Question about Wireless Design and Controller

Hi Everyone,
Although I am not new to Cisco, I have somewhat limited experience with Wireless in general. I was hoping to get your help with the following:
We currently have a total of 8 1130AG, 4 on each floor. They were configured a few years ago, and now we are looking to update the design a bit. Each AP has its own SSID, and just provide internet access. Looking at the configuration, I noticed that they are not configured to use proper channels, just random channels (9, 10, 11, instead of 1, 6, 11, etc.). I noticed that when I roam between one AP to another, I lose about 4-8 pings before I re-establish connectivity again.
Here are my questions:
1. Do I need a controller in order to use just one SSID for the whole setup instead of the 8 seprate ones we currently have?
2. Will the controller helps in providing seamless transition when a client roams between AP's?
3. Is it normal to loose connectivity roaming around?
4. Can I reconfigure the current setup to use just one SSID and provide better transition between AP without the use of a controller?
5. Which controller would you recommend?
We don't have a need to anything fancy ,I am aware that I can enable multiple SSID, VLAN's, etc. Just trying to keep it as simple as possible, yet reliable.
Your input is appreciate.
Thanks

1. With 8 AP's only, a WLC would be nice-to-have but not necessary. You can configure WLSE and it will do some limited functions.
2. This depends on the signal strengths, wireless coverage and configuration. If you enable WLSE, for instance, and you have no wireless black spots, then roaming should be no issues.
3. See #2.
4. You can configure multiple SSID (up to 16 are broadcasted) but if one AP doesn't have the SSID you use for roaming, the association will drop when the client tries to join that particular AP. It's like mobile phone towers. If your carrier is not in the area, you sure won't be able to use your mobile phone in that area.
5. For 8 1130 APs, I'd recommend the smallest of the lot: 2106 with either 6, 12 or 25 AP licenses. I'd recommend you the 25 AP licenses. If your finances allow you something bigger, then consider either the 4402 (25 AP licenses) or the 5508.
Cisco 2100 Series Wireless LAN Controllers
http://www.cisco.com/en/US/prod/collateral/wireless/ps6302/ps8322/ps7206/ps7221/product_data_sheet0900aecd805aaab9.html
Cisco 4400 Series Wireless LAN Controllers
http://www.cisco.com/en/US/prod/collateral/wireless/ps6302/ps8322/ps6307/product_data_sheet0900aecd802570b0_ps6366_Products_Data_Sheet.html
Cisco 5500 Series Wireless Controllers Data Sheet
http://www.cisco.com/en/US/prod/collateral/wireless/ps6302/ps8322/ps10315/data_sheet_c78-521631.html

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Message was edited by: Maggie

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Hi,
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That help?

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>
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>
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>
Can i use any different algoritm to search, different indexes(function based) for example (on step 2)?
>
No.
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http://docs.oracle.com/cd/E17277_02/html/index.html
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Hi,
I am planning for a wireless design for a new site and would like to understand the following
1. Should I go with the Access Point (AP) that support 2.4 GHz or 5 GHz or both
2. What is the average coverage area in meters or feet for both the frequencies
3. If the overall area is 2000 Sq. feet with few walls in between, how many access points will be required approximately
4. What is the leading practice on the number of users per AP
5. What are the circumstances when a Wireless controller need to be deployed. Is it purely based upon the number of AP's to manage?
6. Should there be a separate DHCP scope for each AP? If not, how to AP's communicate with each other if there is no controller deployed?
Your time for answering these will be highly appreciated. Thank you.

Hi Manoj,
Here is my responses to your qurey.
1. Should I go with the Access Point (AP) that support 2.4 GHz or 5 GHz or both
BOTH
2. What is the average coverage area in meters or feet for both the frequencies
These days coverage is not the primary criteria, its capacity. Roughly you need to put a AP for each 20-25 devices for normal data usage.
3. If the overall area is 2000 Sq. feet with few walls in between, how many access points will be required approximately
Based on the number of devices expected in each area you can determine that. If you do a survey do it in 5GHz which is lower cell size.
4. What is the leading practice on the number of users per AP
If it is typical data usage (email, browsing,etc) then 20-25 users per AP. If you require Video/voice then this number comes down to around 10.
5. What are the circumstances when a Wireless controller need to be deployed. Is it purely based upon the number of AP's to manage?
Always go for a Controller managed solutions. It is very hard to control RF environment if you go to manage then individually.(like autonomous AP)
6. Should there be a separate DHCP scope for each AP? If not, how to AP's communicate with each other if there is no controller deployed?
No, you can have single DHCP scope for AP. As long as AP & WLC have layer 3 reachability it will comunicate with each other using CAPWAP protocol.
HTH
Rasika
**** Pls rate all useful responses ****

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