VLAN Configuration in Cisco Networking

The network lab has two Catalyst 2950T24 switches, with names Maryland and California, and one Catalyst 2950G Switch with name Virginia.

All the Cisco switches has two operational modes
− User Exec Mode :
When a user first establishes the connection with the
switch, and enter the password, the switch is in ‘User
EXEC Mode’, and the prompt is ‘>’.
− Privileged Mode: when user enter the command ‘enable’ and supply the password, it enters the privileged mode, and the prompt is ‘#’
− Only in privileged mode, a user can enter configuration mode; to enter configuration mode, user must enter the command ‘config t’

A virtual LAN (VLAN) is a logical LAN, or a logical subnet.Vlan defines a broadcast domain. A physical subnet is a group of devices that shares the same physical wire. A logical subnet is a group of switch ports assigned to the same VLAN.
· Logically divide a switch into multiple, independent switches at L2· Create separate broadcast domains in a switch, increasing the number of broadcast domains· Span multiple switches using trunks
· Allow logical grouping of users by function
· Simplify adding, moving, and changing hosts in the network
· Enhance security

VLAN configuration steps:1. The VLAN must be created.
2. The VLAN may be named.
3. The desired ports must be added to the new VLAN.
Note: Routing between VLANs requires a router or Layer 3 switch.

Creating Static VLANs
There are 2 ways of create Vlans:
• Using the VLAN configuration mode, which is the recommended way to create VLANs
• Using the VLAN database mode (which should not be used but is still available)