i have a chromecast into SSID(vlanA) but need access from SSID(vlanB or C) Need set something into AP7522 or al work about multicast is in the switch. I have switch DELL N3000 series.
Reading some documents, detect that they mention bonjour service. Based on this review, activate the options in the AP and voila! I could see the chromecast from other WIFI. In my case need put some rules into FW for pass http port 8008-8009.
The doc from you have the same but in the last firmware the chromecast parameter is a option.