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dbr
Occasional Contributor I

Least disruptive way to change subnet mask on Aruba7210

Hi all;

 

We are using Aruba 7210s to control around 900 basestations. I need to change the subnet mask (not the IP number) of the management interface due to an earlier configuration mistake. Specifically change from 255.255.252.0 to 255.255.240.0. I am wondering if changing this will cause the controller interface to restart and hence all of the basestations will restart? Or worse will I have to restart the controller?

 

Would it be least disruptive to change the configuration from the GUI or CLI at the console? I should say all of the basestations have their management IP on the same subnet as the management interface.

 

Just trying to get a feel for the best way to get this done.

Re: Least disruptive way to change subnet mask on Aruba7210

You might open a TAC case for this one.

 

I just tried in my lab and the problem you have is that you cannot set the controller-ip on any interface:

(Aruba7005-1) (config) #interface vlan 31
(Aruba7005-1) (config-subif)#ip address 192.168.31.2 255.255.255.0
Error:IP Address Matches the master ip

Which means that you probably need to:

  • Change the controller-ip to another VLAN
  • Reboot
  • Change the ip/subnet
  • Change the controller-ip back to your (changed) VLAN.
  • Reboot

Which is quite interruptive. TAC may see a different option.

--
If you have urgent issues, please contact your Aruba partner or Aruba TAC (click for contact details).
dbr
Occasional Contributor I

Re: Least disruptive way to change subnet mask on Aruba7210

Hi Herman;

 

Thank-you so much for trying this for me; that's so good of you.

 

Looking at the behaviour of the controller it's not unlike the HP (cough I mean Aruba) Procurve switches. I suppose I could type:

 

#interface vlan 31
#no ip address 192.168.31.2 255.255.252.0
#ip address 192.168.31.2 255.255.240.0

#wr mem

 

... but then that of course would interupt the controller's network connectivity which is of course what I'm trying to avoid.

 

Even if the GUI approach worked with one click all that will do would be to write out the commands in a similar way as above I would imagine.

 

I will ask TAC as you suggest. See what they say. 

 

Drew

dbr
Occasional Contributor I

Re: Least disruptive way to change subnet mask on Aruba7210

Finally had permission to try this change and I could not get it to work. Would be useful if someone could tell me where I am going wrong. Remember I'm trying just change the subnet mask from 255.255.252.0 to 255.255.240.0. 

 

I thought I may be able to try 

no ip address 10.5.127.201 255.255.252.0

and then

ip address 10.5.127.201 255.255.240.0

 

However I can't type no ip address as I get the message:

IP address allocated from the Branch controller pool

 

(config-subif)#no ip address ?
internal IP address allocated from the Branch controller pool
<cr>

then:

(config-subif)#no ip address internal
IP address internal is only applicable within the branch-config group

 

I note the controller vlan is referenced under the entry

 

controller-ip vlan 1403

 

Do I first have to try

 

no controller-ip vlan 1403

 

then reboot, then change the ip and mask, then put the controller-ip entry in again? Or will I have to create a temporary VLAN to allocate to the controller-ip? I'm doing all of this from the console so I don't need to keep IP connectivity to the management interface working.

 

I think that's what you were suggesting Herman I'm just wanting to be sure!

 

Drew

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