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network design question

post #1 of 8
Thread Starter 
okay well ive been selected to design a network for washington as a school project. its going to be 3 school and a central office. all packets will travel thru the central office going from and to each school. im kind of done with the design part and looking for devices to place inside the school. i will have my core switches inside the central office seeing that all the processes will go thru there. most likely have fiber connecting them. then ill have my distribution switches in my MDFs with the access layer in my IDFs all connected via fiber i believe, ill have cat6 running from IDFs to PCs.

i quess my questions are the following:
1. im confused on where to place my routers, do i place them in front of my core switches so that everyone knows where packets are at? i would think that would be ideal, but then again would i place some more in front my of distribution? idk im just lost.

thats my only question for now i believe, if anyone has any experience with this please inform me if im doing anything wrong, dont have a budget since its a project..

i will be setting up VLANs also. i believe i have that down though..
post #2 of 8
When you say Central Office (CO) are you meaning a central point for all 3 schools or is it a LEC (Local Exchange Carrier) CO? If the CO is LEC owned each site would need a router as a termination point for the WAN circuits to each site. I have seen instances where they use a fairly powerful modular switch to act as both the Border Router and the Core Switch Cisco 6509 for example with routing modules to handle the WAN traffic. You'd probably need VPN Tunnels between the 3 sites if it's traversing telco circuits. Even though this is a project you want to still take all factors into account and make sure you don't over build the network as things like power usage can be a factor and something to consider when factoring costs real world. Balancing needs and room for expansion vs cost isn't always easy but something I think it would be a good practice to get into sooner than later. That's just my 2cents.gif
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post #3 of 8
Thread Starter 
Ithe central office is just where the WAN from the isp goes then it goes to the three schools, all schools will be connected to the CO, I don't think it's LEC Because I've never heard that term : s

I was thinking that it would be best to have either a nice high end switch or router at each location to direct packets in the right direction or to the correct switch..

Each school will have a different ip address..

I was thinking 2 core switches per location for redundancy then have a couple distribution then of course access layer in idfs via fiber then cat6 to pcs
post #4 of 8
It really does depend. My work literally does something similar. We lease dark fibre between our primary and 2ndary campus, and all traffic from the 2ndary is distributed from a 4506, which has direct links to our 6509 core switch. We have a Vlan specified for that campus. So if it's that kind of setup, a switch that can handle layer 3 is all you will need. Setup a small subnet( probably like a /29) for the IP addresses for each building (each school and central office). Then create a vlan to host them, and on each switch create another vlan for the local traffic with a private subnet 192.168.XXX.XXX. The switch should route the traffic between all school, you just may need to make sure you have some routes in the big core switch at the central office to route the traffic between the schools.
post #5 of 8
Quote:
Originally Posted by carterboy View Post

Ithe central office is just where the WAN from the isp goes then it goes to the three schools, all schools will be connected to the CO, I don't think it's LEC Because I've never heard that term : s
I was thinking that it would be best to have either a nice high end switch or router at each location to direct packets in the right direction or to the correct switch..
Each school will have a different ip address..
I was thinking 2 core switches per location for redundancy then have a couple distribution then of course access layer in idfs via fiber then cat6 to pcs

You have to have the requirements and build to those requirements! Anything that is posted or suggested is just a stab in the dark without know what the requirements are.
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post #6 of 8
Thread Starter 
well the schools consist of 2500 students, its 500 nodes per school, prob use 250 for students and 250 for teachers/ admin. ill prolly grab a /22 for each school, seeing that i need atleast 500 ip addresses, and i wouldnt wanna pull 512 so ill grab 1024.. im not sure how im setting up VLANs yet.

teach me how to set up VLANs lol.. well not the commands but how they work i guess. i know all the commands, we are learning switching and wireless this semster.

so your 4506 is what? a router or switch, and its located in the secondary location and its connected to your core switch? i do understand that you can have vlans in different subnets as long as they are like stated above, 192.168.X.X, because i plan on having multiple vlans for different departments.

also each location needs to have 2 LANS per location.

i have my schools drawn out and where all my MDFs and IDFs will be located. i guess what i need to do next is figure out what kind of routers and switches i need, and then start the ip process.

i think ill have 25 rooms for admins, which will consist of a computer/printer for each and ill prolly add a server or two, very new to servers and their functions. then ill have 100 classrooms with atleast 2 computers and a printer, then a computer lab or two which will have 30 computers and a printer.
Edited by carterboy - 10/22/12 at 2:04pm
post #7 of 8
k that is a start but still not enough... so 500 end points, how many servers per site? How large are the schools, meaning distances. If all the endpoints are centrally located you could utilize 2 4507's running HSRP. If on the other hand all the endpoints are spread out utilizing 3750's in stacks may be a better option. If there are no servers at each satellite then you need to build in redundancy and ensure WAN links are large enough to handle all LAN traffic. Your first post stated all packets will be sent back to the Main campus which is why I ask. What types of traffic will be traversing the network i.e. raw data, video, voice, VDI? What are the security requirements? Will each site have it's own connection to the internet or will the POP be at the Main campus?

VLAN's the primary purpose was to break larger broadcast domains into smaller manageable ones and ties heavily to subnetting. Security can then be applied to limit access from one VLAN to another.

If this is just a school project that a teacher assigned they should be providing you with all the requirements so you can build a scalable network. It could be that if the teacher is leaving this information out they are expecting you to either know to ask these types of questions or to teach you about requirements gathering. If on the other hand they are just wanting a down and dirty build 1 main campus and 3 satellites screw anything else as far as traffic loads and such... well
main site 3945 router with an OC3, each satellite with DS3 on a 3945, run them all through MPLS, each satellite run 2 4507's in HSRP forget about firewalls and ACL's, 1 VLAN assigned for teachers a /24 another VLAN assign for students a separate /24. Default gateway on the 4507's pointing to that sites 3945 and there is your network...now if you are needing this to be an actual real life deployment you have to have all of the requirements and it will take weeks-months to design this out the way it should be.
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post #8 of 8
Thread Starter 
i talked to one of my coworkers in IT today and he said they have one layer 3 switch/router in the whole tech college, so would it be ideal to pretty much have that set up within all the schools?

i still dont really understand vlans, im going to go home and read the chapter on them tonight, so say i have 4 vlans per school, would that be ideal? with all vlans being a /24 say 192.168.X.X another vlan at another school being 10.10.X.X and last school vlans being 50.10.X.X ?

sorry im asking these prolly terrible questions, i just have a terrible team im grouped with and im the only one that knows a little about the stuff..
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