Chromecast across VLANS

Overview

Chromecast (as well as AirPlay) utilize a discovery protocol to advertise services on a device. This is done through Multicast DNS. mDNS is a link local discovery protocol and therefore doesn't traverse VLANs natively.

Configuring a HP Procurve

Enable mDNS

conf t
mdns enable

Configure the nDNS Gateway

conf t
mdns gateway vlan 100-103,110

Create a mDNS Profile

conf t
mdns profile "Google" rule 1 service "googlecast" action permit
mdns profile "Google" vlan 100-103,110

Enable IGMP Snooping

IGMP Snooping allows the switch limit multicast to only ports that are using it.

conf t
vlan 100-103,110
ip igmp

Verify IGMP

You can check which ports have IGMP traffic by running the following command:

sh ip igmp

or for a specific VLAN

sh ip igmp vlan 110

Testing

Place a Google casting device on one of the VLANS listed above (lets say 110), and your mobile phone on another (say VLAN 103). Now try to cast to from the YouTube or another Cast capable app. You should see your Google cast devices. If not, check #Verify_IGMP

References

https://www.youtube.com/watch?v=gMUnkp6Ao8o