Allied Telesis AlliedWare Plus Operating System Version 5.4.4C (x310-26FT,x310-26FP,x310-50FT,x310-50FP) - Manual (Page 2211)

Appendix B: Glossary
Software Reference for x310 Series Switches
C613-50046-01 REV A AlliedWare Plus TM Operating System - Version 5.4.4C B.21
Q
Query Solicitation
Query Solicitation minimizes the loss of multicast data after a topology change on
networks that use
EPSR or spanning tree ( STP , RSTP , or MSTP ) for loop protection.
Without Query Solicitation, when the underlying link layer topology changes, multicast
data flow can stop for up to several minutes, depending on which port goes down and
how much of the IGMP query interval remained at the time of the topology change. Query
Solicitation greatly reduces this disruption.
For more information see “Query Solicitation” on page 30.8 .
QoS
Quality of Service. QoS enables you to both prioritize traffic and limit its available
bandwidth. The concept of QoS is a departure from the original networking protocols, in
which all traffic on the Internet or within a LAN had the same available bandwidth.
Without QoS, all traffic types are equally likely to be dropped if a link becomes
oversubscribed. This approach is now inadequate in many networks, because traffic levels
have increased and networks often carry time-critical applications such as streams of real-
time video data. QoS also enables service providers to easily supply different customers
with different amounts of bandwidth. Configuring Quality of Service involves two
separate stages:
■ Classifying traffic into flows, according to a wide range of criteria. Classification is
performed by the switch’s
Class maps .
■ Acting on these traffic flows.
For more information see Chapter 38, Quality of Service (QoS) Introduction .
Quality of Service
See QoS .
R
RADIUS
Remote Authentication Dial-In User Service. RADIUS is a networking protocol that
provides centralized
AAA (Authentication Authorization and Accounting) management
for clients to a network. RADIUS is a client/server protocol that runs in the application
layer, using UDP (User Datagram Protocol) for data transport. RADIUS authenticates users
before granting them access to network resources and can account for the usage of
network resources.
For more information see Chapter 46, RADIUS Introduction and Configuration . For
configuration examples see “RADIUS Configuration Examples” on page 46.15 .
Redistribute
Advertise routes learned from one routing protocol into another routing protocol.