Subnet & Network Design

[mccullrr]

I posted this on the Cisco Router page with no response so I thought I would post here also...

A little backgound info...

I have inherited a 4 year old network design. We have 6 dorms with either 1 or 2 Cisco 4507's (total of 10) that network back to a core 4507. The subnets are as follows...

wired -
Dorm1_A = 10.31.0.0/23
Dorm1_B = 10.32.0.0/23
Dorm2 = 10.33.0.0/23
Dorm3_A = 10.34.0.0/23
Dorm3_B = 10.35.0.0/23
Dorm4_A = 10.41.0.0/23
Dorm4_B = 10.42.0.0/23
Dorm5_A = 10.43.0.0/23
Dorm5_B = 10.44.0.0/23
Dorm5 = 10.45.0.0/23

Wired Mgmt
10.1.1.0/30
10.1.1.4/30
10.1.1.8/30
10.1.1.12/30
10.1.1.16/30
10.1.1.24/30
10.1.1.28/30
10.1.1.32/30
10.1.1.36/30
10.1.1.20/30

Dorm Wireless
10.31.2.0/23
10.33.2.0/23
10.34.2.0/23
10.41.2.0/23
10.42.2.0/23
10.44.2.0/23
10.45.2.0/23

Wireless Mgmt
10.1.31.0/23
10.1.33.0/23
10.1.34.0/23
10.1.41.0/23
10.1.42.0/23
10.1.44.0/23
10.1.45.0/23

So basically giving me roughly 510 hosts per subnet. My task now is that we are adding one more dorm to the network. I'm trying to plan for future growth and am wondering if 510 hosts will be enough. If I choose to use another subnet scheme different than /23, will it work?? Can it be done?? How would you set up your new dorm?

Thanks to everyone for their assistance. Hope I didn't confuse anyone.

Becky

 

[chipk]

Becky, as far as how many hosts will be enough, only you can make that determination. And that's the question that needs to be answered before you add networks.

For the dorm, you'd have to determine how many rooms, and then go with how many rooms will be occupied, how many students will all be on at the same time, how many ports per room, etc.

 

[CallmeDaMaN]

What protocol are you using? Because, yes you can change the subnet and allow for more hosts.

 

[mccullrr]

I'm sorry - I'm fairly new to networking. Do you mean encapsulation ARPA or Internet Protocol routing is enabled?

Becky

 

[rmcp2k]

i think he mean your routing protocol; rip, eigrp, ospf, bgp ....

 

[mccullrr]

When I do a sh ip route, all are either connected or static. I don't see any reference to rip, eighrp, ospf, etc....

 

[chipk]

Becky's main question was how many available addresses she needs on the network. That's something she's got to figure out based on the number of hosts that will be in that building. I don't think extending a subnet is her problem. She's looking at initial configuration of a new subnet.

 

[mccullrr]

Thanks so much to all your responses. I probably will have enough with the /23 subnet. The dorm will basically be all wireless. There will not be any hard wired drops in the students rooms due to lack of money. We will have approximately 28 rooms per floor , 2 students per room, with 5 floors total.

My original thoughts or question I guess was if I went with a /22 subnet instead of the /23 would that cause a problem. I'm just wondering because of vlsm and subnetting and wasn't sure as to whether it would work for my network.

 

[chipk]

Static routes support VLSM, so you *could* do the /22. That would be 1022 hosts, though, which would be a little crowded. What are you using for your Wireless APs?

 

[mccullrr]

It will probably be either a Cisco Aironet 1231G or a Cisco Aironet 1100. We currently use the 1231G's in all other dorms, but I was looking to see the difference between the 1100 series. We will have 4 waps per floor.

Becky

 

[chipk]

Oh, ok. i was just curious about how you were spreading out the wireless APs.