vlan

Unanswered Question
Aug 8th, 2007
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hello all,


What is the fram tagging & vlan tagging? what is the use and benefits to tag vlans and how we can tag vlans, what are the commands we need to execute.


plz. anybody can expalin,


Thanks in advance.

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ilnaiduccna Fri, 08/10/2007 - 07:57
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hello there,



Any body can solve my doubt plz. it would be appreciate.


Regards,

Naidu.

Jagdeep Gambhir Fri, 08/10/2007 - 08:38
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Naidu,


VLAN Tagging


When you want traffic from multiple VLANs to be able to traverse a link that interconnects two switches, you need to configure a VLAN tagging method on the ports that supply the link. Although there are a number of tagging methods in use for different technologies, the two are known as InterSwitch Link (ISL) and 802.1q. ISL is a Cisco proprietary VLAN tagging methods, while 802.1q is a open standard. When interconnecting two Cisco switches, ISL is usually the best choice, but if you need to interconnect switches of different types (a Cisco switch and an Avaya switch, for example), then you'll need to use IETF.



This example shows how to configure a port for trunk mode:


Switch(config-if)# switchport mode trunk



This example shows how to configure a port for as an 802.1Q tunnel port TAG:


Switch(config-if)# switchport mode dot1q-tunnel


Hope that helps



Regards,

~JG




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