Difference Embedded WLC and Mobility Express WLC

[baltej.giri]

I have been studying for CCNA 200-301 certification and noticed Embedded WLC presented as a (physical) server whereas when I tried to dig more information about them on google. I found EWLC is referred to a Catalyst 9100 series APs that acts as EWLC if that is the case then what is mobility express WLC (ME) which is also referred it is embedded on Aironet APs?

What confuses me more are two attached screenshots from the Official CCNA Guide (1st Edition) chapter 27 figure 10 and 11 shows EWLC sitting on the switch seems like a WLC embedded into a catalyst switch?

Anyone here can clear this mud for me?

[Mark Elsen · Accepted solution]

  - @baltej.giri               The picture is confusing ; EWC runs only on an access point, such as mobility express

                                                   The key differences are – EWC is IOS-XE based.
                                     It supports advanced enterprise feature set like SMU, APDP, APSP,
                                     Intelligent Capture which Mobility Express does not support.
                                     EWC has High Availability with active-standby redundancy with less than
                                    10seconds of downtime. EWC also enables customers to use them for Site Surveys

  M.

[Karsten Iwen]

I think it coould be even more difficult than that. Just because Embedded Wireless can also refer to the deployment runningh on a switch like the 9300. This is today only supported for SD-Access, but some time ago I think it was supported for non SD-Access also. If the study guide was developed in that time, they could refer to the WLC part on a switch.

[Mark Elsen]

   - @Karsten Iwen                 Yeah , I know , I was avoiding  SD-Access on the 9300 to not confuse the beginner

   M.

[Karsten Iwen]

For Cisco training material, you always have to think about "what was back then". The official Firewall training is still on version 6.4 ... 😉

[Rich R · Accepted solution]

As Marc and Karsten said EWC was originally supported on standalone 9300 switches but Cisco made that End of Life after IOS-XE 17.3.x after which it was only supported on SDA fabric switches: 
https://www.cisco.com/c/en/us/products/collateral/wireless/catalyst-9800-series-wireless-controllers/guide-c07-744299.html
"As part of mode consolidation Embedded Wireless on Catalyst 9000 Series Switch (non-SDA) using WebUI will be End of Support (Q3FY21) with no additional feature development or code changes and 17.3.x is the last supported release."

The key difference between ME and EWC:
ME was a cut-down version (minimal features) of the AireOS WLC software which runs primarily on the Wave 2 AC APs (1800/2800/3800 series)
EWC is IOS-XE based and supports most of the 9800 series WLC features which runs on the 91xx AX series APs (and originally the 9300 switches).
Both support only AP in flexconnect mode with local switching - no central switching possible as on regular WLC.
Both effectively run the WLC as a second virtual machine on the AP so that it runs the AP and WLC OS software as 2 completely separate processes (the AP itself runs on AP-COS).