Wireless Access

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Occasional Contributor I

Aruba DHCP option 43 configuration

I have tried to configure Aruba access point to discover the controller using option 43 since the controllers and the access points are separated by layer three. For details below is the information:

Controllers:

 

Aruba 2X7210 as a master controllers.

Aruba 2X7220 as a local controllers. 

 

The access point is connected to the Access switches (cisco 2960X PoE) and the access switch is connected to core switch (S12708). The access to core switch connectivity is trunk and the vlans are allowed to pass through and the access point gets a DHCP address, but the access point can't discover master controller and restarting frequently. 

Below is the DHCP configuration on Huawei switch: 

 

ip pool 180
gateway-list 10.6.180.1
network 10.6.180.0 mask 255.255.255.128
excluded-ip-address 10.6.180.2 10.6.180.10
lease unlimited
dns-list 10.90.10.31 10.90.10.28 4.2.2.2
option 60 ascii "ArubaAP"
option 43 sub-option 2 ip-address 10.6.181.18

 

 

Any help would be appreciated

 

Re: Aruba DHCP option 43 configuration

Can you capture the console messages from an AP that's attempting to boot?


Charlie Clemmer
Aruba Customer Engineering
Occasional Contributor I

Re: Aruba DHCP option 43 configuration

As you see it on the screen shot, the DHCP is offering the IP address, but the VRRP address of the contorller is not included.

and it restarts frequently.

 

Thanks 

MVP

Re: Aruba DHCP option 43 configuration

Looking at the screenshot your AP gets an IP from 10.6.180.128/25 and not 10.6.180.0/25 which you have provided configuration for in your first post.

 

Should it be like that?

Aranya AB, Sweden
ACMP, ACCA, CWNA, CWDP
Occasional Contributor I

Re: Aruba DHCP option 43 configuration

 

Sorry for that particular mistak since i only post the indoor and send you the screen capture of an outdoor AP!

 

The 10.6.180.0/25 is for indoor and 10.6.180.128/25 is for Outdoor Access points. Below is the full configurations:

 

#Indoor management IP

 

ip pool 180

gateway-list 10.6.180.1

network 10.6.180.0 mask 255.255.255.128

excluded-ip-address 10.6.180.2 10.6.180.10

lease unlimited

option 43 sub-option 2 ip-address 10.6.181.18

option 60 sub-option 3 ascii "ArubaAP"

 

#Outdoor Management IP

 

ip pool 184

gateway-list 10.6.180.129

network 10.6.180.128 mask 255.255.255.128

excluded-ip-address 10.6.180.130 10.6.180.139

lease unlimited

option 43 sub-option 2 ip-address 10.6.181.18

option 60 sub-option 3 ascii "ArubaAP"

MVP

Re: Aruba DHCP option 43 configuration

No Worries,

 

Did you try to do option 43 as ASCII-text instead?

Aranya AB, Sweden
ACMP, ACCA, CWNA, CWDP
Occasional Contributor I

Re: Aruba DHCP option 43 configuration

Huawei switch doesn't have ascii code for option 43. Only hexa and ip address.

MVP

Re: Aruba DHCP option 43 configuration

I see,

 

My next step would be:

1. Try with HEX (just for the sake)

2. Mirror a port in your cisco and capture the DHCP responses from the server and view the packets (wireshark).

3. If able, use DNS discovery instead.

 

Aranya AB, Sweden
ACMP, ACCA, CWNA, CWDP

Re: Aruba DHCP option 43 configuration


@Fekadu Mekonen wrote:

Huawei switch doesn't have ascii code for option 43. Only hexa and ip address.


From the output captured in Restarting.JPG, the top two lines indicate that the AP is not able to determine the master IP. It may be an issue with how Huawei is providing the option, or could also be a problem with how option 60 is handled from the Huawei side. Is there another DHCP server you can try?

 

You may need to packet capture the AP startup to see the exact DHCP exchange to look for issues.


Charlie Clemmer
Aruba Customer Engineering

Re: Aruba DHCP option 43 configuration


@dojjan wrote:

I see,

 

My next step would be:

1. Try with HEX (just for the sake)

2. Mirror a port in your cisco and capture the DHCP responses from the server and view the packets (wireshark).

3. If able, use DNS discovery instead.

 


One more reason why I like the DNS discovery method ... easier to troubleshoot the response without worrying about hex vs ascii.


Charlie Clemmer
Aruba Customer Engineering
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