> Here are a few quick questions about the differences between 3550-24-SMI and
> 3550-24-EMI. One vendor told me it is PERFECTLY OK to purchase 3550-24-SMI
> (at a lower cost that EMI) and upgrade same to the 3550-24-EMI which can
> then be used for CCNP/CCIE studies. I am trying to determine if there are
> any DOWNSIDES to this approach.
> * What are the main differences between 3550-24-SMI and 3550-24-EMI ?
The EMI enables a richer set of enterprise-class features, including
hardware-based IP Unicast routing (Open Shortest Path First [OSPF],
Interior Gateway Routing Protocol [IGRP], Enhanced IGRP [EIGRP], Border
Gateway Protocol Version 4 [BGPv4]), multicast routing, and policy-based
Both the SMI and the EMI allow for Layer 3 and Layer 4 lookups for QoS
The following features and functions are supported with the EMI:
* Dynamic IP routing protocols for load balancing and constructing
o IGRP and EIGRP
* Equal-cost routing for load balancing and redundancy
* Fallback bridging for forwarding of non-IP traffic between two or
* Protocol Independent Multicast (PIM) for IP multicast routing
within a network that enables the network to receive the multicast feed
requested and for switches not participating in the multicast to be
prunedsupport for PIM sparse mode (PIM-SM), PIM dense mode (PIM-DM),
and PIM sparse-dense mode
* Distance Vector Multicast Routing Protocol (DVMRP) tunneling for
interconnecting two multicast-enabled networks across nonmulticast networks
* PBR, which allows superior control by enabling flow redirection
regardless of the routing protocol configured
Quote:> * Is it OK to purchase a Catalyst 3550-24-SMI at a lower cost and upgrade
> to 3550-24-EMI for use in CCNP/CCIE Lab ?
its ok. for ccnp you dont need EMI image
Quote:> * Is it true that these two Catalyst Switches have identical hardware but
> different IOS ?
Quote:> * If I upgrade the SMI to EMI do I then have a device identical (in
> software & hardware) to an original Catalyst 3550-24-EMI ?