Wireless Access

Reply
Aruba Employee

GRE tunnel

Hi ,

 

Have to create the set up with Access Point and Aruba controller.

 

Topology :

-------------

 

AccessPoint <-----> DistributionSwitch <-----> AccessController

 

Management has configured on both AP and AC and they are in same subnet.

 

What is the minimum configuration required on AccessController to bring up GRE tunnel b/w AP and AC.

 

Appreciate your quick response.

 

Guru Elite

Re: GRE tunnel

Nothing.  A new AP should find the controller via broadcast and then attach to it.  It will then configure itself with whatever is in the default AP group on the AC.

 



Colin Joseph
Aruba Customer Engineering

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

Aruba Employee

Re: GRE tunnel

Thanks Joseph , as per my understanding is it Layer2 GRE tunnel ?

 

 

Guru Elite

Re: GRE tunnel

I do not know.  It is not configurable.



Colin Joseph
Aruba Customer Engineering

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

Occasional Contributor II

Re: GRE tunnel

Hello.
GRE is not running on L2. It's L3 protocol, then IP addresses on both (AP and MC) is a must.
I think that as default it is GRE, but Control Plane Security must be disabled (default enabled).
If CP Sec is enabled, it will be IPSEC tunnel.

J.
Guru Elite

Re: GRE tunnel

Both layer2 and layer3 GRE tunnels require source and destination ip addresses in their definition to determine the two devices they are connecting.  Layer3 tunnels have a separate "inner" ip address in addition to source and destination addresses.  On a layer3 tunnel, you would have to have a route to get traffic into that tunnel.  On a layer2 tunnel you would just bridge traffic into that tunnel and not have to worry about routing.

 

The purpose of a GRE tunnel on an access point address is to bridge user traffic from the access point to the controller.  Only a layer2 tunnel is required for this.



Colin Joseph
Aruba Customer Engineering

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

Aruba Employee

Re: GRE tunnel

cjoseph wrote :

----------------------------------------------------------------------------------------------------------------------------------

Both layer2 and layer3 GRE tunnels require source and destination ip addresses in their definition

to determine the two devices they are connecting.

----------------------------------------------------------------------------------------------------------------------------------

 

As per above statement , i understood AP is Layer3 switch ?

 

Am new to WLAN and also to Aruba products so asking above basic question.

 

 

Guru Elite

Re: GRE tunnel


rajshekarreddy wrote:

cjoseph wrote :

----------------------------------------------------------------------------------------------------------------------------------

Both layer2 and layer3 GRE tunnels require source and destination ip addresses in their definition

to determine the two devices they are connecting.

----------------------------------------------------------------------------------------------------------------------------------

 

As per above statement , i understood AP is Layer3 switch ?

 

Am new to WLAN and also to Aruba products so asking above basic question.

 

 


To be clear, the GRE tunnel in an access point is to tunnel WLAN and possibly wired traffic back to the controller.  The GRE configuration cannot be changed, or configured because it is administrative.

 

I did not say that the AP is a layer 3 switch.  Your internal Aruba resources would have much more detailed information.

 



Colin Joseph
Aruba Customer Engineering

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

Aruba Employee

Re: GRE tunnel

DHCP will assign ip address to AP's physical port or any other circuit ?

 

Answer to above question will clarify some of my doubts.

 

Is there any command available to check where exactly this ip address assigned on AP.

Super Contributor II

Re: GRE tunnel

what i understand from this post it.. If we deploy AP's as Campus AP's
In Tunnel mode.. if control plane security is disable the AP and MC will form GRE tunnel and if CP is off, the AP and MC will form IP Sec tunnel.
True??
Thanks & Regards
Syed Murad Ali
ACMP ACMA CCNA
Search Airheads
cancel
Showing results for 
Search instead for 
Did you mean: