[cisco-voip] 7925s across campus

[Mike King]

I set my phones up as users on our 802.1x Enterprise WLAN, I'm not
sure how scaleable this is (I only have 6 phones) but I could return a
different subnet via radius attributes if I wanted to.

On Wed, Oct 13, 2010 at 3:30 PM, Scott Voll <svoll.voip at gmail.com> wrote:
> But what would keep you from having 4 or 5 different SSID and set 1/4 or 1/5
> of them to a different SSID / Subnet?
> Yes it burns 4 or 5 WLANs but then the subnet size would be smaller.
> But as Mike also pointed out.... there are features to take care of it as a
> large WLAN.
> Scott
>
> On Wed, Oct 13, 2010 at 11:12 AM, Lelio Fulgenzi <lelio at uoguelph.ca> wrote:
>>
>> 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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