Hii.. here are the differences between SMI and EMI:
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SMI- The SMI image is essentially a L2 only image. In software version 121-8.EA1b, however, enhancements to the L2 feature set were made. Consequently, you may see the term Layer2+ used for this and later SMI releases. In software version 121-11.EA1, basic L3 functionality was added to the SMI image with static unicast routing, the Routing Information Protocol (RIP), and other features. Consequently, you will see the phrase basic Layer 3 routing features used for this and later SMI releases.
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EMI- The EMI image is a L2 image combined with a full L3 feature set, including Interior Gateway Routing Protocol (IGRP) and Enhanced IGRP (EIGRP), Open Shortest Path First (OSPF), Border Gateway Protocol (BGP) Version 4, Hot Standby Router Protocol (HSRP), Protocol-Independent Multicast (PIM), and other advanced services.
Hope this helps...
