[cisco-voip] 7925s across campus

[Lelio Fulgenzi]

We do something similar on our wireless network, granted, without voice so far. 

One of the biggest advantages of having all hosts on the same subnet is roaming. Roaming across subnets begins to introduce some difficulty and complexity. 



--- 
Lelio Fulgenzi, B.A. 
Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1 
(519) 824-4120 x56354 (519) 767-1060 FAX (JNHN) 
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 
Cooking with unix is easy. You just sed it and forget it. 
- LFJ (with apologies to Mr. Popeil) 



From: "Mike King" <me at mpking.com> 
To: "cisco-voip (cisco-voip at puck.nether.net)" <cisco-voip at puck.nether.net> 
Sent: Wednesday, October 13, 2010 2:06:47 PM 
Subject: Re: [cisco-voip] 7925s across campus 

Hey Jason. 

The VLAN would be terminated on the Wireless LAN controller, so 
technically the VLAN would not be across multiple buildings. (The AP's 
take care of getting the traffic back to the WLAN controller) 

The WLAN controller also does broadcast filtering, which would 
alleviate the issue with having all those clients in a /16. 

I can take a stab at the reasons they want them in the same Subnet. 
A. They don't want to make more than 1 subnet for ease of ACL 
B. They most likely want to use the PTT (Push to talk) button as a 
walkie talkie/Nextel type service. The PTT requires multicast. They 
might be mistakenly thinking that by being in the same subnet, they 
won't have to enable multicast on the wireless LAN. 


To throw some general advise, remember to disable ALL client load 
balancing features on the WLAN controllers, as they will degrade 
performance horribly. Also remember to turn Peer to Peer Blocking off, 
as it will prevent phone calls to each other. 

I'm in contact with several large colleges, and they routinely run /16 
on they're wireless LAN. They haven't run into any specific issues 
with Subnets being that large. Personally, I think it might be a 
little more sane to break it up into something smaller. 

Mike 


On Wed, Oct 13, 2010 at 1:04 PM, Jason Aarons (US) 
<jason.aarons at us.didata.com> wrote: 
> Customer is looking at about 800 7925s across a campus, they mentioned 
> having a single 7925 voice vlan (10.x.x.x/16) across all Wireless LAN 
> Controllers (4400s) for the whole campus for these 7925s. This doesn’t 
> sound good having all 7925s on same subnet across multiple buildings. 
> 
> 
> 
> What are others doing as the Enterprise Mobility Guide 4.1 doesn’t give much 
> thought. 
> 
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