static routing and RIP, the EMI includes protocols such as the Enhanced Interior Gateway Routing Protocol (EIGRP) and the Open Shortest Path First (OSPF) Protocol.
We have been purchasing both EMI and SMI switches for use in the same stack. We have been using the "arc copy-sw" command to synchronise IOS versions across the switches.
Does this mean we have been copying EMI images onto SMI switches? Or vice versa? Am I confusing images with IOS versions? Are they the same thing?