Planet GS-5220 Series User Manual page 560

individual applications or protocols.
A communications network transports a multitude of applications and data, including high-quality
video and delay-sensitive data such as real-time voice. Networks must provide secure,
predictable, measurable, and sometimes guaranteed services.
Achieving the required QoS becomes the secret to a successful end-to-end business solution.
Therefore, QoS is the set of techniques to manage network resources.
QoS class
Every incoming frame is classified to a QoS class, which is used throughout the device for
providing queuing, scheduling and congestion control guarantees to the frame according to what
was configured for that specific QoS class. There is a one to one mapping between QoS class,
queue and priority. A QoS class of 0 (zero) has the lowest priority.
R
RARP
RARP is an acronym for Reverse Address Resolution Protocol. It is a protocol that is used to obtain an IP
address for a given hardware address, such as an Ethernet address. RARP is the complement of ARP.
RADIUS
RADIUS is an acronym for Remote Authentication Dial In User Service. It is a networking protocol that
provides centralized access, authorization and accounting management for people or computers to
connect and use a network service.
RDI
RDI is an acronym for Remote Defect Indication. It is an OAM functionality that is used by a MEP to
indicate defect detected to the remote peer MEP
Router Port
A router port is a port on the Ethernet switch that leads switch towards the Layer 3 multicast device.
RSTP
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