When mDNS is enabled globally, the controller sends mDNS queries to 224.0.0.251 for all the services on wired (management and dynamic interfaces) and wireless network. Additionally, it can contain one or more subtype identifiers. AppleTV service uses: _airplay._tcp.local. A service type always contains the service name and the protocol. Service strings are used to match service instances to service queries. WLC listens to these default services if you does not have a customized mDNS profile created as shown in the image.Įach of these services has a service string associated with it. These steps are described as follows: Step 1. There are basic four steps which take place when mDNS runs on a Cisco WLC. This way you can have the sources and clients in different subnets. For example, Apple TV and responds back to Bonjour clients when they ask/request for a service. The WLC listens for Bonjour services, caches these Bonjour advertisements (AirPlay, AirPrint, and so on) from the source/host. In order to address this issue, the Cisco Wireless LAN Controller (WLC) acts as a Bonjour Gateway. This meant that all the service providers/sources (which advertise the service) and Bonjour clients(which ask for service) had to be in the same subnet. Routers cannot use multicast routing to redirect the traffic because the time to live (TTL) is set to 1. The address used by the Bonjour protocol is link-local multicast address and therefore is only forwarded to the local L2 network. This protocal uses mDNS on UDP port 5353. Each query or advertisement is sent to the Bonjour multicast address ipv4 224.0.0.251 (ipv6 FF02::FB). The Bonjour protocol operates on service announcements and service queries. Background Informationīonjour protocol is an Apple service discovery protocol which locates devices and sevices on a local network with the use of multicast Domain Name System (mDNS) service records. 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: Basic knowledge of how to configure mDNS on WLC.Prerequisites RequirementsĬisco recommends that you have knowledge of these topics: This document describes the implementation of the Bonjour protocol on the wireless controller and provides guidelines to help troubleshoot issues.
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