The manual for 2.9 states that you can have 4095 VLANs per interface. However, when trying to test that, I have found that I can only get 275 VLANs on the router at all before it won’t let me have anymore. If I have 276 or more, after a reboot, the interfaces do not come up right. I have tried all 276 on one interface and also separating them into multiple interfaces with the same result. As soon as I hit 276, the interfaces stop working correctly, and as soon as I take it back down to 275, they work again. Is there any known reason why this is happening? I have tried the same tests on a pc with a 1.0 GHz P3 with 512 of RAM, and on a Mikrotik rb532. Both are currently running 2.9.13 and I also tried downgrading them every step of the way down to 2.9.8 while testing the theory at each step. Your help is greatly appreciated.
make a supout.rif file at the moment when you see that no more can be made. we will also test it here. send the file to support@mikrotik.com
Thank you, I greatly appreciate it. I have sent the .rif file and am eagerly awaiting the results of what you find 
. We are attempting to implement a very large vlan network and can’t wait to get this done 
.
Hi,
could you tell me the performance on a very large Vlan net?
Ciao
Massimo
We have not found any negative side effects of running everyone on their own VLAN, but it has DRASTICALLY cleaned up our network. We no longer experience any broadcast storms whatsoever, and if anything, we have seen a network wide improvement in performance due to the fact that there isn’t any broadcast traffic that effects anybody. We used to have up to 10 Mbps worth of just broadcast traffic alone.
Thank you,
are you implementing on a wireless lan or Lan?
Becouse I found that on wireless lan there is the possibility to enable the default forward on the wlan interface to isolate single client and I have not found the same features on a Lan interface. Vlan isolation seems the only solution for lan interface.
Massimo
We are doing it on the LAN. We have a very large Motorola Canopy network and aren’t really running any Wi-Fi for our customer network. The VLANs implement perfect with the Motorola design.
Canopy is wireless too, not in WIFI but it is used in FWA.
I’m using FWA too but it is small (about 100 customers) in Italy.
I’m redesing the network with the new Atheros Chipset to create mesh solution, with better customer isolation and security. I’m documenting while waiting for the routerboard equipment will arrive. I plan to use VLAN to manage different areas and different repeaters, not for a single customer only, 
obly if the default forward feature works fine 
.
It is interesting to exchange some info with a big network manger as you.
You can contact me direct to public[at]maxfava.com
Ciao
What is the last info concerning this point?? Are more than 276 VLANs possible?
Has any one tried several hotspot, each one on a VLAN interface?
Regards,
seandsl
I can’t even get 248 vlans to work (which is what we have to have). We are running 2.9.14 - routerboard44 4 port card and pure intel motherboard. After reboot, none of the interfaces respond. If I disable and re-enable individual interfaces manually (including vlans) they start working. Also, in winbox the interaces aren’t counting any packets or throughput - once I bounce the interfaces they start counting.
I thought about writing a script to disable and re-enable all interfaces on reboot, but that’s just a dirty hack and makes me suspicious of the routerOS in general. I have tried different hardware, always with the same results. Anybody have a better fix or reason for why this doesn’t work? This is a major deal-killer for us using MT.
You need to upgrade the firmware on your router. I believe it was 2.9.17 or somewhere around there that Mikrotik fixed the bug you are talking about.
Thanks for the help! That seems to have fixed it…