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Adavantages and disadvantages of using multiple SSIDs

Valued Contributor
In a old thread (that I only noticed recently) it was mentioned that each SSID uses 2.3% of bandwidth. Not seen that figure mentioned before.
I use a lot of SSIDs (12) to segregate, assign and control different groups of school laptops. If this is correct I would try to use far fewer.

Any comments about the BW implications per SSID or other reasons for/against numerous SSIDs welcome. Thanks.

Valued Contributor
Lowest 11b is 1Mbps. Lowest OFDM defined for 11g is 6Mbps. You can increase that, usually to 12 or 24 since those are the basic rates 11g must support.
But you need to be careful. Raising rates doesn't actually decrease cell size since the preamble is always sent at minimum rate (6Mbps) regardless of the rate you set.

The least you could do is disable 11b. Do it now and thank me later! Then try raising minimum rate and see how far you can go with that. If you start running into problems throttle down.

I haven't tested with the new FW (9.7), but I think there is a small bug in it where if you set a rate of 12 or other and want to change back to 6 you won't be able to do it. It will notify you that 6 isn't supported, but you can set it to 5,5Mbps which is one of 11b rates which is just ridiculous.

Contributor III
So... configuring ofdm-only would give you one sixth of the airtime overhead per SSID?
That would give you about 4% overhead for 12 SSIDs.
Is that right?

New Contributor II
please..someone to tell me...

i have 1AP with 6 SSID.. it means 6 RF signal ??
therefore, it means AP causes his own interference ??
its similar to have 6 antenas on same place radiating with same channel and power.???
devices( as a laptop) receive 6 signals and therefore interference wich comes from one antena????


Esteemed Contributor II
Depending on your authentication methods, you could serve 12 sets of clients with one SSID, and pass a VLAN attribute back from your AAA server to say which of 12 different VLANs to put the user into, with a dynamic VLAN feature.