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master discovery - automatic / host or master controller

when provisioning an AP I always wonder about this section:

 

Master Discovery

( ) Use AP Discovery Protocol  

( ) Host Controller IP Address [     ]   Master Controller IP Address/DNS name [     ]

( ) Host Controller Name       [     ]   Master Controller IP Address/DNS name [     ]

 

it defaults to Host Controller Name with only aruba-master filled in I believe.

 

what exactly is the effect of these fields here? is Host equal to Local? is there any reason not to just keep using ADP? why would you enter the name or IP?

 

Guru Elite

Re: master discovery - automatic / host or master controller

aruba-master is the default, and it puts aruba-master in front of any domain suffix it gets through dhcp and tries to resolve it, and find the controller.  The host controller name will put the DNS name, without the suffix of the master controller, if you wanted.

 

If you want to set a fixed ip address you would only go to the second Master Controller ip address/DNS name on the right and put in the ip address.

 



Colin Joseph
Aruba Customer Engineering

Looking for an Answer? Search the Community Knowledge Base Here: Community Knowledge Base

Re: master discovery - automatic / host or master controller

totally clear.

 

but what is the use of the host controller fields? is it just another name for local controller or is it something more?

Guru Elite

Re: master discovery - automatic / host or master controller

The host controller sets the "serverip" variable in the flash of an AP.  On an AP, you can automatically allow it to discover a controller via DNS, DHCP Option or ADP (broadcast/multicast).  If you set it statically, you can set the "master" variable, or the "serverip" variable or even both to find the controller.  The "host controller" portion of the GUI sets the "serverip" variable.  If both are "master" and "serverip" are set:

 

"On the AP, the other end of the GRE tunnel is specified by the IP address configured variable values (in descending order of priority) <master>, <servername>, and <serverip>. If these variable are left to default values, the AP uses DNS to look up aruba-master to discover the IP address of the controller. "

 

Why are both of these variables available?  Way back in the day, it was required to point an AP at a local switch to terminate his GRE or IPSEC tunnel and upgrade its firmware (serverip variable), but still let the AP know who his master controller is to send statistics to.  You no longer have to set both variables manually, so just setting the master variable is all that is needed.  The paragraph above describes what is done if both variables are still set from back in the past.




Colin Joseph
Aruba Customer Engineering

Looking for an Answer? Search the Community Knowledge Base Here: Community Knowledge Base

Re: master discovery - automatic / host or master controller

thank you cjoseph for this clear explanation.

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