here are basic cisco router configuratuion commands you will need to fully understand before going to Routing protocols topics:
Basic configuration
Router>ena
Router#show version
Router#show start
Router#show run
Router#show history
Router#show clock
Router#show users
Router#show flash
Router#show tech-support
Router#show interfaces
Router#show ip interface brief
Router#copy run start
Router#ping
Router#reload
Router#show version
Router#show start
Router#show run
Router#show history
Router#show clock
Router#show users
Router#show flash
Router#show tech-support
Router#show interfaces
Router#show ip interface brief
Router#copy run start
Router#ping
Router#reload
Router#config t
Router(config)#ip host yasser 10.0.0.100
Router(config)#interface fastEthernet 0/0
Router(config-if)#ip address 10.0.0.1 255.0.0.0
Router(config-if)#speed auto
Router(config-if)#duplex auto
Router(config-if)#no shutdown
Router(config-if)#exit
Router(config)#ip host yasser 10.0.0.100
Router(config)#interface fastEthernet 0/0
Router(config-if)#ip address 10.0.0.1 255.0.0.0
Router(config-if)#speed auto
Router(config-if)#duplex auto
Router(config-if)#no shutdown
Router(config-if)#exit
Secure Router & Setting Telnet connection
Router(config)#enable password 1111
Router(config)#no enable password
Router(config)#enable secret 1111
Router(config)#line console 0
Router(config-line)#password 2222
Router(config-line)#login
Router(config-line)#exit
Router(config)#line vty 0 4
Router(config-line)#password 3333
Router(config-line)#login
Router(config-line)#exit
Router(config)#service password-encryption
Router(config)#banner motd # dont login #
Router(config)#username yasser password 2222
Router(config)#username yasserramzy secret 2222
Router(config)#username yasserauda privilege 15 password 2222
Router(config)#username yasserramzyauda privilege 15 secret 2222
Router(config)#no ip domain-lookup
Router(config)#no enable password
Router(config)#enable secret 1111
Router(config)#line console 0
Router(config-line)#password 2222
Router(config-line)#login
Router(config-line)#exit
Router(config)#line vty 0 4
Router(config-line)#password 3333
Router(config-line)#login
Router(config-line)#exit
Router(config)#service password-encryption
Router(config)#banner motd # dont login #
Router(config)#username yasser password 2222
Router(config)#username yasserramzy secret 2222
Router(config)#username yasserauda privilege 15 password 2222
Router(config)#username yasserramzyauda privilege 15 secret 2222
Router(config)#no ip domain-lookup
Cisco DISCOVERY PROTOCOL
Router(config)#cdp run
Router#show cdp neighbors
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone
Device ID Local Intrfce Holdtme Capability Platform Port ID
Switch Fas 0/1 171 S 2960 Fas 0/1
Router Fas 0/0 122 R C2800 Fas 0/0
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone
Device ID Local Intrfce Holdtme Capability Platform Port ID
Switch Fas 0/1 171 S 2960 Fas 0/1
Router Fas 0/0 122 R C2800 Fas 0/0
Router#show cdp interface
Vlan1 is administratively down, line protocol is down
Sending CDP packets every 60 seconds
Holdtime is 180 seconds
FastEthernet0/0 is up, line protocol is up
Sending CDP packets every 60 seconds
Holdtime is 180 seconds
FastEthernet0/1 is up, line protocol is up
Sending CDP packets every 60 seconds
Holdtime is 180 seconds
Vlan1 is administratively down, line protocol is down
Sending CDP packets every 60 seconds
Holdtime is 180 seconds
FastEthernet0/0 is up, line protocol is up
Sending CDP packets every 60 seconds
Holdtime is 180 seconds
FastEthernet0/1 is up, line protocol is up
Sending CDP packets every 60 seconds
Holdtime is 180 seconds
Router#show cdp entry *
Device ID: Switch
Entry address(es):
Platform: cisco 2960, Capabilities: Switch
Interface: FastEthernet0/1, Port ID (outgoing port): FastEthernet0/1
Holdtime: 148
Version :
Cisco IOS Software, C2960 Software (C2960-LANBASE-M), Version 12.2(25)FX,
RELEASE SOFTWARE (fc1)
Copyright (c) 1986-2005 by Cisco Systems, Inc.
Compiled Wed 12-Oct-05 22:05 by pt_team
advertisement version: 2
Duplex: full
---------------------------
Device ID: Router
Entry address(es):
IP address : 120.0.0.2
Platform: cisco C2800, Capabilities: Router
Interface: FastEthernet0/0, Port ID (outgoing port): FastEthernet0/0
Holdtime: 158
Version :
Cisco IOS Software, 2800 Software (C2800NM-ADVIPSERVICESK9-M), Version
12.4(15)T1, RELEASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2007 by Cisco Systems, Inc.
Compiled Wed 18-Jul-07 06:21 by pt_rel_team
advertisement version: 2
Duplex: full
Device ID: Switch
Entry address(es):
Platform: cisco 2960, Capabilities: Switch
Interface: FastEthernet0/1, Port ID (outgoing port): FastEthernet0/1
Holdtime: 148
Version :
Cisco IOS Software, C2960 Software (C2960-LANBASE-M), Version 12.2(25)FX,
RELEASE SOFTWARE (fc1)
Copyright (c) 1986-2005 by Cisco Systems, Inc.
Compiled Wed 12-Oct-05 22:05 by pt_team
advertisement version: 2
Duplex: full
---------------------------
Device ID: Router
Entry address(es):
IP address : 120.0.0.2
Platform: cisco C2800, Capabilities: Router
Interface: FastEthernet0/0, Port ID (outgoing port): FastEthernet0/0
Holdtime: 158
Version :
Cisco IOS Software, 2800 Software (C2800NM-ADVIPSERVICESK9-M), Version
12.4(15)T1, RELEASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2007 by Cisco Systems, Inc.
Compiled Wed 18-Jul-07 06:21 by pt_rel_team
advertisement version: 2
Duplex: full
Password recovery
1- connect your router using console cable
2- turn off turn on your router
3- press ctrl + pause break
4- change confreg to 0x2142
5- reset
6- n
7- ena
8- copy start run
9- config t
10- use password commands to change or remove passwords
11- confgire-register 0x2102
12- exit
13- copy run start
2- turn off turn on your router
3- press ctrl + pause break
4- change confreg to 0x2142
5- reset
6- n
7- ena
8- copy start run
9- config t
10- use password commands to change or remove passwords
11- confgire-register 0x2102
12- exit
13- copy run start
BACKUP & RESTORE
Router#copy tftp flash
Router#copy flash tftp
Router#copy run tftp
Router#copy start tftp
Router(config)#boot system flash ?
WORD System image filename
Router#copy flash tftp
Router#copy run tftp
Router#copy start tftp
Router(config)#boot system flash ?
WORD System image filename
note: Boot priority (system,flash,tftp,rxboot.rommon)
DHCP
Router(config)#ip dhcp pool me
Router(dhcp-config)#network 10.0.0.0 255.0.0.0
Router(dhcp-config)#default-router 10.0.0.10
Router(dhcp-config)#dns-server 10.0.0.11
Router(dhcp-config)#exit
Router(config)#ip name-server 10.0.0.11
Router(config)#ip dhcp excluded-address 10.0.0.100 10.0.0.200
Router(config)#exit
Router(dhcp-config)#network 10.0.0.0 255.0.0.0
Router(dhcp-config)#default-router 10.0.0.10
Router(dhcp-config)#dns-server 10.0.0.11
Router(dhcp-config)#exit
Router(config)#ip name-server 10.0.0.11
Router(config)#ip dhcp excluded-address 10.0.0.100 10.0.0.200
Router(config)#exit
Router#show ip dhcp binding
IP address Client-ID/ Lease expiration Type Hardware address
IP address Client-ID/ Lease expiration Type Hardware address
Router(config)#interface fastEthernet 0/0
Router(config-if)#ip address dhcp
Router(config-if)#ip address dhcp
SSH
Router(config)#username yasser password 2222
Router(config)#hostname alexrouter
alexrouter(config)#ip domain-name me.com
alexrouter(config)#ip ssh time-out 30
alexrouter(config)#ip ssh authentication-retries 3
alexrouter(config)#ip ssh version 2
Please create RSA keys (of at least 768 bits size) to enable SSH v2.
alexrouter(config)#crypto key generate rsa
The name for the keys will be: alexrouter.me.com
Choose the size of the key modulus in the range of 360 to 2048 for your
General Purpose Keys. Choosing a key modulus greater than 512 may take
a few minutes.
How many bits in the modulus [512]: 512
% Generating 512 bit RSA keys, keys will be non-exportable...[OK]
*Mar 1 0:1:26.828: RSA key size needs to be at least 768 bits for ssh version 2
*Mar 1 0:1:26.828: %SSH-5-ENABLED: SSH 1.5 has bee
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