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Community Member

vlan education campus

Hey all,

I have a couple of general vlan questions that I was hoping to get some help on. Currently I have 2 vlans on a campus with six buildings. I also use VACL's on the academic vlan(3) to prevent/allow to certain servers on certain ports on vlan1.

I want to keeps all servers, printers, wireless ap's, switches, etc on vlan 1 and then create 4 vlans for each building (which are only two stories tall). An academic and administrative vlan for the first floor and an academic and administrative vlan for the second floor.

I also want to use vlan pruning to cut out unwanted traffic. All of our servers and such are in one building so most of the vlans will not need to communicate with each other, just vlan 1.

Is this too many vlans? I was hoping to make the broadcast domains smaller. I should be able to use a class c subnet for each vlan, we are a small outfit.

Is there a better way of doing it?

Any advice and info would be greatly appreciated.




Re: vlan education campus


You are absolutely good to go with that. Segregating the vlans will give you different broadcast domian and hence lesss broadcast accross an indicidual segment and also layer 2 security acrross the whole network. The Ip addressing depends on how your present network is and how you really want to design. Class C subnet should be OK here.

Please shoot any questions if you have.

HTH, Please rate if it does.

-amit singh

Community Member

Re: vlan education campus

Thanks for the reply, This now brings up another question. Right now, I have a 4006 as my core L3 switch and it is doing all of the routing. In two of my buildings, they have 4506's doing most of the L2 switching. Can I remove some of the burden of the L3 routing from the 4006 to the 4506 in each of the buildings for the vlans that are in those buildings?

Lets say I setup vlan 2-26 as my vlans that I want to use. In building A with a 4506, vlans 22-26 are being used. Can I make the 4506 perform the layer 3 routing instead of it going all the way back to the 4006?

If so, how do I accomplish that?



Re: vlan education campus

Hi Matt,

Yes you can definetely do that depending which sup engine you have on 4506. If it is having sup2+ and above liek sup 3,4 you can do intervlan routing on the sup engine itself.

Incase you have sup 2 which is a pure layer 2 switch but have a module which is 4232 l3 module which you can insert in 4500 chassis you an configure routing there.

HTH, if yes please rate the post.


Community Member

Re: vlan education campus

Thanks for the reply. I think it is but it has been about 2 years since I got the first 4506. I think it has a sup3 and the other building has a newer 4506 that has a sup4.

How do I figure that out. Below is a sh ver from the older 4506 and it states L3 switching software but not what version the supervisor is.

show ver

Cisco Internetwork Operating System Software

IOS (tm) Catalyst 4000 L3 Switch Software (cat4000-I9S-M), Version 12.1(20)EW2,


Technical Support:

Copyright (c) 1986-2004 by cisco Systems, Inc.

Compiled Sat 17-Apr-04 15:41 by hqluong

Image text-base: 0x00000000, data-base: 0x00F573B4

ROM: 12.1(20r)EW1

Dagobah Revision 86, Swamp Revision 28

uptime is 32 weeks, 3 days, 12 hours, 31 minutes

System returned to ROM by reload

System image file is "bootflash:"

cisco WS-C4506 (XPC8245) processor (revision 7) with 524288K bytes of memory.

Processor board ID FOX081501B1

Last reset from Reload

2 Ethernet/IEEE 802.3 interface(s)

1 FastEthernet/IEEE 802.3 interface(s)

122 Gigabit Ethernet/IEEE 802.3 interface(s)

403K bytes of non-volatile configuration memory.

Configuration register is 0x2101

Thanks for any input


Re: vlan education campus

'show module' should give you the Supervisor part #.



Community Member

Re: vlan education campus

Thanks for the response

it shows ws-x4515 which I think is a sup 4 from a quick google search.



Re: vlan education campus


Its Sup-4 and it has full layer 3 capability. You can do and use all the L2/L3 features you want.

HTH, Please rate if it does.

-amit singh

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