Information About mDNS for kWAAS
Overview of Service Discovery on mDNS for kWAAS
Software modules within the Cisco software need to be able to discover services of interest. These services are announced via the multicast Domain Name System (mDNS) Service Discovery protocol. The Layer 2 domain DNS helps with the auto-discovery of these services with its capability of multicasting and decentralizing the mDNS service discovery.
mDNS service discovery is performed using IP multicast. IP multicast is the process of sending multiple IP data packets to a receiver in a single transmission.
The multicast Domain Name System (mDNS) for kWAAS implements the mDNS Service Discovery protocol, provides the API layer, and enables kWAAS to easily discover wide-area services advertised by other Cisco IOS devices.
After service discovery, the mDNS Service Discovery protocol lets you retrieve information about the cached mDNS resource records, the different mDNS requests in queue, and the mDNS statistics about the packet relays.
Note |
The mDNS for kWAAS feature is enabled by default on Cisco devices. There are no configuration tasks, and this feature cannot be disabled. |
Overview of IP Networking on mDNS for kWAAS
The mDNS for kWAAS feature utilizes the service discovery protocol, which provides a way to announce and discover services on the local network, thereby enabling wireless Cisco software device clients to access services advertised in a different IP network.
multicast Domain Name System (mDNS) performs DNS queries over IP multicast. mDNS supports zero configuration IP networking. Zero configuration IP networking consists of processes that let you devise an automated IP network, without the need for any intervention by a network administrator. The zero configuration IP networking method does not need any special configuration servers.
As a standard, mDNS uses multicast IP address 224.0.0.251 as the destination address and 5353 as the UDP destination port.
Note |
The mDNS for kWAAS feature is enabled by default on Cisco devices. There are no configuration tasks, and this feature cannot be disabled. |