![]() This feature is disabled by default and you can enable/disable it per WLAN after you enable it globally. The mDNS Gateway feature introduced on AireOS Wireless Controllers is also supported on Catalyst 9800 Wireless Controllers from 16.11.1. Ideally, it is better to filter mDNS traffic with the use of mDNS Gateway as explained in the next section. Therefore, mDNS will work in C9800 without special configuration as long as the devices involved in mDNS handshake (like client and Chromecast for example) are on the same subnet. Both scenarios, C9800 also bridges the mDNS packets into the wired at the VLAN of the client that originated the mDNS packet. If Access Point (AP) Control and Provisioning of Wireless Access Points (CAPWAP) Multicast-Multicast mode is enabled, C9800 bridges each mDNS packet to the AP multicast group configured on the controller so wireless clients can receive it, otherwise, it will create a copy of each mDNS packet received, which is then bridged individually to every single AP via CAPWAP unicast tunnel. This is the default behavior without specific configuration required, as not even Global mDNS needs to be enabled to allow mDNS Bridging to work, however, you can disable it per WLAN if needed by just changing the mDNS mode at WLAN settings. The dataplane enables mDNS bridging functionality for packets received on the wired ports and wireless interfaces for each WLAN by default. In C9800 Architecture, mDNS (Bonjour Protocol) Bridging refers to same L2 broadcast domain Bonjour TTL=1 protocol packet forwarding. ![]() If your network is live, ensure that you understand the potential impact of any command. All of the devices used in this document started with a cleared (default) configuration. ![]() The information in this document was created from the devices in a specific lab environment. The information in this document is based on these software and hardware versions: Prerequisites RequirementsĬisco recommends that you have knowledge of these topics: It also explains how this special multicast traffic known as mDNS (or Bonjour) is handled by C9800 controllers. This document describes how to configure and verify/troubleshoot the multicast Domain Name Services (mDNS) Gateway feature on Catalyst 9800 Wireless Controllers. ![]()
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