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Occasional Contributor II
Posts: 20
Registered: ‎04-28-2016

Too low speed that I expected on IAP-277 Point-to-Point Bridging(Mesh Portal/Point)

Dear All,

I have configured Point-to-Point Briding on IAP-277(Mesh Portal/Point) like below topology.

P2P Testing Topology.jpg

 

I got this kind of result of Mesh link estabished.

show ap mesh link.JPG 

HT-Detials is VHT-80Mhz-3ss. According to 802.11ac specfication I am expecting around 1.3Gbps speed.

802.11ac achievable link rates.JPG

 

But, Real Speed of IAP-277 Point-to-Point Bridging I have gotten is around 100~150Mbps maximum.

iperf3 traffic statics-duplex.JPG

Test environment is as below.

-Indoor Lab testing environment.

-The distance between IAP-277 is 10m long.

-Traffic generator is "iperf3.exe".

 

Question #1: Is it normal speed of IAP-277 ,  Missconfiguration or H/W problem?

 

Question #2: if not a H/W Problem, any suggestion or configuration setting to optimize and speed up to 1.3Gbps on IAP-277?

 

Question #3: the speed difference between AP#1->AP#2(Around 100Mbps) and AP#1 <- AP#2(Around 10Mbps) is too high I think. How do I make both speed as almost equal? Give me some configuration command or suggestions for this.

 

FYI, I attached some of tech support files.

 

Regards,

Moon-Kee Bahk. 

Guru Elite
Posts: 21,491
Registered: ‎03-29-2007

Re: Too low speed that I expected on IAP-277 Point-to-Point Bridging(Mesh Portal/Point)

You have three issues that I can see:

 

min-tx-power 24  <------Min and max should be 12  TX power of 24 can cause distortion and cause throughput issues
max-tx-power 127

rf dot11a-radio-profile
spectrum-monitor  <-------Remove this, because it can lower throughput

 

If you do an iperf, you need to include -w512k to make the windows size 512k

 

You will not get 1.3ghz because wireless is half duplex....  You would be lucky if you get half of that.

 



Colin Joseph
Aruba Customer Engineering

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

Occasional Contributor II
Posts: 20
Registered: ‎04-28-2016

Re: Too low speed that I expected on IAP-277 Point-to-Point Bridging(Mesh Portal/Point)

Dear Colin Joseph,

 

Thanks about your wonderful comment for us.
I got around 315Mbps max speed after applying with your comment. but still hungry regarding speed.

Even our testing lab is not located in electromagnetic shielded room, but I expect around speed half of 1.3Gbps speed.  we cannot see any channel interference, also.

 

Regards,

 

Moon-Kee Bahk.

Occasional Contributor II
Posts: 24
Registered: ‎09-02-2015

Re: Too low speed that I expected on IAP-277 Point-to-Point Bridging(Mesh Portal/Point)

Distance 10m ? Make that a greater distance or lower tx power.
Cheers,
Frank
Life off the wire
Guru Elite
Posts: 21,491
Registered: ‎03-29-2007

Re: Too low speed that I expected on IAP-277 Point-to-Point Bridging(Mesh Portal/Point)


Moon-Kee Bahk wrote:

Dear Colin Joseph,

 

Thanks about your wonderful comment for us.
I got around 315Mbps max speed after applying with your comment. but still hungry regarding speed.

Even our testing lab is not located in electromagnetic shielded room, but I expect around speed half of 1.3Gbps speed.  we cannot see any channel interference, also.

 

Regards,

 

Moon-Kee Bahk.


Mr. zero is correct.

 

Mimo relies on multiple paths to get better performance.  If the APs are close too each other, they have line of sight and there is only a single path.  Make the distance greater between them and put an object between the two APs.

 

Next, try the following parameters for iperf:

 

iperf -c <ip address of server> -w 1M -t 300 -I 5

 

 

 

 



Colin Joseph
Aruba Customer Engineering

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

MVP
Posts: 1,404
Registered: ‎11-07-2008

Re: Too low speed that I expected on IAP-277 Point-to-Point Bridging(Mesh Portal/Point)

At that distance, even a power of zero is likely still driving the radios pretty high and will cut down on throughput. Also, in case you aren't, you should be pushing 6-8 TCP streams across that link as well, not just a single stream.

Jerrod Howard
Sr. Techical Marketing Engineer
Occasional Contributor II
Posts: 17
Registered: ‎02-12-2014

Re: Too low speed that I expected on IAP-277 Point-to-Point Bridging(Mesh Portal/Point)

As there are no clients to be served by the IAPs, what is the maximum p2p link speed in this case in theory?

Is there any option to utilize both radios to enhance the throughput?

MVP
Posts: 1,404
Registered: ‎11-07-2008

Re: Too low speed that I expected on IAP-277 Point-to-Point Bridging(Mesh Portal/Point)

We have seen max speeds of around 700Mbps in the most ideal cases when testing PtP, but real world speeds would be 500-600Mbps in clean channels with VHT80 (which again if there's any interference anywhere in the 80Mhz spectrum, that speed will drop). 274_5712_PtP.png

Jerrod Howard
Sr. Techical Marketing Engineer
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