Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

(AVC) Is there Any way to prioritize traffic from wireless client (laptop in my case) to AP

Is there any way to prioritize traffic from wireless client (laptop in my case) to AP …. if i explain the issue in a broad way there is no congestion going on in wired network. When multiple users connect to real presence and all share the same AP. they get real-time output over the call BUT if someone start file-transfer over the same AP the real presence call voice/video get stuck.

I applied the AVC feature on WLC but as i tested, i think prioritization from my laptop to AP will not happen and the situation remains same.

Please share if there is any way to prioritize traffic from wireless client (Laptop) to AP only ?

26 REPLIES
Hall of Fame Super Gold

(AVC) Is there Any way to prioritize traffic from wireless clien

When multiple users connect to real presence and all share the same AP. they get real-time output over the call BUT if someone start file-transfer over the same AP the real presence call voice/video get stuck.

AVC is not used for "prioritization" of traffic.  AVC is like a "filter".  AVC identified the type of traffic and administrator have the option to allow or deny the traffic.

If you want to prioritize voice/video traffic above anything else then you need to configure QoS properly on the WLC.

New Member

(AVC) Is there Any way to prioritize traffic from wireless clien

Hi Leo,

i agree .. but my question is still moving around ...

1. If we are setting marking level under AVC profile then higher marking should take priority it means somewhere voice/video traffic which is being marked by DSCP 46 should take precedence and in this way voice/video should not be stuck while congetion... isn't it ?

2. Let's say its not prioritized even though the file-transfer should be denied as per last entry in AVC profile ..

Have a look in below configuration ...

Hope it would make more clear my query.......

Hall of Fame Super Gold

Re: (AVC) Is there Any way to prioritize traffic from wireless c

Vinod,

Ok, my first post went down wrong.  So let me spell this out for you ...

You want to prioritize SPECIFIC data traffic?  Stop looking at the WLC because the WLC will NOT BE ABLE to do what you are tying to do.  You are "barking up the wrong tree". 

If you want to prioritize specific data traffic you must do so on your ROUTER. 

Hall of Fame Super Gold

Re: (AVC) Is there Any way to prioritize traffic from wireless c

When multiple users connect to real presence and all share the same AP. they get real-time output over the call BUT if someone start file-transfer over the same AP the real presence call voice/video get stuck.

A few things to consider:

1.  What is the model of your AP?

2.  What speed and duplex is the AP in question negotiating to the wired network?

3.  HOW MANY wireless clients attached to the AP before people start seeing issues?

New Member

Re: (AVC) Is there Any way to prioritize traffic from wireless c

Hi Leo,

1. AIR-LAP1042N-N-K9

2. 100Mbps Full-Duplex

3. 7-10 users

Regards :

Vinod :-)


Hall of Fame Super Gold

Re: (AVC) Is there Any way to prioritize traffic from wireless c

100 Mbps and full duplex???

The behaviour of your wireless when you hit the "peak" of 7 to 10 users is NORMAL. Have you tried sticking the AP to a GigabitEthernet port and observing?

I mean 100 Mbps is the BOTTLENECK.

Sent from Cisco Technical Support Nintendo App

New Member

Re: (AVC) Is there Any way to prioritize traffic from wireless c

During the peak even Rx and Tx load on AP connected interface doesn't go beyond txload 20/255, rxload 25/255

I don't think there is any bottleneck .. also checked on WLC connected interface and the same thing i got.....

Hall of Fame Super Gold

Re: (AVC) Is there Any way to prioritize traffic from wireless c

Vinod,

Prove me wrong then. Connect the AP to a GigabitEthernet port and prove me wrong.

Sent from Cisco Technical Support Nintendo App

New Member

Re: (AVC) Is there Any way to prioritize traffic from wireless c

Hi Leo,

Lets say 5 users are using video conf out of 7 even though 1.5Mbps x 5 users = 7.5Mbps b/w required ..

and thats what i see proportional Tx and Rx load on interface so i don't think that would make any improvement ...

Anyway very soon i would change it to Gig and check if this helps ...

Please explain why you are so confident to go for Gig connection ? have you seen same issue earlier somewhere ?

Regards :

Vinod :-)

Hall of Fame Super Gold

Re: (AVC) Is there Any way to prioritize traffic from wireless c

Vinod,

If I don't know my wireless, I would say I agree with your explanation. Unfortunately, you missed one vital information about the difference between wireless and wired network.

Wireless transmission is like a HUB. When one wireless clients talk, for example, all the rest must WAIT and listen for their turn. If you have seven wireless clients doing video streaming, everyone else have to stop transmission, wait and listen for their turn. And the time for their turn can be longer because of the iinherit continuous video traffic.

Now, add to the mix the fact that you are doing continuous traffic to a FastEthernet speed on video. Now normally, I would say this kind of interface speed is OK when you are doing, for example, web browsing and/or email. But video traffic? I don't care what explanation you've got. It just won't wash.

And just to re-inforce what I'm talking about, I'm not just a wireless guy. I do LAN/WAN and do a little bit of voice too.

Sent from Cisco Technical Support Nintendo App

Hall of Fame Super Gold

Re: (AVC) Is there Any way to prioritize traffic from wireless c

Forgot another thing: The AP you're currently using, 1040, is the SLOWEST of the 802.11n models. 1040 is only 2 x 2 MIMO. Even the older 1140 is slightly better with 2 x 3 MIMO.

Sent from Cisco Technical Support Nintendo App

(AVC) Is there Any way to prioritize traffic from wireless clien

Adding to Leo,

          You also need to configure the software on the laptop to send the appropriate QoS values.  If the device doesn't send the correct mark on the packets there isn't anything that can be done until it hits the WLC and the AVC profile remarks the packet, or you run it through a policy-map on the switch side.

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

Re: (AVC) Is there Any way to prioritize traffic from wireless c

AVC wont deny that traffic, unless you use DROP and that drop is specific for that application not all file sharing. What is microsoftds exactly ?

Again, like Leo and Steve mentioned. The WLC uses NBAR and ID's an application and says "hey your are voice app XYZ and I need to change your markings". This is good for clients that don't mark, like laptops (Steve is on target). know that the marking happens at the WLC and not the AP.

__________________________________________________________________________________________
"Satisfaction does not come from knowing the solution, it comes from knowing why." - Rosalind Franklin
__________________________________________________________________________________________
‎"I'm in a serious relationship with my Wi-Fi. You could say we have a connection."

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

(AVC) Is there Any way to prioritize traffic from wireless clien

Microsoft-DS is layer4 protocol uses TCP port 445 and being used by microsoft operating system when we copy files.

I can see this protocol in capture when i do file copy so as per AVC profile setting related traffic should be dropped ... but it's not.

i don't know where i am missing ?

Regards :

Vinod :-)

Re: (AVC) Is there Any way to prioritize traffic from wireless c

Do a wireshark when this is transfer is happening. Make sure it looks like this Mircosoft-DS.

__________________________________________________________________________________________
"Satisfaction does not come from knowing the solution, it comes from knowing why." - Rosalind Franklin
__________________________________________________________________________________________
‎"I'm in a serious relationship with my Wi-Fi. You could say we have a connection."

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

(AVC) Is there Any way to prioritize traffic from wireless clien

Sure .. here is capture

so this should drop traffic ..right ?

Regards :

Vinod :-)

(AVC) Is there Any way to prioritize traffic from wireless clien

Where did you sniff this before the WLC or after the WLC? Yes, i would think it would drop the traffic ..

__________________________________________________________________________________________
"Satisfaction does not come from knowing the solution, it comes from knowing why." - Rosalind Franklin
__________________________________________________________________________________________
‎"I'm in a serious relationship with my Wi-Fi. You could say we have a connection."

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

Re: (AVC) Is there Any way to prioritize traffic from wireless c

Hi Jeorge,

Given captured snap had been taken from Laptop which is acting as wireless client .. i mean the same Laptop initiating traffic and sending to AP while doing so i captured the traffic on same.

Regards :

Vinod :-)

VIP Purple

Re: (AVC) Is there Any way to prioritize traffic from wireless c

Hi Vinod,

Provide your WLC "show sysinfo" output to check few things on your WLC

Rasika

New Member

Re: (AVC) Is there Any way to prioritize traffic from wireless c

(Cisco Controller) >show sysinfo

Manufacturer's Name.............................. Cisco Systems Inc.

Product Name..................................... Cisco Controller

Product Version.................................. 7.4.100.60

Bootloader Version............................... 1.0.18

Field Recovery Image Version..................... 7.4.1.30

Firmware Version................................. PIC 15.0

Build Type....................................... DATA + WPS

System Name...................................... Confidential

System Location..................................

System Contact...................................

System ObjectID.................................. 1.3.6.1.4.1.9.1.1279

IP Address....................................... Confidential

Last Reset....................................... Software reset

System Up Time................................... 2 days 11 hrs 29 mins 2 secs

System Timezone Location.........................Confidential

System Stats Realtime Interval................... 5

System Stats Normal Interval..................... 180

--More-- or (q)uit

Configured Country............................... IN  - India

Operating Environment............................ Commercial (0 to 40 C)

Internal Temp Alarm Limits....................... 0 to 65 C

Internal Temperature............................. +30 C

External Temperature............................. +34 C

Fan Status....................................... 3608 rpm

State of 802.11b Network......................... Enabled

State of 802.11a Network......................... Enabled

Number of WLANs.................................. 5

Number of Active Clients......................... 143

Memory Current Usage............................. Unknown

Memory Average Usage............................. Unknown

CPU Current Usage................................ Unknown

CPU Average Usage................................ Unknown

Burned-in MAC Address............................ D0:C2:82:E0:47:40

Maximum number of APs supported.................. 25

VIP Purple

Re: (AVC) Is there Any way to prioritize traffic from wireless c

Hi Vinod,

I wanted to check the FUS version of your controller to make sure it has the correct firmware to support AVC on 2500.

http://www.cisco.com/en/US/docs/wireless/controller/release/notes/fus_1_8_0_0.html

If you are using a Cisco 2500 Series Controller and you upgrade to the 7.4.100.0 controller software release and intend to use the Application Visibility and Control (AVC) and NetFlow protocol features, you must install Cisco Unified Wireless Network Field Upgrade Software, Release 1.8.0.0. This release is not required if you are using other controller hardware models.

It seems you have correct firmware with that respect based on your WLC bootloader version.

Bootloader Version............................... 1.0.18

Though it is not to AVC related the recommended/stable code in 7.4.x train is 7.4.121.0 (7.4MR2). This is the code you want to be if you are planning to stay in 7.4.x for long.

http://www.cisco.com/en/US/docs/wireless/controller/release/notes/crn74mr02.html

I would suggest to upgrade to that code & check this again. If you are 100% certain microsoft-ds is not getting block by AVC rule, I would suggest to open a TAC case & get their view

HTH

Rasika

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

New Member

(AVC) Is there Any way to prioritize traffic from wireless clien

Just wanted to know is there any welknown tool which can mark traffic as per defined rule on the PC ?

Regards :

Vinod :-)

Hall of Fame Super Gold

Re: (AVC) Is there Any way to prioritize traffic from wireless c

Steve, Rasi, George, Scott and Vinod.


We are looking at this in the wrong angle.  If Vinod want to limit MSDS traffic then he's looking at this in the wrong direction.

The best/ideal or strategic place to QoS your MSDS traffic is in the router or Layer 3 switch where the default gateway is located.

AVC will only see what traffic you've got and either DROP the packet or put it into a counter (and let it through).

VIP Purple

(AVC) Is there Any way to prioritize traffic from wireless clien

Hi Leo,

I think Vinod objective is not block MSDS across the board. Here is what I interpret

"Since he noticed Polycom Raal Presence video call get freeze when a wireless user use MSDS fileshare, he would like to block it for wireless user using AVC & see if that help to improve video over wireless. But he cannot block this application for wireless using AVC"

Vinod: Pls clarify as you are best person to clarify your requirement

Rasika

Hall of Fame Super Gold

(AVC) Is there Any way to prioritize traffic from wireless clien

Hi Rasika,

I am not suggesting he block MSDS.  I am merely suggesting if he wants to effectively configure QoS to SLOW DOWN MSDS then the WLC is not the ideal place.

VIP Purple

Re: (AVC) Is there Any way to prioritize traffic from wireless c

Hi Vinod,

Here is the AVC & QoS interaction for upstream & downstream traffic. For downstream it is important you have configured your WLAN with correct QoS profile & 802.1p values as that play a role even though you marking traffic using AVC.

Upstream

1. Packet comes with or without inner DSCP from wireless side (wireless client).

2. AP will add DSCP in the CAPWAP header that is configured on WLAN (QoS based config).

3. WLC will remove CAPWAP header.

4. AVC module on the controller will overwrite the DSCP to the configured marked value in the AVC profile and send it out.

Downstream

1. Packet comes from switch with or without inner DSCP wired side value.

2. AVC module will overwrite the inner DSCP value.

3. Controller will compare WLAN QoS configuration (as per 802.1p value that is actually 802.11e) with inner DSCP value that NBAR had overwritten. WLC will choose the lesser value and put it into CAPWAP header for DSCP.

4. WLC will send out the packet to AP with QoS WLAN setting on the outer CAPWAP and AVC inner DSCP setting.

5. AP strips the CAPWAP header and sends the packet on air with AVC DSCP setting; if AVC was not applied to an application then that application will adopt the QoS setting of the WLAN.

I am not sure which controller software version you are running. From AVC perspective, it is good if you could install latest NBAR protocol pack (4.1 for WLC 7.5.x code or 6.3 for WLC 7.6.x code) on your controller.

Here is the 7.5.x AVC deployment guide which should help you on this

http://www.cisco.com/en/US/docs/wireless/controller/technotes/7.5/AVC_dg7point5.html

Like others mentioned, it is very little you can do with respect to upstream direction as AVC kicks in only when traffic hits WLC & not at the AP level.

HTH

Rasika

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

1773
Views
18
Helpful
26
Replies
CreatePlease to create content