Configuring Access Guardian Bring Your Own Devices (BYOD) Overview
OmniSwitch AOS Release 8 Network Configuration Guide December 2017 page 28-132
Zero Configuration Networking (mDNS and SSDP)
Zero configuration networking is a set of protocols that can be used to discover services. It allows
communications between network devices and allowing them to advertise and share each others'
resources. To resolve the service information, the mDNS client broadcast a query message asking for the
device containing the requested service to identify itself. The target machine then multicasts a message
that includes its IP address and capabilities. All machines in that subnet will use that information to update
their mDNS caches.
Bonjour is Apple's implementation of zero-configuration networking. Apple's Bonjour protocol, built on
multicast DNS, is a Layer 2 non-routable protocol. This means that only clients on the same subnet as the
AirPrint and AirPlay enabled devices can see those services. On a network that has multiple subnets, the
multicast DNS advertisements will not reach users on different subnets. Enterprises, schools, universities
and many other environments are typically built with multiple subnets, which means that although Apple
services may be available to users, they will not be visible to them.
Similarly DLNA (Digital Living Network Alliance) is a standard that is derived from UPnP (Universal
Plug and Play). DLNA uses SSDP (Simple Service Discovery Protocol) for service discovery on the
network. It provides the ability to share digital media services for Android or Windows devices. The
SSDP protocol also has the same limitation of local subnet scope.
Hence, the zero configuration mDNS and SSDP solution is developed to extend mDNS and SSDP across
Layer 3.
The zero configuration mDNS and SSDP solution allows:
• mDNS and SSDP compatible devices to discover network services across IP subnet boundaries.
• Selective sharing of network services based on sharing rules for mDNS or SSDP capable devices.
Sharing rules are defined based on VLAN, access role profile (UNP), location, username and MAC
address.
• To provide the solution that is unified across wire or wireless (Aruba AP) network.
• Multicast optimization over the wireless (Aruba AP) network.
The mDNS or SSDP packet handling across Layer 3 supports the following modes of operation:
• Tunnel (Aruba) Mode: Supports mDNS or SSDP compatible devices with Aruba controller with GRE
tunnel protocol type 0x0. This is the default mode of operation.
• Tunnel Standard Mode: Supports tunneling for mDNS or SSDP compatible devices to an
OmniSwitch responder with GRE tunnel protocol type 0x6558. Only mDNS or SSDP over IPv4 is
supported.
• Gateway Mode: Supports mDNS or SSDP compatible devices to discover network services across IP
subnet boundaries or VLANs. Only mDNS or SSDP over IPv4 is supported.
• Responder Mode: Supports mDNS or SSDP compatible devices with an OmniSwitch as a core switch
(Responder). Only mDNS or SSDP over IPv4 is supported.
To Next Page
Loading...
