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Cisco 2821/Dell 6248 Vlan question

Posted on 2010-11-29
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Last Modified: 2012-05-10
alright, i have 2 new 6248 connected by fiber in the same building into an existing network which uses a 2821 to handle routing for the multiple campus vlans, so there are currently several sub interfaces on the router already.  I want to create a new vlan to be used with some of the ports on the new 6248's.  To do that, i would create the new vlans on the switches , assign whatever ports i want to that vlan, create a sub interface on the lan facing interface of the router, set dot1q encapsulation and the vlan number and set the ip to be the .1 of the subnet i want to use?  Just thinking outloud and getting confirmation.  also I would need to specify on the sub interface the ip helper for the campus dhcp server, correct?
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Question by:jasonmichel
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flakier earned 2000 total points
ID: 34233099
That sounds about right to me.  Kudos for using the sub-interfaces; they are the right tool for the job.  I don't know if you already do, but try to name the sub-interface number (the part after the dot) to match the VLAN number to ease troubleshooting.

Also don't forget to set the default router in the DHCP scope for the new vlan to be that new sub-interface IP address
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by:jasonmichel
ID: 34233188
yep, thats usually what i try to do, too many vlans to try to remember all the subnets/vlans etc..lol.  yep, i already have the dhcp scope set up..so i think that should be set.  Ill probably have to add the new subnet to the acl of the management vlan and the vlan with the dhcp server as well.
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