Thursday, November 21, 2013

Step By Step Cisco Router Configuration (Introduction II)

Ok. Before we start configure the router.
First of all, I want to explain about router.
What is router?
Router is a computer.
Router had a working process like a computer but a difference is Router only work from Layer 1 s/d Layer 3.
A computer work on Layer 7.
Well First I will describe about Router Component.
-CPU: Central Process Unit -> to do the process which mean the main core like brain in human body.
-ROM: Read Only Memory -> to save bootstrap program and scaled down IOS version, performing POST (same function with BIOS in PC)
-RAM: Random Access Memory -> for temporary memory
-NV-RAM -> to save configuration permanently
-Flash: -> to save IOS (same function with Harddisk in PC)
Now i will explain how the process in Router boot-up:
- Router will performing POST (Power On Self Test) to ensure that the hardware is on or not.
- After that load bootstrap program (Program that running the program which more bigger, load program into RAM)
- Locate and loading IOS
when locate, it will search in Flash. If in flash didn’t contain IOS, it will search in TFTP Server. If in TFTP Server didn’t have, it will scaled down IOS version.
- Locate and loading startup Configuration File.
when locate, it will search in NV-RAM. If in NV-RAM didn’t contain Configuration File, it will search in TFTP Server. If in TFTP server didn’t have, it will prompt Setup Mode.
Principe Routing Table
1.Every router had to make a self decision based on Routing table information
2.Routing table information in every router not necessarily same
3.Information about some way is n0t consist information about return path
You also must know about metric.
Metric is unit measurement for the software.
EIGRP using Bandwith for the metric. RIP using Hop for the metric.
Next we will start to know what is routing static and the example case for routing static.
Hope u enjoy it.


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