Main Nav

Hi Folks,

 

We’re experiencing a significant number of problems where our PoE switches report that Aruba AP-105s are drawing more than 15.4W.  When this happens our switches shut off the power to the offending AP.  The problem is intermittent, but seems to occur repeatedly on the same APs, while never occurring on other APs.  Our diagnostics have eliminated excessive loss in the cabling as the culprit, which seems to leave two possibilities.  Either there are some Aruba AP-105s which are using more power than they are supposed to, or our switches are incorrectly measuring the power consumption of the APs.  If the APs are at fault, it’s unlikely that we would be the only ones with this problem.  Is anybody else having any issues with Aruba AP-105s drawing more than 15.4W?

 

Thanks,

 

Chuck Enfield

Sr. Communications Engineer

Telecommunications & Networking Services

The Pennsylvania State University

110H, USB2, UP, PA 16802

ph: 814.863.8715

fx: 814.865-3988

 

 

********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.

Comments

We've had close to 5% of these AP 105's with the same problem.  I send them in for a replacement and Aruba has been excellent in replacing them for free.  Some were like this brand new, others did it after a year or more.


Message from john.chanowski@utoledo.edu

I have one recent confirmed case of an AP105 drawing just north of 19W. The AP was also intermittently dropping off the network(that’s the reason I found it was drawing 19W) so I thought something had to be wrong with it and replaced it. I have had several similar cases of AP105s intermittently but regularly dropping before this but never thought to check the power draw on them.

 

On Wed, 7 Nov 2012, Chuck Enfield wrote: > Hi Folks, > > We’re experiencing a significant number of problems where our PoE switches > report that Aruba AP-105s are drawing more than 15.4W.  When this happens > our switches shut off the power to the offending AP.  The problem is > intermittent, but seems to occur repeatedly on the same APs, while never > occurring on other APs.  Our diagnostics have eliminated excessive loss in > the cabling as the culprit, which seems to leave two possibilities.  Either > there are some Aruba AP-105s which are using more power than they are > supposed to, or our switches are incorrectly measuring the power consumption > of the APs.  If the APs are at fault, it’s unlikely that we would be the > only ones with this problem.  Is anybody else having any issues with Aruba > AP-105s drawing more than 15.4W? Yes, We have a few ap105s sitting in a box with this exact issue. It doesn't appear the be the switch in that we have seen it occur on both cisco 3560-X and juniper ex3300 switches. Jason > >   > > Thanks, > >   > > Chuck Enfield > > Sr. Communications Engineer > > Telecommunications & Networking Services > > The Pennsylvania State University > > 110H, USB2, UP, PA 16802 > > ph: 814.863.8715 > > fx: 814.865-3988 > >   > >   > > ********** Participation and subscription information for this EDUCAUSE > Constituent Group discussion list can be found at > http://www.educause.edu/groups/. > > > /* Jason Cash IT/Network and Systems Services University of Delaware, Newark Delaware e:cash@udel.edu v: 302-831-0461 */ ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.

We have performed exhaustive troubleshooting with this particular issue.  We tested several switches and found the problem to be the AP.  We have been working with Aruba over the past several weeks (months) and they have determined that the 5Ghz radio profile with the scanning option enabled, causes this phenomena. When the radio comes off scanning, it sends a single broadcast packet that pushes the power on the 5Ghz PA over the AF limits.  Aruba has provided a custom build which we are going to test and implement tomorrow.  Aruba feels confident that the software change will solve the issue.  They have performed an exhaustive engineering review of the components and determined it to be software based.  

I will post results of our upgrade in the next couple of days.

Michael Hulko

On 2012-11-07, at 3:05 PM, Jason S. Cash wrote:

On Wed, 7 Nov 2012, Chuck Enfield wrote:

Hi Folks,
We’re experiencing a significant number of problems where our PoE switches
report that Aruba AP-105s are drawing more than 15.4W.  When this happens
our switches shut off the power to the offending AP.  The problem is
intermittent, but seems to occur repeatedly on the same APs, while never
occurring on other APs.  Our diagnostics have eliminated excessive loss in
the cabling as the culprit, which seems to leave two possibilities.  Either
there are some Aruba AP-105s which are using more power than they are
supposed to, or our switches are incorrectly measuring the power consumption
of the APs.  If the APs are at fault, it’s unlikely that we would be the
only ones with this problem.  Is anybody else having any issues with Aruba
AP-105s drawing more than 15.4W?

Yes, We have a few ap105s sitting in a box with this exact issue. It doesn't appear the be the switch in that we have seen it occur on both cisco 3560-X and juniper ex3300 switches.


Jason


 
Thanks,
 
Chuck Enfield
Sr. Communications Engineer
Telecommunications & Networking Services
The Pennsylvania State University
110H, USB2, UP, PA 16802
ph: 814.863.8715
fx: 814.865-3988
 
 
********** Participation and subscription information for this EDUCAUSE
Constituent Group discussion list can be found at
http://www.educause.edu/groups/.


/*   Jason Cash  IT/Network and Systems Services
      University of Delaware, Newark Delaware
        e:cash@udel.edu  v: 302-831-0461           */

**********
Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.



Michael Hulko
Network Analyst

Western University Canada
Network Operations Centre
Information Technology Services
1393 Western Road, SSB 3300CC
London, Ontario  N6G 1G9

tel: 519-661-2111 x81390
e-mail: mihulko@uwo.ca <mailto:mihulko@uwo.ca>





********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.

Thanks for the replies. Our Aruba SE called and said that they have identified the problem and are working on a fix. If you're experiencing this problem I suggest you contact Aruba TAC. Chuck

We have been working with Aruba on this exact issue as well.  We have had the custom build in place since last Friday morning.  We’ve lost one 105 since the upgrade to the custom build, but nothing since.  What is hard to tell is what APs were on the brink of failing before we installed the custom build.  Aruba support and sales has been extremely impressive to work with on this issue, and when it comes to support I am not easily impressed.  We replaced our Cisco install with Aruba here this summer.

 

 

Fyi,

Brian

 

As a stop gap measure, we increased the available power to 25W on the port of the affected AP, assuming the switch can be configured.  We use HP.
This issue may have shortened the life of the AP, specifically the 5Ghz radios, but if an AP does go hard down, and if you have purchased the appropriate support, it's unfortunately nothing more than a RMA with Aruba to get them replaced.

MH

On 2012-11-07, at 3:32 PM, Kellogg, Brian D. wrote:

We have been working with Aruba on this exact issue as well.  We have had the custom build in place since last Friday morning.  We’ve lost one 105 since the upgrade to the custom build, but nothing since.  What is hard to tell is what APs were on the brink of failing before we installed the custom build.  Aruba support and sales has been extremely impressive to work with on this issue, and when it comes to support I am not easily impressed.  We replaced our Cisco install with Aruba here this summer.
 
 
Fyi,
Brian
 
Close
Close


Annual Conference
September 29–October 2
Register Now!

Events for all Levels and Interests

Whether you're looking for a conference to attend face-to-face to connect with peers, or for an online event for team professional development, see what's upcoming.

Close

Digital Badges
Member recognition effort
Earn yours >

Career Center


Leadership and Management Programs

EDUCAUSE Institute
Project Management

 

 

Jump Start Your Career Growth

Explore EDUCAUSE professional development opportunities that match your career aspirations and desired level of time investment through our interactive online guide.

 

Close
EDUCAUSE organizes its efforts around three IT Focus Areas

 

 

Join These Programs If Your Focus Is

Close

Get on the Higher Ed IT Map

Employees of EDUCAUSE member institutions and organizations are invited to create individual profiles.
 

 

Close

2014 Strategic Priorities

  • Building the Profession
  • IT as a Game Changer
  • Foundations


Learn More >

Uncommon Thinking for the Common Good™

EDUCAUSE is the foremost community of higher education IT leaders and professionals.