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New Member

WMM Issue

Hi,

I have deployed a couple of 1600 Series access points and a Cisco 2504 WLC. The issue I have it's that the speed on downlink (AP to STA) it's half the speed in the uplink direction (STA to AP). If I turn the WMM off (of course I lose 802.11n capability) the speed it's almost the same in both directions. I know what WMM does and how it's supposed to work, but I don't think this behaviour it's normal. The QoS profile it's set to Platinum (voice), but the results are the same no matter what profile I chose. Any thoughts on this ?

33 REPLIES

Re: WMM Issue

The speed a client connects at is based around the RSSI and SNR. So it is entirely possible that the AP and client would have different rates each direction. QoS wouldn't necessarily have an effect on the actual data transfer rates, just how the traffic gets queued. Further of the client/application isn't marking traffic with an appropriate dscp the QoS on the WLAN becomes moot.

What youngest to look at is the signal strength and quality on the client as well as the AP/WLC which will help you determine what sustainable rate they can each use to pass traffic.

Steve

Sent from Cisco Technical Support iPhone App

HTH, Steve ------------------------------------------------------------------------------------------------ Please remember to rate useful posts, and mark questions as answered
New Member

Re: WMM Issue

I forgot to mention that the test was done with an Intel AGN5100 wireless card (but this issue affects all clients) and the SNR was perfect (look below for further evidence).

      Radio Signal Strength Indicator............ -48 dBm

      Signal to Noise Ratio...................... 47 dB

Also on the client side the software reported that the link speed is 300 Mbps and on the controller the coding scheme was m15.

Here is the detailed picture regarding other parameters:

AP radio slot Id................................. 1

Client State..................................... Associated

Client NAC OOB State............................. Access

Wireless LAN Id.................................. 1

Hotspot (802.11u)................................ Not Supported

BSSID............................................ 7c:95:f3:6c:c6:3f

Connected For ................................... 371 secs

Channel.......................................... 36

Association Id................................... 1

Authentication Algorithm......................... Open System

Reason Code...................................... 1

Status Code...................................... 0

Client CCX version............................... 4

Client E2E version............................... 1

Re-Authentication Timeout........................ 16420

QoS Level........................................ Platinum

Avg data Rate.................................... 0

Burst data Rate.................................. 0

Avg Real time data Rate.......................... 0

Burst Real Time data Rate........................ 0

802.1P Priority Tag.............................. disabled

CTS Security Group Tag........................... Not Applicable

KTS CAC Capability............................... No

WMM Support...................................... Enabled

  APSD ACs.......................................  BK  BE  VI  VO

Power Save....................................... OFF

Current Rate..................................... m15

Supported Rates.................................. 6.0,9.0,12.0,18.0,24.0,36.0,

    ............................................. 48.0,54.0

Mobility State................................... Local

Mobility Move Count.............................. 0

Security Policy Completed........................ Yes

Policy Manager State............................. RUN

Policy Manager Rule Created...................... Yes

Audit Session ID................................. 0aac1f0400001c855267f15a

AAA Role Type.................................... none

Local Policy Applied............................. none

IPv4 ACL Name.................................... none

IPv4 ACL Applied Status.......................... Unavailable

IPv6 ACL Name.................................... none

IPv6 ACL Applied Status.......................... Unavailable

Layer2 ACL Name.................................. none

Layer2 ACL Applied Status........................ Unavailable

mDNS Status...................................... Enabled

mDNS Profile Name................................ default-mdns-profile

No. of mDNS Services Advertised.................. 0

Policy Type...................................... WPA2

Authentication Key Management.................... 802.1x

Encryption Cipher................................ CCMP (AES)

Protected Management Frame ...................... No

Management Frame Protection...................... No

EAP Type......................................... 0

Client Capabilities:

      CF Pollable................................ Not implemented

      CF Poll Request............................ Not implemented

      Short Preamble............................. Not implemented

      PBCC....................................... Not implemented

      Channel Agility............................ Not implemented

      Listen Interval............................ 60

      Fast BSS Transition........................ Not implemented

Client Wifi Direct Capabilities:

      WFD capable................................ No

      Manged WFD capable......................... No

      Cross Connection Capable................... No

      Support Concurrent Operation............... No

Fast BSS Transition Details:

Client Statistics:

      Number of Bytes Received................... 308560537

      Number of Bytes Sent....................... 163416022

      Number of Packets Received................. 273317

      Number of Packets Sent..................... 217337

      Number of Interim-Update Sent.............. 0

      Number of EAP Id Request Msg Timeouts...... 0

      Number of EAP Id Request Msg Failures...... 0

      Number of EAP Request Msg Timeouts......... 0

      Number of EAP Request Msg Failures......... 0

      Number of EAP Key Msg Timeouts............. 0

      Number of EAP Key Msg Failures............. 0

      Number of Data Retries..................... 14412

      Number of RTS Retries...................... 0

      Number of Duplicate Received Packets....... 0

      Number of Decrypt Failed Packets........... 0

      Number of Mic Failured Packets............. 0

      Number of Mic Missing Packets.............. 0

      Number of RA Packets Dropped............... 0

      Number of Policy Errors.................... 0

      Radio Signal Strength Indicator............ -48 dBm

      Signal to Noise Ratio...................... 47 dB

Client Rate Limiting Statistics:

      Number of Data Packets Recieved............ 0

      Number of Data Rx Packets Dropped.......... 0

      Number of Data Bytes Recieved.............. 0

      Number of Data Rx Bytes Dropped............ 0

      Number of Realtime Packets Recieved........ 0

      Number of Realtime Rx Packets Dropped...... 0

      Number of Realtime Bytes Recieved.......... 0

      Number of Realtime Rx Bytes Dropped........ 0

      Number of Data Packets Sent................ 0

      Number of Data Tx Packets Dropped.......... 0

      Number of Data Bytes Sent.................. 0

      Number of Data Tx Bytes Dropped............ 0

      Number of Realtime Packets Sent............ 0

      Number of Realtime Tx Packets Dropped...... 0

      Number of Realtime Bytes Sent.............. 0

      Number of Realtime Tx Bytes Dropped........ 0

PS: The speed using the above configuration is 32 Mbps on downlink and 80 Mbps on uplink (more than double). Another important thing that worth mentioning it's that without the controller (an AP in standalone mode) I don't have this problem.

Re: WMM Issue

what driver are you running?  i have seen issue with driver in CUWN vs aIOS deployments

HTH,
Steve

------------------------------------------------------------------------------------------------
Please remember to rate useful posts, and mark questions as answered

HTH, Steve ------------------------------------------------------------------------------------------------ Please remember to rate useful posts, and mark questions as answered
New Member

WMM Issue

As I told you this issue affects all clients (no matter what wireless card or OS). This problem is present only on clients that connects via 802.11n, on a/g everything it's normal. The driver version it's 14.3.2.1 but I have another laptop with Intel Centrino Advanced N 6235 (driver 15.10.3.2) with exactly the same problem.

Hall of Fame Super Silver

Re: WMM Issue

How are you testing? I would also use jperf to test and not use any online speed test. Jperf is free and is what I use to test throughput. There is a known issue with the 5ghz and the v14 of the driver but is fixed in v15.

Sent from Cisco Technical Support iPhone App

-Scott
*** Please rate helpful posts ***
Hall of Fame Super Silver

Re: WMM Issue

Post your

show WLAN
show interface summary

Sent from Cisco Technical Support iPhone App

-Scott
*** Please rate helpful posts ***
New Member

Re: WMM Issue

show wlan 1

WLAN Identifier.................................. 1

Profile Name..................................... Test

Network Name (SSID).............................. Test

Status........................................... Enabled

MAC Filtering.................................... Disabled

Broadcast SSID................................... Enabled

AAA Policy Override.............................. Enabled

Network Admission Control

Client Profiling Status

    Radius Profiling ............................ Disabled

     DHCP ....................................... Disabled

     HTTP ....................................... Disabled

    Local Profiling ............................. Disabled

     DHCP ....................................... Disabled

     HTTP ....................................... Disabled

  Radius-NAC State............................... Disabled

  SNMP-NAC State................................. Disabled

  Quarantine VLAN................................ 0

Maximum number of Associated Clients............. 0

Maximum number of Clients per AP Radio........... 200

Number of Active Clients......................... 10

Exclusionlist Timeout............................ 60 seconds

Session Timeout.................................. 28800 seconds

User Idle Timeout................................ 60 seconds

Sleep Client..................................... disable

Sleep Client Timeout............................. 12 hours

User Idle Threshold.............................. 0 Bytes

NAS-identifier................................... WLC_Int

CHD per WLAN..................................... Enabled

Webauth DHCP exclusion........................... Disabled

Interface........................................ management

Multicast Interface.............................. Not Configured

WLAN IPv4 ACL.................................... unconfigured

WLAN IPv6 ACL.................................... unconfigured

WLAN Layer2 ACL.................................. unconfigured

mDNS Status...................................... Enabled

mDNS Profile Name................................ default-mdns-profile

DHCP Server...................................... Default

DHCP Address Assignment Required................. Enabled

Static IP client tunneling....................... Disabled

Quality of Service............................... Platinum

Per-SSID Rate Limits............................. Upstream      Downstream

Average Data Rate................................   0             0

Average Realtime Data Rate.......................   0             0

Burst Data Rate..................................   0             0

Burst Realtime Data Rate.........................   0             0

Per-Client Rate Limits........................... Upstream      Downstream

Average Data Rate................................   0             0

Average Realtime Data Rate.......................   0             0

Burst Data Rate..................................   0             0

Burst Realtime Data Rate.........................   0             0

Scan Defer Priority.............................. 4,5,6

Scan Defer Time.................................. 100 milliseconds

WMM.............................................. Allowed

WMM UAPSD Compliant Client Support............... Disabled

Media Stream Multicast-direct.................... Disabled

CCX - AironetIe Support.......................... Enabled

CCX - Gratuitous ProbeResponse (GPR)............. Disabled

CCX - Diagnostics Channel Capability............. Disabled

Dot11-Phone Mode (7920).......................... Disabled

Wired Protocol................................... None

Passive Client Feature........................... Disabled

Peer-to-Peer Blocking Action..................... Disabled

Radio Policy..................................... All

DTIM period for 802.11a radio.................... 3

DTIM period for 802.11b radio.................... 3

Radius Servers

   Authentication................................ x.x.x.x 1812

   Authentication................................ x.x.x.x 1812

   Accounting.................................... Disabled

   Dynamic Interface............................. Disabled

   Dynamic Interface Priority.................... wlan

Local EAP Authentication......................... Disabled

Security

   802.11 Authentication:........................ Open System

   FT Support.................................... Disabled

   Static WEP Keys............................... Disabled

   802.1X........................................ Disabled

   Wi-Fi Protected Access (WPA/WPA2)............. Enabled

      WPA (SSN IE)............................... Enabled

         TKIP Cipher............................. Disabled

         AES Cipher.............................. Enabled

      WPA2 (RSN IE).............................. Enabled

         TKIP Cipher............................. Disabled

         AES Cipher.............................. Enabled

                                                               Auth Key Management

         802.1x.................................. Enabled

         PSK..................................... Disabled

         CCKM.................................... Disabled

         FT-1X(802.11r).......................... Disabled

         FT-PSK(802.11r)......................... Disabled

         PMF-1X(802.11w)......................... Disabled

         PMF-PSK(802.11w)........................ Disabled

      FT Reassociation Timeout................... 20

      FT Over-The-DS mode........................ Enabled

      GTK Randomization.......................... Disabled

      SKC Cache Support.......................... Disabled

      CCKM TSF Tolerance......................... 1000

   WAPI.......................................... Disabled

   Wi-Fi Direct policy configured................ Disabled

   EAP-Passthrough............................... Disabled

   CKIP ......................................... Disabled

   Web Based Authentication...................... Disabled

   Web-Passthrough............................... Disabled

   Conditional Web Redirect...................... Disabled

   Splash-Page Web Redirect...................... Disabled

   Auto Anchor................................... Disabled

   FlexConnect Local Switching................... Disabled

   flexconnect Central Dhcp Flag................. Disabled

   flexconnect nat-pat Flag...................... Disabled

   flexconnect Dns Override Flag................. Disabled

   flexconnect PPPoE pass-through................ Disabled

   flexconnect local-switching IP-source-guar.... Disabled

   FlexConnect Vlan based Central Switching ..... Disabled

   FlexConnect Local Authentication.............. Disabled

   FlexConnect Learn IP Address.................. Enabled

   Client MFP.................................... Disabled

   PMF........................................... Disabled

   PMF Association Comeback Time................. 1

   PMF SA Query RetryTimeout..................... 200

   Tkip MIC Countermeasure Hold-down Timer....... 60

AVC Visibilty.................................... Disabled

AVC Profile Name................................. None

Flow Monitor Name................................ None

Split Tunnel (Printers).......................... Disabled

Call Snooping.................................... Disabled

Roamed Call Re-Anchor Policy..................... Disabled

SIP CAC Fail Send-486-Busy Policy................ Enabled

SIP CAC Fail Send Dis-Association Policy......... Disabled

KTS based CAC Policy............................. Disabled

Assisted Roaming Prediction Optimization......... Disabled

802.11k Neighbor List............................ Disabled

802.11k Neighbor List Dual Band.................. Disabled

Band Select...................................... Enabled

Load Balancing................................... Disabled

Multicast Buffer................................. Disabled

Mobility Anchor List

WLAN ID     IP Address            Status

-------     ---------------       ------

802.11u........................................ Disabled

MSAP Services.................................. Disabled

Local Policy

----------------

Priority  Policy Name

--------  ---------------

show interface summary

Number of Interfaces.......................... 5

Interface Name                   Port Vlan Id  IP Address      Type    Ap Mgr Guest

-------------------------------- ---- -------- --------------- ------- ------ -----

management                       1    200      10.1.31.4         Static       Yes    No

vlan_1                                 1    150      10.1.14.4      Dynamic      No     No

vlan_2                                 1    151      10.1.8.4        Dynamic      No     No

vlan_3                                 1    152      10.1.29.4      Dynamic      No     No

virtual                                N/A  N/A      10.0.0.1          Static        No     No

Hall of Fame Super Silver

Re: WMM Issue

What I would do is delete that WLAN and create it again leaving the defaults settings except for the broadcast enabled or disabled, the interface and use WPA2/AES only. Don't use WPA/TKIP with WPA or don't mix and match.

Sent from Cisco Technical Support iPhone App

-Scott
*** Please rate helpful posts ***
New Member

WMM Issue

I created another SSID with no authentication and no encryption. It seems that the speed has increase by 10-15 Mbps on downlink, so now I get 50 Mbps/70 Mbps downlink/uplink speed.

Re: WMM Issue

I know you mentioned, you know what WMM is and since you do are you marking your packets at the application layer ? Cuase if you aren't what are you gaining from WMM ?



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__________________________________________________________________________________________ "Satisfaction does not come from knowing the solution, it comes from knowing why." - Rosalind Franklin ___________________________________________________________
New Member

Re: WMM Issue

Packets are not marked, so the DSCP marking is 0x00. Anyway I dont't see the problem because WMM should work in both direction, so I should also get low throughput in uplink direction. Standalone APs are also using WMM and with them I don't have any problems.

Later Edit: I looked at traffic and I noticed that everything that it's comming from the controller it's marked DSCP 0x18 (CS3) and I presume that the marking it's done by the controller, probably because of the QoS Profile set (Platinium).

Hall of Fame Super Silver

Re: WMM Issue

The main thing is to get the WLAN configuration correct. You had many non default settings that I wouldn't of used and the biggest thing was that you had both WPA and WPA2 enabled, which causes issue with Apple devices.

QoS markings depends on what you have set for that WLAN and what you have set for your QoS policies. That really isn't going to slow down or increase your uploads or downloads unless your over utilizing the network and QoS needs to happen.

Sent from Cisco Technical Support iPhone App

-Scott
*** Please rate helpful posts ***
New Member

Re: WMM Issue

I reset everything to default and I created another SSID on which I configured only the authentication + encryption (WPA2 + AES) and everything it's exactly the same (30-35 Mbps on downlink and 75-80 Mbps on uplink).

@Abhishek Could you be more explicit ?; what QOS class map ?. The current Qos profile on controller is Silver (best effort).

Re: WMM Issue

There may be an issue of the traffic being matched bu the QOS class map

New Member

Re: WMM Issue

A related problem might be that I also have packet loss (at random times) and high latency for no obvious reason. For instance now no client (except for me it's associated to the wi-fi network) and no other acces point it's in the same channel as this one, but as you can see one packet was lost.

Reply from 10.1.31.1: bytes=32 time=3ms TTL=255

Reply from 10.1.31.1: bytes=32 time=3ms TTL=255

Reply from 10.1.31.1: bytes=32 time=3ms TTL=255

Reply from 10.1.31.1: bytes=32 time=3ms TTL=255

Reply from 10.1.31.1: bytes=32 time=3ms TTL=255

Request timed out.

Reply from 10.1.31.1: bytes=32 time=6ms TTL=255

Reply from 10.1.31.1: bytes=32 time=3ms TTL=255

Reply from 10.1.31.1: bytes=32 time=3ms TTL=255

Reply from 10.1.31.1: bytes=32 time=3ms TTL=255

Reply from 10.1.31.1: bytes=32 time=8ms TTL=255

Reply from 10.1.31.1: bytes=32 time=72ms TTL=255

Reply from 10.1.31.1: bytes=32 time=3ms TTL=255

Reply from 10.1.31.1: bytes=32 time=5ms TTL=255

Reply from 10.1.31.1: bytes=32 time=6ms TTL=255

Reply from 10.1.31.1: bytes=32 time=7ms TTL=255

Reply from 10.1.31.1: bytes=32 time=7ms TTL=255

Reply from 10.1.31.1: bytes=32 time=3ms TTL=255

Reply from 10.1.31.1: bytes=32 time=3ms TTL=255

Reply from 10.1.31.1: bytes=32 time=3ms TTL=255

Reply from 10.1.31.1: bytes=32 time=2ms TTL=255

Reply from 10.1.31.1: bytes=32 time=3ms TTL=255

Reply from 10.1.31.1: bytes=32 time=6ms TTL=255

Reply from 10.1.31.1: bytes=32 time=136ms TTL=255

PS: The problem can't be on the wire side, where the link latency (from WLC to AP) reported by the controller it's < 1ms. 

New Member

WMM Issue

Anyone ? I'm absolutely clueless about what's happening. With WMM disable the downlink/uplink speed it's spot on (as it should be): 22 Mbps on downlink and 22 on uplink. Enable WMM and it's chaos, 30 Mbps on downlink and 80-85 Mbps on uplink.

Hall of Fame Super Silver

WMM Issue

Isolate the issue... force the client on the 2.4ghz and test, then force the client on the 5ghz using only 20mhz channel width and test, then force the client on the 5ghz with 40mhz and test.  See which one works and which one give you issues.  I ran into this with Intel cards which doesn't like 40mhz, so I disable 40mhz.

Thanks,

Scott

Help out other by using the rating system and marking answered questions as "Answered"

-Scott
*** Please rate helpful posts ***
New Member

WMM Issue

The problem is the same no matter what band I chose, on 2.4 Ghz I get 20 Mbps/40 Mbps and on 5 Ghz with 20 Mhz channel I get 26 Mbps/42 Mbps, which it's rather fascinating because it's exactly half.

Hall of Fame Super Silver

WMM Issue

What you need to also test is a continuos ping.  I have seen clients devices loose ping's due to 40mhz channel width.  Don't just test throughput, because if the client isn't stable using 5ghz or 40mhz channel width, your issue is with the client.  Are you using jperf?

Thanks,

Scott

Help out other by using the rating system and marking answered questions as "Answered"

-Scott
*** Please rate helpful posts ***
New Member

Re: WMM Issue

I told you earlier that for no reason and at random times my latency increases so I've capture some traffic right at the radio interface level and I disovered a rather worrying problem. Right at the point where latency increases from 3 to 150 ms one beacon frame it's missing. It is possilbe that the beacon collided with a frame sent by the STA? Or is this a bug ? 

Hall of Fame Super Silver

WMM Issue

What are you using to test throughput?

Thanks,

Scott

Help out other by using the rating system and marking answered questions as "Answered"

-Scott
*** Please rate helpful posts ***
New Member

Re: WMM Issue

I download/upload a file from/to a FTP server connected in the same switch as the controller. Using the copper cable instead of wireless the speed goes close to 100/100 Mbps so I don't see any problem in the way I measure the speed.

Hall of Fame Super Silver

Re: WMM Issue

Well I tested with iperf and I get around 25-35 up and down. I'm using a 3602 and 802.1x. AP is also connected at 1000 Full Duplex.

Sent from Cisco Technical Support iPhone App

-Scott
*** Please rate helpful posts ***
New Member

Re: WMM Issue

If you ask me that's not much if you are connected on 5 GHz (40 Mhz channel).

Hall of Fame Super Silver

Re: WMM Issue

I was testing between wireless clients an iphone and iPad and iPhone to a wired PC running iperf. I really don't expect to have great throughput when transferring large files and many of my customers who do these or require large file transfers will use the wired side. In a greenfield test environment you can achieve negotiation that states 300mbps that means max with one client you might see 150mbps. Now how many clients on that channel, you would divide 150mbps and that will get you what you should theoretically see, in actuality I have never tested throughput that high. Wired is full duplex and wireless is half duplex so it's like a hub.... Everything is shared amount all devices on that channel.

Sent from Cisco Technical Support iPhone App

-Scott
*** Please rate helpful posts ***
New Member

Re: WMM Issue

I must say that I'm a bit dissapointed by the performance of the Cisco WLC. I tested other vendor equipments (not so expensive) and I managed to get 170 Mbps of throughput using UDP in a normal environment (not ideal). Even with Cisco Autonomous APs I get 100+ Mbps of throughput with TCP. Yeah the centralized management it's beautiful, but the performance numbers in terms of speed just don't impress me. I hope that there is a way to fix my imbalanced throughput and I will look forward to find the issue ...

LE: And I forgot to mention the power problem which affects the 1600 series APs in the 2.4 Ghz, which instead of transmitting with 22 dbm, transmits with 12-13 dbm, which messed up all my WI-FI provisioning that I did before.

Hall of Fame Super Gold

WMM Issue

Console into the AP and post the output to the command "sh interface G0".  On your switch, post the "sh interface " on the port that connnects to the AP and the WLC.

New Member

Re: WMM Issue

Switch to WLC:

      switchport trunk encapsulation dot1q

      switchport mode trunk

      load-interval 30

      mls qos trust dscp

Switch to AP:

     switchport access vlan 200

     switchport mode access

     load-interval 30

     mls qos trust dscp

Hall of Fame Super Gold

WMM Issue

Switch to WLC:

switchport trunk encapsulation dot1q

switchport mode trunk

load-interval 30

mls qos trust dscp

Switch to AP:

switchport access vlan 200

switchport mode access

load-interval 30

mls qos trust dscp

Adrian,

These are NOT the output I am requesting.

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