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Vinay Sharma
Level 7
Level 7



Questions about QoS in Wireless

Question 1 

Does this level tag ALL traffic on the WLAN to Platinum if the client does not tag the traffic itself to other values? In other words, is Platinum the default level?

Answer 1

No, Platinum is not the default level.

In the WLANs -> Edit WLAN you can set a QoS profile, from Bronze to Platinum, as shown in the picture.


Question 2

User mentioned that he read that this setting is the maximum level of QoS permitted on the WLAN, in that case he should set it to Platinum if he has VOIP traffic and regular DATA traffic on the same WLAN? For instance Lync/Skype?

Answer 2

Yes, this is max level allowed. User should tag to platinum if you have VOIP clients. Expert do not think skype sends data with priority voice. not sure about lync.

  • Choose Platinum  for wireless VoIP communications with other types of traffic.
  • Choose Gold only for video streaming networks with no voice traffic.
  • Choose Silver for all general purpose data networks with no voice or video traffic.
  • Choose Bronze for all guest networks.

Choose 802.1p from the Protocol Type drop-down list, and enter the appropriate tag in the 802.1p Tag field:

  • Platinum = 5
  • Gold = 4
  • Silver = 3
  • Bronze = 1

Question 3

How does this relate to AVC profiles? User have prioritized certain apps (lync gets DSCP 46) and down-prioritized others (youtube gets DSCP 10), will the values user have to define be tagged with Platinum since he set the WLAN QoS profile to Platinum? Or will they retain their original value as he defined in AVC Profiles.

Answer 3

Wlan setting takes precedence over AVC.

Question 4

Which clients are not WMM compatible? It seems almost all regular computers support WMM.

Answer 4

Yes all modern clients are WMM (Wi-Fi MultiMedia) compatible. you need WMM (Wi-Fi MultiMedia) compatibility for 11n/ 11ac rates

Enable WMM on a WLAN in order to create the simplest implementation of QoS; this option is on the QoS tab in the WLAN configuration menu. Other WMM policy settings are:

  • Disabled - WMM is not in use on the WLAN.
  • Required - Clients must support WMM or they are not permitted to access the WLAN.
  • Allowed - Clients that support WMM may use it, while those that do not support WMM can still connect to the network. 

WMM is a Wi-Fi alliance certification, which is a subset of the full 802.11e IEEE standard.

Question 5

Can someone confirm the following QoS is true for the wired infrastructure: WLC ports are mls qos trust cos and AP ports are mls qos trust dscp. But what about trunks between switches and the uplink to your ISP? trust dscp?

Answer 5

Trunks are usually trust cos and access ports are usually trust dscp. you need to make sure end to end qos is configured properly.

QoS Overview

QoS refers to the capability of a network to provide differentiated service to selected network traffic over various network technologies. QoS technologies provide the following benefits:

  • Provide building blocks for business multimedia and voice applications used in campus, WAN, and service provider networks
  • Allow network managers to establish service-level agreements (SLAs) with network users
  • Enable network resources to be shared more efficiently and expedite the handling of mission-critical applications
  • Manage time-sensitive multimedia and voice application traffic to ensure that this traffic receives higher priority, greater bandwidth, and less delay than best-effort data traffic

With QoS, bandwidth can be managed more efficiently across LANs, including WLANs and WANs. QoS provides enhanced and reliable network service by doing the following:

  • Supporting dedicated bandwidth for critical users and applications
  • Controlling jitter and latency (required by real-time traffic)
  • Managing and minimizing network congestion
  • Shaping network traffic to smooth the traffic flow
  • Setting network traffic priorities


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