topic Re: Vlan pooling in ZoneDirector

Vlan pooling

otman_ibrak — Fri, 11 Jun 2021 12:08:00 GMT

Hello,

I have just joined a team and I am responsible for zonedirector administration. I found that Vlan pooling are not set up on zonedirector but clients can still get an ip Address from dhcp per scope per wlan. ex : if I pickup a wlan from those offered by the Aps I get an IP from the same scope no matter the device i am using or when I pick up this wlan. do you have any explanation to this please ?

With kind regards

Re: Vlan pooling

syamantakomer — Mon, 14 Jun 2021 21:52:46 GMT

Hi Otman,

Could you provide more information on what you are exactly looking for?

You can use dynamic VLAN with ZD but your network infrastructure should support it.

For the WLAN static VLAN config, whatever you will tag on under the WLAN advanced setting, client will get the IP on same VLAN, no matter what device is joining the WLAN.

Re: Vlan pooling

otman_ibrak — Thu, 17 Jun 2021 13:28:10 GMT

Hello Omer,

scenario : user picks up a SSID to connect and he/she gets an ip address from the same scope on dhcp server, Windows, always from the same scope whenever the same ssid is chosen. what I can't understand how the dhcp request is broadcasted to the same Vlan . How the AP knows that a given SSID is mapped to a vlan while Wlan are configured as you can see on the screenshot ? Thank you.

Re: Vlan pooling

syamantakomer — Thu, 17 Jun 2021 15:08:49 GMT

Hi Otman,

As per the screenshot I see Dynamic VLAN and VLAN Pooling both are disabled.

In above condition, user will get IP address depending upon Native/Untagged VLAN configured on switch port (and WLAN), where AP is connected.

For example, X SSID is configured with VLAN 1(default VLAN/Untagged) under WLAN advanced settings. Switch port for AP1 is configured with VLAN 2 as untagged/native and for AP2 switch port VLAN 3 is configured as untagged/native VLAN.

In above scenario, if a user connects to X SSID on AP1, it will get IP address from VLAN 2 and if user connects to AP2 on X SSID then it will get IP from VLAN 3.

If VLAN is tagged on WLAN settings (anything other than 1 configured under WLAN advanced setting >> VLAN) then only AP will send the DHCP requests to configured VLAN/Network gateway.

Re: Vlan pooling

otman_ibrak — Fri, 18 Jun 2021 12:24:50 GMT

Hello Omer,

Thank you for your response. More info for you please.

All the APs are part of the VLAN48, so the PVID for every ports the APs are connected to is VLAN 48. the VLAN 1 is excluded on "participation" colonne. I still can't see how when a user tap on an SSID and his/her dhcp request is forwarded towards the same scope no matter the type of device and the same thing with all other SSID. Excuse my ignorance but how the AP knows that if the dhcp request is sent via x SSID, it must be broadcasted to the x vlan while the switch port will consider the untagged traffic as destined for vlan 48 ? Thank you.

Re: Vlan pooling

syamantakomer — Fri, 18 Jun 2021 13:16:13 GMT

Is the VLAN48 configured as tagged VLAN or its a native/untagged VLAN for the trunk port?

If VLAN 48 is native/Untagged, observed behavior is expected.

As per the basic switching VLAN concept, untagged traffic coming from connected device will be processed by the switchport, irrespective of configured untagged VLAN on the other side device.

Untagged ethernet frames from a device doesn't include the VLAN information in the ethernet frame, so what VLAN number is assigned doesn't matter.

In short, untagged VLAN can talk to any untagged VLAN on the other side of the device.

In case of Ruckus WLAN configuration, VLAN 1 is considered as untagged and as soon as you change it to any other VLAN, it will become a tagged VLAN.

Re: Vlan pooling

otman_ibrak — Mon, 19 Jul 2021 13:59:47 GMT

Hello Omer,

As you can see, this switch is connected to AP via interface5 and the untagged traffic is for vlan48, which groups all APs. Vlan1 is untagged too but excluded and I think that is normal as a port can't handle untagged traffic for more than a vlan.

As questionned before, the AP is broadcasting 4 SSID, how the AP forwards the dhcp request to a specific pool while WLAN pooling is not enabled on the controller ? I am not sure if I am clear but when a user picks up an ssid the AP forwards the dhcp request to the same gateway.

Re: Vlan pooling

syamantakomer — Mon, 19 Jul 2021 20:44:51 GMT

Hi Otman,

So in the above configuration, your switch port 5 is configured with Untagged VLAN48. Right?

Now come to client DHCP. Depending upon what VLAN is configured on the WLAN, on which your client is connecting, AP will send the DHCP frames.

Lets say, if WLAN/SSID is configured with VLAN20 (and same is tagged on the switchport), then AP will send a tagged DHCP frame out from its ethernet interface and then that frame will hit the gateway of VLAN20 (assuming there is no other L3 device which is acting as relay agent).