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trunking for vlans

Posted on 2006-07-01
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Last Modified: 2010-03-19
Quick easy question.... i have two vlans on a switch that i want to be able to talk to eachother. From what I understand, I need to make a trunk port on that switch and send it to a router in order to get the vlans to talk to each other. What I would then do is config the ip helper address to my dhcp server so it will hand out the proper ip addresses.

The question is, Does the port on the router have to be a trunk port as well??
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Question by:khyer123
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atifawan earned 250 total points
ID: 17024187
A trunk is negotiated (or hard coded) between two devices supporting a common trunking mechanism (802.1q or ISL). Both sides need to be configured for trunking and to answer your question, yes the router port has to be configured as a trunk. For routers the method is to configure subinterfaces per VLAN. For a sample configuration please refer to the following link:

http://www.cisco.com/en/US/tech/tk389/tk390/technologies_configuration_example09186a00800949fd.shtml
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by:khyer123
ID: 17024246
aahh alright so that was my problem. i forgot to enable trunk port on my router! that's why my dhcp never got the ip address request broadcast. thanks for your help!!
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by:atifawan
ID: 17024302
You are welcome.
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