regarding VLANS & tagging

10 pts.
Tags:
Frame Tagging
VLAN
VLAN configuration
VLAN Tagging
how to configure vlans & trunk
ASKED: July 5, 2009  4:00 PM
UPDATED: July 6, 2009  12:34 PM

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VLANs, trunks and tagging are all related. As you probably know a VLAN defines a broadcast domain, trunks allows vlans to travel from switch to switch and taggings either use the InterSwitch Link (ISL) which is Cisco proprietary or the open standard 802.1q. So to put it a bit more simply a trunk permits different vlans which are tagged to traverse over the link.

A good article describing this is

<a href=”http://archive.networknewz.com/networknewz-10-20030725IntroductiontoVLANs.html”>

If you are dealing with Cisco switches understanding knowledge of VTP is also necessary

<a href=”http://www.cisco.com/en/US/tech/tk389/tk689/technologies_tech_note09186a0080094c52.shtml”>

To create a VLAN enter global configuration mode

config t
vlan 10
name Sales
exit

Creates vlan 10 with the name Sales

To assign a port to this VLAN you would create an access port

e.g.

config t
int fa0/1
switchport access vlan 10
switchport mode access
exit

to assign a range of ports (0 to 5) to vlan 10
int range fa 0/1 – 5
switchport access vlan 10
switchport mode access
exit

To create a trunk link between two switches requires you set up a trunk port

on the interface

switchport mode trunk

You will need a layer 3 device such as a router or L3 switch (3750) to perform intervlan communications.

The propagation of VLANS from a master switch (VTP server) to client switches requires setting up a VTP domain if you do not want to create VLANS on each individual switch.

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