Questions about WLC SSID QOS

[Questions]

What is the exact use of bronze, silver, gold, and platium in SSID QOS?

What's different about each one?

Are they involved in speed?

silver SSID Platinum SSID If there is, does it mean that ap will handle the traffic of Platinum SSID first?

[Rasika Nayanajith]

In wireless frames QoS information is carried by UP (user priority) value. It is 3 bit field and value can be 0 -7. By IEEE (802.11e), there are 4 access categories defined for wireless traffic & those 8 UP values maps into each category.

AC_VO (Access Class _ Voice) -> Platinum

AC_VI (Access Class _ Video) -> Gold

AC_BE (Access Class _ Best Effort) -> Silver

AC_BK (Access Class _ Background) -> Bronze

In QoS configurations those alloy metal options to define what is max QoS values allowed in each SSID. If you configured Platinum that means up to UP value 6 traffic allows on your SSID. If you configured your WLAN to Best Effort (Silver) that mean all your wireless traffic QoS value cap to BE or DSCP value 0.

I would suggest watching below ciscolive presentation to get a full understanding of wireless QoS

https://www.ciscolive.com/global/on-demand-library.html?#/session/1542224323210001ruhq 

HTH

Rasika

*** Pls rate all useful responses ***

[patoberli]

Check this document if you also use AVC:
https://www.cisco.com/c/en/us/td/docs/wireless/controller/technotes/8-8/AVC_8point8_dg.html
Very interesting is this part:
AVC and QoS Interaction on the WLAN
The AVC/NBAR2 engine on the controller interoperates with the QoS settings on the specific WLAN. The NBAR2 functionality is based on the DSCP setting. The following occurs to the packets in Upstream and Downstream directions if AVC and QoS are configured on the same WLAN:

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 configuration).

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.