Cisco VLAN Setup – Cisco Configuration Step By Step Part 1 – Creating VLANs
VLANs and Trunks for Beginners
This is our first video in a series of videos that will talk about the configuration of VLANs on Cisco switches.
When you think of a LAN, you normally think of PCs, servers, printers and network devices all connected together in the same geographical location such as one floor in a building. What you would expect to find at the center of this LAN is a switch. By default, all devices connected to this switch can communicate with each other and all of them see broadcasts sent by any other device connected to the switch. In other words, all devices connected to the switch are part of one broadcast domain.
Before VLANs we would separate broadcast domains with a router. With VLANs we can logically separate the switch into multiple broadcast domains. For example, your servers may send broadcasts that only need to be seen by other servers. You could put your servers in their own VLAN so PCs do not have to see those broadcasts. This is just one example use for a VLAN but there are other ways VLANs can be useful.
Another useful feature of VLANs is that they group machines logically instead of geographically. Suppose you had machines in different locations that need to be on the same LAN. Without VLANs, you would have to physically move the machines to the same location. With the flexibility of VLANs, you can leave the machines in separate locations because VLANs can span across switches and group machines logically instead of geographically.
Cisco VLAN Configuration Part 1 – Creating VLANs
Cisco VLAN Configuration Part 2 – Trunking and DTP
Cisco VLAN Configuration Part 3 – Router on a Stick
Cisco VLAN Configuration Part 4 – SVI