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Occasional Contributor II
Posts: 20
Registered: ‎08-26-2009

change dhcp server

We have an Aruba 6000 mobility controller with four M3 cards.    We have migrated to a new dhcp server recently and to achieve this, I changed the ip- helper address in the cli for all 120 vlans on the master controller. ( I did it via cli so that I could create a script and a backout script easily to copy and paste into the cli ) .   Should this configuration replicate to all the m3 card locals when i type "wr mem" after the configuration change or do I have to replicate this change four fold on all locals as well ?  This would take me ages.   Is there a quicker way of achieving this dhcp server configuration change ?

Guru Elite
Posts: 20,348
Registered: ‎03-29-2007

Re: change dhcp server

It will not replicate to locals. What is the default gateway of your clients, the controller?


Colin Joseph
Aruba Customer Engineering

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Guru Elite
Posts: 8,000
Registered: ‎09-08-2010

Re: change dhcp server

Is the user's default gateway the controller or an upstream switch/router?

You would have to change this on every controller since it is IP information which is local.


Thanks,
Tim

Tim Cappalli | Aruba ClearPass TME
@timcappalli | ACMX #367 / ACCX #480 / ACEAP / CWSP
Occasional Contributor II
Posts: 20
Registered: ‎08-26-2009

Re: change dhcp server

Hi

We have a layer 2 set up with our aruba controller cards all connected to a core switch .

The clients get a default gateway of an interface configured on the core switch.  

 

Does this make sense ?

Occasional Contributor II
Posts: 20
Registered: ‎08-26-2009

Re: change dhcp server

Users default gateway is on the upstream switch .

 

So, I have to go and change the ip-helper address for 120 x 6 ( master, standby master and 4 m3 local cards!!!) . Im going to be busy.

 

Is there any other quicker way …………..what a monotonous task. Well, at least I have scripts ready , I suppose.  

 

Can you see any issue with us migrating  from /24 to /21 vlans in the future to avoid having so many vlans ?  Would there be any issues with broadcasts etc.

Guru Elite
Posts: 8,000
Registered: ‎09-08-2010

Re: change dhcp server

Ok. I would add the helper addresses to your core switch instead of the controller.


Thanks,
Tim

Tim Cappalli | Aruba ClearPass TME
@timcappalli | ACMX #367 / ACCX #480 / ACEAP / CWSP
Guru Elite
Posts: 8,000
Registered: ‎09-08-2010

Re: change dhcp server

The recommendation is to use larger subnets in conjunction with broadcast/multicast optimizations and AirGroup.


Thanks,
Tim

Tim Cappalli | Aruba ClearPass TME
@timcappalli | ACMX #367 / ACCX #480 / ACEAP / CWSP
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