3 router basics and inital configurations
TRANSCRIPT
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Introduction to Router&
Initial Configurations
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Lesson Objectives
Fundamentals concepts of Routers
Router Memories and Boot sequence
Interfaces of Router
IOS modes of the router
Initial configurations on Router in IPv6
domain
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Router fundaments
The router is a device that inter connects differentnetworks
It comes from the word ROUTE
A router accepts packets on at least two networkinterfaces and forwards packets from one interface
to another.
Router works at network layer.
Each router maintains a database called routing
table of the router
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Router fundamentals
Router is like a PC and has
Mother board
CPU Memory
Ports & interfaces to hook peripherals
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CISCOs HIERARCHICAL DESIGN MODEL
Access Layer : Small organization
Ex:1600,1700,1800,2500 series
Distribution Layer: Medium size organizationex: 2600,2800,3600,3700,3800
Core layer : Very large organizations and
ISPs.ex:7200,7600,10000,12000
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Cisco Router Memories
Memory Type Contents
RAM Active program & operating system
instructions
Running configuration files Routing tables
NVRAM Startup configuration files
ROM POST (Power-On-Self-Test)
Startup/Power-up utilities
Flash IOS
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Boot sequence
Power on self-test checks the hardware The ROM loads the bootstrap program and
searches for the IOS
IOS from flash is loaded
The startup configuration is loaded from the
NVRAM
Boot process is completed as all the configfiles are loaded into the RAM
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Interfaces of routers
LAN Interface to connect to the switch
WAN Interface to connect to the next router
(serial port) Administrative port (console port)
Auxiliary port
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IOS MODES
1. User Mode:
Router>
Router is the default host name '>' symbolimplies "user mode".
This is the first mode user interacts with the
IOS. It is a restricted mode and support only
a very few basic commands.
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IOS MODES
2. Privilege Mode:
Router#
'#' symbol implies "Privilage Mode".
This mode has full administrative rights.
This mode is generally used for advanced
troubleshooting using 'show' and 'debug'
command.
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IOS MODES
3. Global Configuration mode:
Router (config)#
'(config)# symbol implies "global
configuration mode".
Configuration of the router starts from this
mode configurations that affect the complete
router are given.
Example: host name of the router.
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IOS MODES
4. interface configuration mode:
Router(config-if)#
'(config-if)# symbol implies "interface configuration mode".This mode is used to configure a specific interface.
5. Line configuration mode:
Router(config-line)#
'(config-line)# symbol implies "Line configuration mode".This mode is used to configure telnet, console and auxiliarymode.
6. Router Mode:Router(config-router)#
'(config-router)#'symbol implies "Router mode". This modeis used to configure different dynamic routing protocol.
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ANY QUESTIONS ?????
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M.DEVI PRASAD, JTO
9490118909
mailto:[email protected]:[email protected]:[email protected]