Configuring a Router

Configuring a Router 


 At the Router confuguration time take a router when you don't know .wht configuration is in router.it's previously used or not.configuration saved or not or it's blank and new for solution all these question here there are some cisco command for showing the status of the network devices router & Switch .at any point of configuration point try out the following commands:

Router#show interfaces  //it will shows all set Configured or non configurated information
Router#showip protocols //  Sh ip informatiion 
Router#showip route  // Show Possible route connected
Router#showiparp   // Sh MAC Information from Ip Address.

Router#show interfaces  //it will shows all set Configured or non configurated information

Router#showip protocols //  Sh ip informatiion 

Router#showiparp   // Sh MAC Information from Ip Address.

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Network Cables Color code

Straight Cable Cable (Ethernet Cable color code)

(1)orange white
(2)orange
(3)green white
(4)blue
(5)blue white
(6)green
(7)Brown
(8)Brown white

Cross Cable

Green white
green
orange white
blue
blue white
orange
Brown
Brown white

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Wireless LAN Standards and Authentication-For Secure wireless Network

 Wireless LAN Standards and Authentication

   The WLAN standards & applying methods.Standards that Fallow set of rules &

   provide security for wireless networks .it’s one types of algorithms Designed.it 

   gives uniq identity to it’s users & secure the wireless network.

    Wired Equivalent Privacy (WEP)

    Wi-Fi Protected Access (WPA)

    Wi-Fi Protected Access 2 (WPA2) or 802.11i .

See Vedio tutorial to how to apply WEP.

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Assigning a trunk port to Switch & Router in beetween.

Assigning a trunk port to Switch & Router in beetween.

here we configured 0/2 as trunk port. in inter vlan routing talking, there are
 some encapsulation methods. no 1. is 802.1Q or dot1q  and 2 is ISL it's Ciso proprietary
  only for Cisco devices while  802.1Q or dot1q  for supports
    the multi-vendor encapsulation method.

here we taken cisco 2950 switch that  support dot1q Encapsulation method

Next is to define the native VLAN and if you want to, you can define which
VLANs are allowed to cross that trunk port, See below command

C2950 (config-if)# switchport trunk native vlan 2
C2950 (config-if)# switchport trunk allowed vlan add  2, 3, 4, 5

 Assign Switch ports to Vlan by command

C2950 (config)# interface fa0/2
C2950 (config-if)# switchport mode access
C2950 (config-if)# switchport access vlan 2

      we can assign switch port individual
like this,when they are not in sequential order
C2950 (config)# interface range fa0/1 - 5, fa0/1 - 15, fa0/24

their is another way when more than one ports we want to assign the same vlan the ,fallowing comming
the command syntax is  "interface first port no-last port no ".

C2950 (config)# interface range fa0/2 - 6
C2950 (config-if-range)# switchport mode access
C2950 (config-if-range)# switchport access vlan 2

Assign switch port 0/6 to 0/12 to vlan 3

C2950 (config)# interface range fa0/6 - 12
C2950 (config-if-range)# switchport mode access
C2950 (config-if-range)# switchport access vlan 3

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InterVLAN routing Configuration

 InterVLAN routing Configuration

configuration they will talk or tranfrer data connected to all devices in same switch or in network.

but when in switch we create vlan then divided in to subdomain or subnetworks so without any 

By defaultin swithc there are one vlan and it's all ports are in same vlan so without any 

layer three device two diffrent vlant can not tranfer information or talk each other also they cant 

transfer information in other network.thay only can talk or transfer information which is in 

same vlan or same sub twork.

here we r doing inter vlan routing.Configuration of router for interVLAN routing 

   for when we wannt to talk 2 different vlan in network then intervlan routing is needed.

 appropriate VLANs back through the same line.

the packet goes to router first and the router will route the packets to the

For now lets configure the router to do interVLAN routing.

here we have cisco 2600 series router.it's have by default 2 ethernet interface

so we can connect through that port to our cisco switch.in on that port we devided in to

 sub interfaces  ,each interface for each vlan sapretely.we will give also sapret ip addresses 

to each interface,there are no need to give ip address on main interface .

  subinter face is  one port can be logically devided into many sub interfaces.

Each sub interface will handle one VLAN/subnet.

here we need to assign VLAN first on the sub interface, after that give IP 

address .no need to give IP address to main interface ethernet 0/0 but do not forget to give 

command no shut , the sub interfaces will automatically apply the same no shutdown.

here's how we configure them:

router> enable

router2600# configure terminal

router 2600(config)# interface ethernet0/0

router 2600(config-if)# no ip address

router 2600(config-if)# no shutdown

router 2600(config-if)# interface ethernet0/0.1

router 2600(config-subif)# encapsulation dot1q 2

router 2600(config-subif)# ip address 10.100.2.1 255.255.255.0

router 2600(config-subif)# interface ethernet0/1.2

router 2600(config-subif)# encapsulation dot1q 3

router2600 (config-subif)# ip address 10.100.4.1 255.255.255.0

router 2600(config-subif)# interface ethernet0/1.3

router 2600(config-subif)# encapsulation dot1q 4

router 2600(config-subif)# ip address 10.100.6.1 255.255.255.0

router 2600(config-subif)# interface ethernet0/1.5

router 2600(config-subif)# encapsulation dot1q 5

router 2600 (config-subif)# ip address 10.100.8.1 255.255.255.0

router 2600 (config-subif)#exit

router 2600 (config-t#exit

router 2600#wr

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Now Assigning a trunk port to Switch & Router in beetween.

To configure the trunk port to connect to the router and for accessing Data,

The trunk is needed to carry all VLANs or selected VLANs Data trafrering 

beetween all switches connected with the same networks.here we configure the 

FastEthernet port 0/2 of switch 2950 to routere's fa0/0 as a trunk  port & Trunk

 link that connects Each other.

C2950> enable
C2950# configure terminal
C2950 (config)# interface fa0/2
C2950 (config-if)# switchport mode trunk

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Creating Vlan With Cisco 2950

In Networking the term Vlan,it's a  Broadcast domain we all know wht is the use of vlan.now i here i give below how to configure & vlan and intervlan routing labs.here i taken on cisco 2950.it's managable switch,now, in switch we assume that it's initially configured like,vty terminal ,line consol 0 end .so now  here,we create some vlan here. Managment,sells,marketing and it.

C2950> enable
C2950# configure terminal
C2950 (config)# vlan 2
C2950 (config-vlan)# name MANAGEMENT
C2950 (config-vlan)# vlan 3
C2950 (config-vlan)# name sells
C2950 (config-vlan)# vlan 4
C2950 (config-vlan)# name Marketing
C2950 (config-vlan)# vlan 5
C2950 (config-vlan)# name it

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