@gavin wrote:
I can't connect chromecast generation 1 to SSID. SSID is configured for bridge mode. I am unable to connect chromecast generation 1 to my Meraki AP- MR33, running version MR 24.12. any suggestion? 
 
Do I have to enable multicast to fix it? it was not working on my fortinet AP but it started working as soon as I enabled multicast.
Gavin
I have a couple of A/V devices in my test network that have Chromecast built in. It is very convenient to be able to cast from a phone to one or other of them. I have found that it works very well when the SSID the wireless device connects to uses the same VLAN that the Chromecast A/V player ethernet connected devices are members of.
 
So smartphone - VLAN 111
SSID               -  WPA2-PSK, L3-roaming, VLAN tag 111, not isolated, not blocked from LAN
VLAN 111 allowed on WAP and switchport WAP is connected to.
 
The MX does not handle multicast properly (cannot configure IGMP-proxy), so make sure the VLAN connection does not need to be routed via the MZ ; simplest to plug the WAP and the multicast capable device into the same switch and configure IgMPv3 snooping on the switch.
 
I have found out the following from Google - 
You will need to disable AP or client isolation on your router in order to set up Chromecast. -- See What router settings do I need to set up Chromecast?
With that being said,  If you have strong knowledge of firewalls, , you can set things to allow certain traffic.
Which ports does Chromecast use when connecting to external services?
        • HTTP:  TCP/80
	• HTTPS:  TCP/443
	• DNS:  UDP/53
	• SNTP:  UDP/123
Which ports are used by Chromecast to communicate with computer/phone/tablet in the same network?
	• SSDP:  UDP/1900/multicast
	• mDNS:  UDP/5353/multicast
	• TCP/8008
	• TCP/8009
Hope this information helps.Even with this information I am having no joy at getting a smartphone on one VLAN to communicate with a Chromecast device on another VLAN. Cisco has a Chromecast Deployment Guide, Release 7.6 the information therin leads me to believe that Meraki does not yet handle this situation as multicast is not fully functional at this time.
 
I have tried enabling Bonjour which desn't help, I configured the VLANs so that the one of the VLANs super-netted the other and Meraki refused to configure that.
 
With everything on the same VLAN, it works just fine.