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3702i only getting 10MB/s transfer speed

I am in the process of configuring a 3702i access point, but I am running into an issue where I cannot get over 10MB/s. I have the access point plugged into a gigabit port and have a power adapter plugged into the 3702i since I do not have a POE+ capable switch. I only get around 5MB/s on 2.4GHz radio and 10MB/s on the 5GHz radio which is not any faster than our old aironet 1100 AP. I have tried messing with the data rates but it does not make a difference. The properties on my wireless card show that the connection speed is 217Mbps.

Below is the switchport settings and I attached my configuration file if that helps at all.

4506-2#show run interface gi6/48
Building configuration...

Current configuration : 213 bytes
!
interface GigabitEthernet6/48
 switchport access vlan 95
 switchport trunk encapsulation dot1q
 switchport trunk native vlan 95
 switchport trunk allowed vlan 94,95
 switchport mode trunk
 no cdp enable
end

 

1 ACCEPTED SOLUTION

Accepted Solutions
VIP Purple

Hi Matthew,

Hi Matthew,

Thanks for the output. 

I think you confuse PHY data rate & throughput.  As you said you got 405Mbps connection speed, which is actually the PHY data rate, not the throughput. Since wireless client & AP use lots of control & management frame, those will consume the RF air time. Only payload component of data frame contribute for throughput. So throughput will always much less than PHY rate.

In the given situation you got 17MB/s (17x8 = 136Mbps) as throughput which is around 34% of your PHY. Typically you could get 50-60% of PHY as throughput  in good RF environment.

If you see below, you can see even with 80MHz channel width your client associated in 40MHz, indicating your client is only support 802.11n (not 802.11ac). If you look at this MCS data rates table you will see 405Mbps is the highest PHY you can get with 40MHz, Long Guard Interval with 3 Spatial Stream (SS).

If you have 802.11ac capable client you will see these PHY rate increase accordingly with channel width of 80 MHz (1SS-433Mbps, 2SS-867 Mpbs, 3SS-1300 Mpbs) 

Before

Current Rate      : m23-               Capability       : WMM 11h
Supported Rates   : 6.0 9.0 12.0 18.0 24.0 36.0 48.0 54.0 m0-2 m1-2 m2-2 m3-2 m4-2 m5-2 m6-2 m7-2 m8-2 m9-2 m10-2 m11-2 m12-2 m13-2 m14-2 m15-2 m16-2 m17-2 m18-2 m19-2 m20-2 m21-2 m22-2 m23-2
Voice Rates       : disabled           Bandwidth        : 20 MHz
Signal Strength   : -62  dBm           Connected for    : 302 seconds
Signal to Noise   : 35  dB            Activity Timeout : 20 seconds

After

Current Rate      : m23b               Capability       : WMM 11h
Supported Rates   : 6.0 9.0 12.0 18.0 24.0 36.0 48.0 54.0 m0-2 m1-2 m2-2 m3-2 m4-2 m5-2 m6-2 m7-2 m8-2 m9-2 m10-2 m11-2 m12-2 m13-2 m14-2 m15-2 m16-2 m17-2 m18-2 m19-2 m20-2 m21-2 m22-2 m23-2
Voice Rates       : disabled           Bandwidth        : 40 MHz
Signal Strength   : -67  dBm           Connected for    : 259 seconds
Signal to Noise   : 27  dB            Activity Timeout : 15 seconds

Refer this for some of the 802.11ac test I have done. As you can see you cannot get throughput that matches PHY rates. If you get 50-60% of PHY as throughput, that is pretty good in practical.

http://mrncciew.com/2014/01/10/802-11ac-with-cisco-3700-ap/ 

 

HTH

Rasika

**** Pls rate all useful responses ****

9 REPLIES
Hall of Fame Super Gold

I am in the process of

I am in the process of configuring a 3702i access point, but I am running into an issue where I cannot get over 10MB/s. I have the access point plugged into a gigabit port and have a power adapter plugged into the 3702i since I do not have a POE+ capable switch. 

Post the output to the command "sh interface G6/48" from the switch.  

 

Your description sounds like the cable length from the switch port to the AP is >100 metres.

Here is the output from the

Here is the output from the show interface G6/48 command. I masked off part of the MAC address.

 

4506#show interfaces g6/48
GigabitEthernet6/48 is up, line protocol is up (connected)
  Hardware is Gigabit Ethernet Port, address is 001b.xxxx.xxxx (bia 001b.xxxx.xxxx)
  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 1000Mb/s, link type is auto, media type is 10/100/1000-TX
  input flow-control is off, output flow-control is off
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:53, output never, output hang never
  Last clearing of "show interface" counters 00:02:50
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 52000 bits/sec, 95 packets/sec
  5 minute output rate 1800000 bits/sec, 169 packets/sec
     34361 packets input, 2431142 bytes, 0 no buffer
     Received 167 broadcasts (80 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 input packets with dribble condition detected
     56978 packets output, 78129378 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier
     0 output buffer failures, 0 output buffers swapped out

VIP Purple

Hi

Hi

802.11ac only works in 5GHz band.  Also 802.11n with 40MHz only work on 5GHz, So you have to really use 5GHz band to get the high throughput.

I think you should set the channel width to 80MHz as shown below & advertise SSID on that band.

interface Dot11Radio1
 channel width 80
 no shutdown

 

Post the output of "show dot11 ass <clinet_mac_address>" to see what are the association details of that client.

HTH

Rasika

**** Pls rate all useful responses ****

 

After changing the channel

After changing the channel width to 80MHz I get an average of 17MB/s transfer speed and it shows that my connection speed is 405Mbps which should give me around 50MB/s.

Wired I get an average of 100MB/s-112MB/s for my transfer speed

Before Changing to 80MHz

c3702-1#show dot11 associations all-client
Address           : 0024.xxxx.xxxx     Name             : c3702-1
IP Address        : 192.168.95.91      IPv6 Address        : ::
Gateway Address   : 0.0.0.0
Netmask Address   : 0.0.0.0            Interface        : Dot11Radio 1
Bridge-group        : 1
reap_flags_1        : 0x0     ip_learn_type       : 0x0       transient_static_ip : 0x0
Device            : ccx-client         Software Version : NONE
CCX Version       : 4                  Client MFP       : Off

State             : EAP-Assoc          Parent           : self
SSID              : vlan95n
VLAN              : 95
Hops to Infra     : 1                  Association Id   : 1
Clients Associated: 0                  Repeaters associated: 0
Tunnel Address    : 0.0.0.0
Key Mgmt type     : WPAv2              Encryption       : AES-CCMP
Current Rate      : m23-               Capability       : WMM 11h
Supported Rates   : 6.0 9.0 12.0 18.0 24.0 36.0 48.0 54.0 m0-2 m1-2 m2-2 m3-2 m4-2 m5-2 m6-2 m7-2 m8-2 m9-2 m10-2 m11-2 m12-2 m13-2 m14-2 m15-2 m16-2 m17-2 m18-2 m19-2 m20-2 m21-2 m22-2 m23-2
Voice Rates       : disabled           Bandwidth        : 20 MHz
Signal Strength   : -62  dBm           Connected for    : 302 seconds
Signal to Noise   : 35  dB            Activity Timeout : 20 seconds
Power-save        : Off                Last Activity    : 0 seconds ago
Apsd DE AC(s)     : NONE

Packets Input     : 34487              Packets Output   : 51847
Bytes Input       : 2250174            Bytes Output     : 76757696
Duplicates Rcvd   : 1                  Data Retries     : 36241
Decrypt Failed    : 0                  RTS Retries      : 0
MIC Failed        : 0                  MIC Missing      : 0
Packets Redirected: 0                  Redirect Filtered: 0
IP source guard failed : 0             PPPoE passthrough failed : 0
DAI failed : IP mismatch  : 0             src MAC mismatch : 0             target MAC mismatch : 0
Existing IP failed :  0              New IP failed :  0
11w Status       : Off
Session timeout   : 0 seconds
Reauthenticate in : never


After Changing to 80MHz

c3702-1#show dot11 associations all-client
Address           : 0024.xxxx.xxxx    Name             : c3702-1
IP Address        : 192.168.95.91      IPv6 Address        : ::
Gateway Address   : 0.0.0.0
Netmask Address   : 0.0.0.0            Interface        : Dot11Radio 1
Bridge-group        : 1
reap_flags_1        : 0x0     ip_learn_type       : 0x0       transient_static_ip : 0x0
Device            : ccx-client         Software Version : NONE
CCX Version       : 4                  Client MFP       : Off

State             : EAP-Assoc          Parent           : self
SSID              : vlan95n
VLAN              : 95
Hops to Infra     : 1                  Association Id   : 1
Clients Associated: 0                  Repeaters associated: 0
Tunnel Address    : 0.0.0.0
Key Mgmt type     : WPAv2              Encryption       : AES-CCMP
Current Rate      : m23b               Capability       : WMM 11h
Supported Rates   : 6.0 9.0 12.0 18.0 24.0 36.0 48.0 54.0 m0-2 m1-2 m2-2 m3-2 m4-2 m5-2 m6-2 m7-2 m8-2 m9-2 m10-2 m11-2 m12-2 m13-2 m14-2 m15-2 m16-2 m17-2 m18-2 m19-2 m20-2 m21-2 m22-2 m23-2
Voice Rates       : disabled           Bandwidth        : 40 MHz
Signal Strength   : -67  dBm           Connected for    : 259 seconds
Signal to Noise   : 27  dB            Activity Timeout : 15 seconds
Power-save        : Off                Last Activity    : 5 seconds ago
Apsd DE AC(s)     : NONE

Packets Input     : 77863              Packets Output   : 147266
Bytes Input       : 4979788            Bytes Output     : 221483209
Duplicates Rcvd   : 1                  Data Retries     : 46004
Decrypt Failed    : 0                  RTS Retries      : 0
MIC Failed        : 0                  MIC Missing      : 0
Packets Redirected: 0                  Redirect Filtered: 0
IP source guard failed : 0             PPPoE passthrough failed : 0
DAI failed : IP mismatch  : 0             src MAC mismatch : 0             target MAC mismatch : 0
Existing IP failed :  0              New IP failed :  0
11w Status       : Off
Session timeout   : 0 seconds
Reauthenticate in : never

VIP Purple

Hi Matthew,

Hi Matthew,

Thanks for the output. 

I think you confuse PHY data rate & throughput.  As you said you got 405Mbps connection speed, which is actually the PHY data rate, not the throughput. Since wireless client & AP use lots of control & management frame, those will consume the RF air time. Only payload component of data frame contribute for throughput. So throughput will always much less than PHY rate.

In the given situation you got 17MB/s (17x8 = 136Mbps) as throughput which is around 34% of your PHY. Typically you could get 50-60% of PHY as throughput  in good RF environment.

If you see below, you can see even with 80MHz channel width your client associated in 40MHz, indicating your client is only support 802.11n (not 802.11ac). If you look at this MCS data rates table you will see 405Mbps is the highest PHY you can get with 40MHz, Long Guard Interval with 3 Spatial Stream (SS).

If you have 802.11ac capable client you will see these PHY rate increase accordingly with channel width of 80 MHz (1SS-433Mbps, 2SS-867 Mpbs, 3SS-1300 Mpbs) 

Before

Current Rate      : m23-               Capability       : WMM 11h
Supported Rates   : 6.0 9.0 12.0 18.0 24.0 36.0 48.0 54.0 m0-2 m1-2 m2-2 m3-2 m4-2 m5-2 m6-2 m7-2 m8-2 m9-2 m10-2 m11-2 m12-2 m13-2 m14-2 m15-2 m16-2 m17-2 m18-2 m19-2 m20-2 m21-2 m22-2 m23-2
Voice Rates       : disabled           Bandwidth        : 20 MHz
Signal Strength   : -62  dBm           Connected for    : 302 seconds
Signal to Noise   : 35  dB            Activity Timeout : 20 seconds

After

Current Rate      : m23b               Capability       : WMM 11h
Supported Rates   : 6.0 9.0 12.0 18.0 24.0 36.0 48.0 54.0 m0-2 m1-2 m2-2 m3-2 m4-2 m5-2 m6-2 m7-2 m8-2 m9-2 m10-2 m11-2 m12-2 m13-2 m14-2 m15-2 m16-2 m17-2 m18-2 m19-2 m20-2 m21-2 m22-2 m23-2
Voice Rates       : disabled           Bandwidth        : 40 MHz
Signal Strength   : -67  dBm           Connected for    : 259 seconds
Signal to Noise   : 27  dB            Activity Timeout : 15 seconds

Refer this for some of the 802.11ac test I have done. As you can see you cannot get throughput that matches PHY rates. If you get 50-60% of PHY as throughput, that is pretty good in practical.

http://mrncciew.com/2014/01/10/802-11ac-with-cisco-3700-ap/ 

 

HTH

Rasika

**** Pls rate all useful responses ****

Correct, I am currently

Correct, I am currently testing from a wireless n client. For another test I moved the access point into my office and I am able to get 30MB/s of data transfer speed and my connect speed shows that it is connected at 450Mbps. Since I have less RF interference in my office I am getting between the 50-60% of the PHY throughput. I will see if I can find a laptop with a 802.11ac network adapter in it to do some more testing. Thanks for your help.

 

Current Rate      : m23b               Capability       : WMM 11h
Supported Rates   : 6.0 9.0 12.0 18.0 24.0 36.0 48.0 54.0 m0-2 m1-2 m2-2 m3-2 m4-2 m5-2 m6-2 m7-2 m8-2 m9-2 m10-2 m11-2 m12-2 m13-2 m14-2 m15-2 m16-2 m17-2 m18-2 m19-2 m20-2 m21-2 m22-2 m23-2
Voice Rates       : disabled           Bandwidth        : 40 MHz
Signal Strength   : -41  dBm           Connected for    : 661 seconds
Signal to Noise   : 53  dB            Activity Timeout : 16 seconds

 

VIP Purple

Yes, that client is in is

Yes, that client is in is much better RF environment & you can see the difference (240Mbps throughput). Note that this time you got high RSSI (-41dBm) & high SNR (53 dB) which also contributed to better result. When you move your client away from the AP you will see these RSSI & SNR reduces & accordingly client throughput reduce as well. 

As a guideline, you should have SNR of 25 or more to have good performance.

Yes, please do test with 802.11ac client & have some performance baseline in your environment. That will help you to identify any performance issues down the track at your environment.(as you can compare result with those values)

 

HTH

Rasika

*** Pls rate all useful responses ****

Cisco Employee

Hi,Just do "sh client detail

Hi,

Just do "sh client detail <mac-address>" to see with which data rate WLC thinks you are connected.Currently it is showing 217 which is normally highest for 11ac without any channel bonding etc. The speed you are actually getting is equivalent to traditional 802.11a/b/g networks.

I would suggest even before starting Tshoot:

> Which tool you are using to conclude the speed as 10MB/s.

> Check the speed you are getting while accessing same resource from a Wired PC.

> Just use "Iperf" test to see the throughput when accessing any Internal wired resource if you have not tested that.

 

Regards

Dhiresh

**Please rate helpful posts**

 

Cisco Employee

Hi ,Good catch..Never noticed

Hi ,

Good catch..Never noticed that B...So now it makes sense

10MBps=80Mbps.

for 20 Mhz...217 is the Physical speed which is half duplex speed , so normally divide by 2 to get the expected throughput idea..which comes 105 Mbps nearly. Reaching out up to this maximum will require Clean RF, closeness to the AP,Use of short Guard Interval,Use of AMPDU/AMSDU etc.

Regards

Dhiresh

**Please rate helpful posts**

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