ArubaOS and Controllers

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Occasional Contributor II
Posts: 30
Registered: ‎01-19-2010

M3 wired port traffic

We recently set up an M3 controller as a L3 switch/building router and have been seeing some odd behavior. The M3 is the default gateway for the building's wired network - local vlans for data traffic, voice traffic, and access point traffic all terminate at the M3. The M3 has a 10 gig link back into the rest of our WAN with a data transport vlan for routing between buildings.

The building contains ~70 Aruba APs that are tunneled back to another controller in our data center. Their IP addresses are on a vlan that terminates at the building's M3, but their traffic is tunneled back across the WAN.

After finishing this setup, everything appeared to be running normally. We set all interfaces, including the port channel on the M3 to trusted. The M3 was passing all traffic as expected and there were no wired clients showing up in the list (normal behavior for trusted links from my understanding).

After the installation, we started noticing that Macs connected to the wireless APs in the building could not bind to ActiveDirectory, despite no other changes being made. Normal web browsing was fine. After a code update to the AP's controller, the APs on the vlan behind the M3 refused to stay up and constantly power cycled.

We switched the vlan for the APs to a link that went straight to our data center (not through the building's M3) and both the ActiveDirectory binding problem and the AP powercycling problem stopped. These are two very strange problems. We eliminated virtually every other variable and concluded that the M3 was somehow interfering with certain types of traffic passing through the trusted links. As of now, there doesn't seem to be a problem with normal wired traffic. Wired ActiveDirectory binding takes place within the building, so the requests never pass through the M3.

Has anyone experienced anything like this? Is there some security setting that I'm missing in the M3? We're currently running Aruba OS 6.1.2.0.

Mike Graham
Director of Technology
Hempfield School District
Guru Elite
Posts: 20,773
Registered: ‎03-29-2007

Re: M3 wired port traffic

Mike_Graham,

What switching infrastructure do you have the port channel connected to, and what is the configuration on both sides?

Have you tried dissolving the port channel and only using a single link?


Colin Joseph
Aruba Customer Engineering

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

Occasional Contributor II
Posts: 30
Registered: ‎01-19-2010

Re: M3 wired port traffic

We use 3Com for most of our infrastructure. The M3 has a single 10 gig WAN link to a 3Com 8800 and 6 1 gig links to a 3Com 5500 stack for the building network in the port channel. I haven't tried dissolving the port channel yet.

I had posted here awhile ago about input/output errors on a port channel with a 3com switch. That problem has since gone away and the port channel is running without any problems as far as the physical interface goes.
Guru Elite
Posts: 20,773
Registered: ‎03-29-2007

Re: M3 wired port traffic

Please have TAC look at your setup so that they can get to the bottom of your issue.


Colin Joseph
Aruba Customer Engineering

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

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