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How to Identify Standard Multilayer Image& Enhanced Multi-layer Image on L3 switch

The 3550 is either a Layer 2 (L2) or Layer 3 (L3) switch, which depends on the software version and feature set that you install.

The naming conventions for 3550 images begin with either of these:

show version command in order to verify these items:

• The version of software that you run
  
• The location of the image installation
  
• The feature set that you run
  
• The 3550 model that you have
  

Here is a sample command output:

3550# show version
Cisco Internetwork Operating System Software
IOS (tm) C3550 Software (C3550-I5Q3L2-M), Version 12.1(12c)EA1, RELEASE SOFTWARE
 (fc1)

!--- The "I5Q3L2" at the start of the image name tells
!--- you that this image is an EMI.
!--- If you see "I9Q3L2" instead, the name means that you
!--- run an SMI.
!--- The version of software that you currently run is
!--- Cisco IOS Software Release 12.1(12c)EA1.

Copyright (c) 1986-2002 by cisco Systems, Inc.
Compiled Mon 25-Nov-02 00:07 by antonino
Image text-base: 0x00003000, data-base: 0x0075FE48
ROM: Bootstrap program is C3550 boot loader
3550 uptime is 2 weeks, 1 day, 3 hours, 0 minutes
System returned to ROM by power-on
System image file is "flash:c3550-i5q3l2-mz.121-12c.EA1/c3550-i5q3l2-mz.121-12c.
EA1.bin"

!--- The image is in the flash/c3550-i5q312-mz.121-12c.EA1 directory.


!--- Output suppressed.

Model revision number: 03
Motherboard revision number: 03
Model number: WS-C3550-24PWR-SMI

!--- This is a WS-C3550-24PWR-SMI.
!--- Notice the "SMI" at the end of the model number.
!--- This factory configuration does not change,
!--- even if you upgrade to an EMI.

System serial number: CSJ0644U00Y
Configuration register is 0x10F
3550#

What is the differences between Cisco Enhanced Multi-layer Image & Standard Multilayer Image?

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.

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.

What does the EIGRP stuck in active message mean?

When EIGRP returns a stuck in active (SIA) message, it means that it has not received a reply to a query. EIGRP sends a query when a route is lost and another feasible route does not exist in the topology table. The SIA is caused by two sequential events:

1.The route reported by the SIA has gone away.

2.An EIGRP neighbor (or neighbors) have not replied to the query for that route.

When the SIA occurs, the router clears the neighbor that did not reply to the query. When this happens, determine which neighbor has been cleared. Keep in mind that this router can be many hops away.

Internetworking basics-1

Q - Describe the process of routing packets.

A - Routing is the act of moving information across an internetwork from a source to a destination.

Q - What are some routing algorithm types?

A - Static, dynamic, flat, hierarchical, host-intelligent, router-intelligent, intradomain, interdomain, link-state, and distance vector.

Q - Describe the difference between static and dynamic routing.

A - Static routing is configured by the network administrator and is not capable of adjusting to changes in the network without network administrator intervention. Dynamic routing adjusts to changing network circumstances by analyzing incoming routing update messages without administrator intervention.

Q - What are some of the metrics used by routing protocols?

A - Path length, reliability, delay, bandwidth, load, and communication cost.

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CBT Nuggets for CCNA

A Run-from-the-CD Training Video for the CCNA exam.
Uses Active X Controls and probably the IE6 engine.
PARs to check image
RARs to extract image
Burn or Mount and Enjoy

Download Here