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New Member

wireless ap & subnet

Hi,

One of our subsidary is doing a ip address revamp. Part of the device affected will be two controllers(management interface) which are now working.

The ap's connected to these currently are on same subnet (172.16.30.x/24)

Controller1: 172.16.30. 5 /24

Controller2: 172.16.30.6  /24

Two scenarios are being discussed:

1. IP address & subnet mask of both controllers will be changed

2. only subnet mask of both controller will change

Any of these also implies that the svi interface on the switch will also be changed to accomodate above.

I want to see how both of these scenarios will affect currently ap's that are working.

a) will the current AP's get disconnected during any of the above changes?

b) will any manual reconfiguration be required on the ap's?

c) how should the change be carried out, should the switch svi be changed, then controllers & finally the ap's ?

Appreciate all advise.

1 ACCEPTED SOLUTION

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VIP Purple

wireless ap & subnet

what mask new subnet would get ? Does gateway address will be remain same or change? I would do this in following order assuming only subnet mask going to change.

1. Change the DHCP scope for AP to reflect new subnet mask

2. Change the SVI IP address to reflect the new subnet mask

3. Change the WLC mgt interface using console access to WLC

(WLC) >config interface address management

4. Bounce the APs  & verify those get new IP/mask & register to one of your controller.

HTH

Rasika

**** Pls rate all useful responses ****

9 REPLIES
Hall of Fame Super Silver

Re: wireless ap & subnet

Well it will always still require a down time no matter what. It's almost easier to actually create a new vlan instead of changing the existing. Since they are on the same subnet, you would want to bounce the AP's to get the new dhcp lease. Might be easier and safer to create a new vlan and move WLC2 there. Move all the AP's to WLC1, then adjust the mobility group and then move the AP's to that WLC2. Then change the network and move the other WLC1 to that vlan and change the mobility group. Then move the AP's to that WLC1 and then change WLC2 to the new vlan and then change the mobility group and your done.

Sent from Cisco Technical Support iPhone App

-Scott
*** Please rate helpful posts ***
New Member

wireless ap & subnet

Thanks Scott.

Only the subnet(mask) is to be changed , IP will remain same. I just got heard this confirmed from the folks.

In this case, would the above still apply. How should we proceed to change the subnet on wlc, switch interfaces and how should the ap's be handled.

VIP Purple

wireless ap & subnet

what mask new subnet would get ? Does gateway address will be remain same or change? I would do this in following order assuming only subnet mask going to change.

1. Change the DHCP scope for AP to reflect new subnet mask

2. Change the SVI IP address to reflect the new subnet mask

3. Change the WLC mgt interface using console access to WLC

(WLC) >config interface address management

4. Bounce the APs  & verify those get new IP/mask & register to one of your controller.

HTH

Rasika

**** Pls rate all useful responses ****

Cisco Employee

wireless ap & subnet

whatever change you will do AP will be disconnected and will try to connect again.....

Hall of Fame Super Gold

wireless ap & subnet

a) will the current AP's get disconnected during any of the above changes?

Yes.

b) will any manual reconfiguration be required on the ap's?

Depends on whether IP address is static or DHCP.  If the APs are static, the fastest method would be to download the config of each of the controllers, edit the IP addresses and upload the config back.  Read below for additional instructions.

c) how should the change be carried out, should the switch svi be changed, then controllers & finally the ap's ?

Change the VLAN IP address LAST or you won't be able to start!

We are currently changing our APs to a different VLAN scheme.  So in order to facilitate this, I do the following:

1.  Go to each switch where the APs hang off and change their VLANs.  When this happens, the APs will loose IP Address (DHCP).  This is our situtation.  In your case, if you're just changing subnets, then you can skip this process.

2.  In your case, change the IP address of your WLC.  You may want to consider what I posted in your second question.

3.  Go to your SVI, change the IP address. 

New Member

wireless ap & subnet

Thanks.

For instance, the current subnet is 172.16.30.0 /24(Vlan 16) for both controllers & AP's.

The change will be to subnet 172.16.30.0 /23(Vlan id will continue to remain 16) which means svi & controller both will be affected.

1. on each switch port for ap, no change in vlan is needed.

2. change subnet of both wlc's.

3. change svi ip mask.

is the above correct.

Another concern is , during step 2 will the ap's which are online at that point of time reboot or lose connectivity or we'll have enough time to get this done.

Thanks in advance.

Hall of Fame Super Gold

wireless ap & subnet

during step 2 will the ap's which are online at that point of time reboot or lose connectivity or we'll have enough time to get this done.

APs won't reboot.  APs will just loose momentary connection until you change the SVI.  If the APs' IP Address is DHCP you may need to change that too.

New Member

wireless ap & subnet

Thanks, so they can safely use below steps.

1. change the mask on the ap's

2. change the  mask of wlc

3. change the  mask of switch interface.

Please verify if this steps would be apt for this.

VIP Purple

wireless ap & subnet

You may have to bounce the AP to get new IP with updated subnet mask. Add this as a step.

Also makesure they do this within a mainteance window with outage organized for their wireless service

HTH

Rasika

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