Starting off first allows the use of a flat network definition. Flat network design network is a network engineer do not daisy chain hubs together with the knowledge of and/or switches to create a single large network includes hundreds of, if not tens of thousands of devices in a single subnet.
From a design point of view it was broadcast and control traffic can overwhelm the network crazy bad idea. In real-world production of multiple access network (such as Ethernet and you will find when you take the previous host for a given subnet 400+, can degrade network performance. 24 is the most common network size would solve the 254 available host IP address, subnet mask.
So how to create a network larger then 400+ node? Answer is actually quite simple 4 letter abbreviation is called VLAN. The most simple terms partition physical virtual local area network switch into multiple independent local area network so that traffic on a VLAN cannot communicate with another VLAN traffic unless it does a router. As a 2nd tier network isolation, can easily explain the VLAN and the 3rd layer of isolation as a subnet will be discussed at the 6th Festival.
To create a layer 2 VLAN control are the key factors in a given network segment size, in order to broadcast and control traffic and exposure in a given network segment.
Free CCNA SW1 Binder GNS3 topology processing, please keep in mind that SW2 and SW3 NM 16ESW switch module with Cisco 3,640 series routers. Of this switch module configuration, the Cisco Catalyst series switches. Router to configure VLAN nm -16ESW module installed, you will need to create a VLAN in the VLAN database configuration mode. Keep in mind that the VLAN database configuration mode is now depreciated in newer Cisco switches and Cisco IOS software on the exchangers create VLAN global configuration mode using the VLAN# name VLAN_NAME command now.
In addition please note that verifying NM 16ESW switch configuration commands are slightly different, and then the catalyst switch running Cisco IOS. Recommended buying Cisco Catalyst switches 2950 g, or preferably 3,550 in order to familiarize yourself with command on the Catalyst converter.
In this lab, you will familiarize yourself with the following command;
Lab Objectives:
- SW1, create 3 VLAN. To name the sales VLAN 10, VLAN 20 and name development, marketing of VLAN 30.
- Port Fa0/1 is assigned to VLAN 10, interface Fa0/3 interface Fa0/2 is assigned to VLAN 20 and be assigned to a VLAN 30. , You validate your configuration.
Lab Instruction:
Step 1. About the SW1, create 3 VLAN. To name the sales VLAN 10, VLAN 20 and name development, marketing of VLAN 30.
To accomplish this goal using GNS3, you need to navigate to the VLAN database configuration mode use the VLAN database command in privileged mode. You can use VLAN in the VLAN database configuration mode number name vlan_name command to create a VLAN.
SW1 con0 is now available
Press RETURN to get started.
SW1>enable
SW1#config terminal
Enter configuration commands, one per line. End with CNTL/Z.
SW1(config)#vlan 10
SW1(config-vlan)#name Sales
SW1(config-vlan)#vlan 20
SW1(config-vlan)#name Development
SW1(config-vlan)#vlan 30
SW1(config-vlan)#name Marketing
SW1(config-vlan)#end
SW1#
Step 2. Assign port Fa0/1 to VLAN 10, the interface Fa0/2 is assigned to VLAN 20, and interface Fa0/3 is assigned to VLAN 30. , Please verify your configuration.
To a specific VLAN configuration switch port interface in the interface configuration mode using the switch port access VLAN# command. VLAN configuration you want to verify your user or privileged mode on Catalyst series switches as follows NM16 ESW configured on the Cisco Catalyst series switches or displays the VLAN, use the show VLAN switch.
SW1#configure terminal
SW1(config)#interface Fa0/1
SW1(config-if)#switchport access vlan 10
SW1(config-if)#interface Fa0/2
SW1(config-if)#switchport access vlan 20
SW1(config-if)#interface Fa0/3
SW1(config-if)#switchport access vlan 30
SW1(config-if)#end
SW#show vlan
VLAN Name Status Ports
---- ---------------------------- --------- -------------------------------
1 default active Fa0/4, Fa0/5, Fa0/6, Fa0/7
Fa0/8, Fa0/9, Fa0/10, Fa0/11
Fa0/12, Fa0/16, Fa0/17, Fa0/18
Fa0/19, Fa0/20, Fa0/21, Fa0/22
Fa0/23, Fa0/24, Gi0/1, Gi0/2
10 Sales active Fa0/1
20 Development active Fa0/2
30 Marketing active Fa0/3
1002 fddi-default act/unsup
1003 token-ring-default act/unsup
1004 fddinet-default act/unsup
1005 trnet-default act/unsup
SW1#
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