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New Member

Single subnet and WLC in an NM :- ip overlap problems

Consider the scanario :-

I have a very simple network with only two subnet :- 10.1.1.0/24 (data) and 10.1.2.0/24 (voice) with a 2811 router-on-a-stick to route between them.

Now I have a WLC that I insert in an NM module on another 2811 which has Fa 0/1 on the 10.1.1.0/24 (data) network.

The config on my 2811 with NM looks like :-

interface FastEthernet0/1

ip address 10.1.1.5 255.255.255.0

interface wlan-controller1/0

ip address 10.1.11.1 255.255.255.0

!

interface wlan-controller1/0.8

encapsulation dot1Q 8

ip address 10.1.8.10 255.255.255.0

I cant assign the wlan-controller interface on the NM in the 10.1.1.0/24 network because it clashes with Fa0/1.

So I have ended up creating another network 10.1.11.0/24 just for the management and ap-manager static interfaces.

For the wireless clients too it looks like I have to create a wlan-controler sub-interface and create a separate vlan.

Now I will have my wireless clients in 10.1.8.0/24

The sub-interface on my second 2811 should allow routing between my wireless 10.1.8.0/24 network and the wired network.

My Question is :-

Is creating a separate VLAN just for wireless clients the only way with the WLC ?

Is there no way, I can have my wireless clients on my data vlan ?

There seems to be no option of using the address of Fa 0/1 for the wlan-controler with ip unnummbered.

Thanks

3 REPLIES
New Member

Re: Single subnet and WLC in an NM :- ip overlap problems

Here is a quick link for this...

http://www.cisco.com/en/US/tech/tk722/tk809/technologies_tech_note09186a00807112e2.shtml#ex3

I have taken the liberty of changing the configuration you provided given you state earlier you are doing router on a stick. Now for your network you should see a configuration like:

Interface GigabitEthernet1/0.10

Encapsulation dot1Q 10

Bridge-group 11

!

Interface GigabitEthernet1/0.11

Encapsulation dot1Q 11

Bridge-group 11

!

interface wlan-controller1/0

ip address 10.100.0.1 255.255.255.0

!

interface wlan-controller1/0.10

encapsulation Dot1q 10

bridge-group 10

!

interface wlan-controller 1/0.11

encapsulation Dot1q 11

bridge-group 11

!

Bridge irb

Bridge 10 route ip

Bridge 10 protocol ieee

Bridge 11 route ip

Bridge 11 protocol ieee

Interface bvi 10

description DATA VLAN

ip address 10.1.1.5 255.255.255.0

!

Interface bvi 10

description VOICE VLAN

Ip address 10.1.2.0 255.255.255.0

Let me know if this makes sense...

/Dave

New Member

Re: Single subnet and WLC in an NM :- ip overlap problems

Thanks Dave,

Thats similar to how I am doing it at the moment, except that I have another router doing the inter-vlan routing, so I dont really need the BVI.

Its just that on the 4400 and 2100 models, the "ports" are more like switchports, so you can attach the management interface to a switch, over a trunk.

On the NM however, its like connecting to a router sub-interface, instead of a trunk....

So there is no real way around it...

Thanks

New Member

Re: Single subnet and WLC in an NM :- ip overlap problems

Yes, this is more of how the ISR hardware works, so using the BVI to trunk to your VLAN's then set the bridge group on the VLAN without an IP should work (just thinking without putting it on mine)

interface VLAN 10

bridge-group 10

I have to hunt around for another module as I lent it to a peer to really test this.

/Dave

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