[c-nsp] Access Point & 2 SSID's Trunked to Vlan's

[Fred Reimer]

For VoIP, if not dropped then possibly you will have bad audio during a
roam.  Non-LWAPP Cisco AP's can use WDS on a stand-alone AP or a WLSM (EoL),
but can also use IAPP on the wired side.  It sounds like you need to talk to
an integrator / partner.

 

Fred Reimer, CISSP, CCNP, CQS-VPN, CQS-ISS

Senior Network Engineer

Coleman Technologies, Inc.

954-298-1697

 

  _____  

From: Dan Letkeman [mailto:danletkeman at gmail.com] 
Sent: Tuesday, December 18, 2007 3:57 PM
To: Fred Reimer; cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] Access Point & 2 SSID's Trunked to Vlan's

 

Well I just did a test two AP's about 100 feet apart and the notebook roamed
from one AP to the other without losing a ping.  We are interested in
putting in a voip system and possibly having a few wireless phones.  Will
this configuration of an access point cause calls to be dropped? 

Dan.

On Dec 18, 2007 2:47 PM, Fred Reimer <freimer at ctiusa.com> wrote:

This is incorrect.  You don't get "fast" roaming, such as may be required
for some protocols like VoIP, but you will not get "disconnected" by the
common use of the term.  You are of course disassociated from one AP and you

need to reassociate to another AP.  However, it would depend on what kind of
authentication you are doing as to whether this would "disconnect" the
client.

The client makes the decision on when to roam, but an AP can of course 
forcefully disassociate a client.  You can configure the power settings for
each radio in an AP.

Fred Reimer, CISSP, CCNP, CQS-VPN, CQS-ISS
Senior Network Engineer
Coleman Technologies, Inc. 
954-298-1697



-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto: <mailto:cisco-nsp-bounces at puck.nether.net>
cisco-nsp-bounces at puck.nether.net] On Behalf Of

A.L.M.Buxey at lboro.ac.uk

Sent: Tuesday, December 18, 2007 9:17 AM
To: Dan Letkeman
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] Access Point & 2 SSID's Trunked to Vlan's

Hi,

> If I copy this configuration to my other ap's in the building will a
> client(notebook) automatically roam from ap to ap without getting
> disconnected?

not without using other technologies - as each AP runs the authentication 
so your client needs to reauthenticate when associating with each AP

> Do you have 802.11a clients or is the 802.11a radio used for something
else?
> How would I setup the AP so there is a minimum signal level that is 
> allowed?  eg, if a user is outside the building and still connected that
it
> won't work if the users device is say past -75db...

you can start off by using the 'speed' command to select the supported 
connection rates - but a decent antennae may negate the 'security' of
such a setup. personally i feel that WPA2 is strong enough that it doesnt
matter if the signal can be received from further away. you could also 
turn down the power of the antennae (antenna gain) - but, once again, that
will affect how your own users will receive the wireless.  place
a decent zinc/neodynium mesh or somesuch in your wall cavities - there
are some papers out there describing such blocking methods.

> Also, I accidentally ordered LWAPP's and I have converted them back to
> autonomous ap's.  Is there any difference between a converted one vs a 
> bought autonomous ap?

apart from how it appears in CDP, inventory lists and its bootloader?
no functional difference as far as i'm aware.

alan

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