C9800CL - Wireless display across different networks

[Denis Negik]

Good day. C9800-CL. There are two Wi-Fi networks, guest and work. There is a TV that is used as a wireless display. Connected to the guest network. Users of the work network see it as a wireless display, but cannot connect to it. I read that this can be solved using mDNC, but I have not found any specific examples. How can I solve my problem?

[marce1000]

  - @Denis Negik   What do you mean by 'connecting to it' ; I presume they are not trying to connect to the TV ?
                             (please elaborate)

  M.

[Denis Negik]

It needs to be able to be used from both networks

[marce1000]

   - @Denis Negik     How is it used on the guest network, do you mean that users are connecting to the  wireless of the TV ?

  M.

[Denis Negik]

The TV and users (guests) are connected to one guest network deployed on c9800

[marce1000]

  - @Denis Negik   Your guest network, will be shielded (or should be)  from the rest, including work ; so you need to
                             redesign the setup to meet your purposes

  M.

[Scott Fella]

I'm assuming you mean "mDNS" not "mDNC".  Do you really want your secure environment and guest to interact?  You should of also provided more information, like what TV brand, how users are trying to connect like mirror, using an app, etc.  If you really want to do this, then research how to configure mDNS on the 9800 and that will show you what you need on the 9800-CL and on your infrastructure. It might be easier to keep the TV on guest and then get another player, like a Roku, Apple TV, etc. connected to a hdmi which would be connected to your work SSID.  

If this is for guest use, then internal employees shouldn't ask to use it, but its up to you at the end of the day.

[Rich R]

If you want the TV to be accessible on both networks then you will need routing and mDNS gateway configured between the 2 networks.  Like Scott and Marc say that sounds inherently insecure - normally guest and corporate networks are kept completely separate for security reasons.  If you don't care about the security then why do you have separate networks - just have a single network for everybody.  Refer to the Best Practices guide (link below) and the Configuration guide if you want to configure mDNS gateway.  Also see 
https://www.cisco.com/c/en/us/support/docs/wireless/catalyst-9800-series-wireless-controllers/215352-configure-and-troubleshoot-mdns-on-catal.html
https://www.cisco.com/c/en/us/support/docs/wireless/catalyst-9800-series-wireless-controllers/222239-configure-flexconnect-mdns-in-9800-wirel.html
https://www.cisco.com/c/dam/en/us/td/docs/wireless/controller/9800/17-3/deployment-guide/c9800-mDNS-technical-guide-rel-17-3.pdf
https://www.ciscolive.com/c/dam/r/ciscolive/global-event/docs/2024/pdf/TACENT-2019.pdf