From: K. Tahsin Hersan (tahsin.hersan@equant.com.tr)
Date: Thu Feb 05 2004 - 07:08:46 GMT-3
I hope this Q&A answers your question.
http://www.cisco.com/en/US/partner/products/hw/switches/ps646/products_qanda
_item09186a00800913d3.shtml
Cheers,
Tahsin
Q. What is the difference between the EMI and the SMI?
A. The Cisco Catalyst 3550-24, 3550-48, and 3550-24PWR switches can be
ordered with the SMI or the EMI. The Cisco Catalyst 3550-24-DC and
3550-24-FX can only be ordered with the SMI pre-installed, but as with all
switches running the SMI, they can be upgraded to the EMI version using an
EMI upgrade kit. The Cisco Catalyst 3550-12T and 3550-12G switches come
installed with EMI. The EMI enables a richer set of enterprise-class
features including, advanced hardware-based IP unicast and multicast
routing, Policy Based Routing (PBR) and the Web Cache Communication Protocol
(WCCP). Additional details about the differences between the SMI and EMI are
provided later in this document.
Q. Can I enable static IP routing using the SMI?
A. Yes, there is support for basic IP unicast routing via Static and
RIPv1/v2 using the SMI. The EMI provides advanced IP unicast and multicast
routing. These advanced routing protocols are Open Shortest Path Routing
Protocol (OSPF), Interior Gateway Routing Protocol (IGRP), Enhanced Interior
Gateway Routing Protocol (EIGRP), BGP version 4 (BGPv4), Protocol
Independent Multicast (PIM), and PBR.
Q. Is the EMI required to allow Layer 3 and Layer 4 lookups for QoS and
Security?
A. No. Both the SMI and the EMI allow for Layer 3 and Layer 4 lookups for
QoS and Security.
Q. Does it cost more for a Layer 3 or special-features license?
A. The Cisco Catalyst 3550-24-EMI, 3550-48-EMI, 3550-24PWR-EMI, 3550-12T,
and 3550-12G are loaded with the EMI, so all feature license fees are part
of the standard list price. However, the Cisco Catalyst 3550-24-SMI,
3550-48-SMI, 3550-24PWR-SMI, 3550-24-DC-SMI, and 3550-24-FX-SMI switches are
loaded with the SMI; these switches can be upgraded to the EMI with the
purchase of the EMI upgrade kit (part number CD-3550-EMI=).
Q. What features are only supported on the EMI?
A. The following features and functionality are only supported with the EMI:
Advanced IP routing protocols for load balancing and constructing scalable
LANs:
Open Shortest Path First (OSPF)
IGRP and Enhanced IGRP (EIGRP)
Border Gateway Protocol (BGP) version 4
WCCP to allow switch interaction with a cache for the purpose of redirecting
content requests to a cache and performing basic load balancing across
multiple caches
PBR to allow specific policies to be implemented by causing selective
traffic to take different paths
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 pruned-support 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 non multicast networks
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Tom
Young
Sent: Thursday, February 05, 2004 8:10 AM
To: ccielab@groupstudy.com
Subject: difference between Cat3550 EMI and SMI
Hi, group
I really need a link or a document for the topic
questin, who can provide it for me ?
Thanks alot
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