Web Management Guide-R07

Table Of Contents
Glossary
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MRD Multicast Router Discovery is a A protocol used by IGMP snooping and multicast routing
devices to discover which interfaces are attached to multicast routers. This process allows
IGMP-enabled devices to determine where to send multicast source and group
membership messages.
MSTP Multiple Spanning Tree Protocol can provide an independent spanning tree for different
VLANs. It simplifies network management, provides for even faster convergence than RSTP
by limiting the size of each region, and prevents VLAN members from being segmented
from the rest of the group.
Multicast Switching A process whereby the switch filters incoming multicast frames for services for which no
attached host has registered, or forwards them to all ports contained within the designated
multicast VLAN group.
NTP Network Time Protocol provides the mechanisms to synchronize time across the network.
The time servers operate in a hierarchical-master-slave configuration in order to
synchronize local clocks within the subnet and to national time standards via wire or radio.
Out-of-Band
Management
Management of the network from a station not attached to the network.
Port Authentication See IEEE 802.1X.
Port Mirroring A method whereby data on a target port is mirrored to a monitor port for troubleshooting
with a logic analyzer or RMON probe. This allows data on the target port to be studied
unobstructively.
Port Trunk Defines a network link aggregation and trunking method which specifies how to create a
single high-speed logical link that combines several lower-speed physical links.
QoS Quality of Service. QoS refers to the capability of a network to provide better service to
selected traffic flows using features such as data prioritization, queuing, congestion
avoidance and traffic shaping. These features effectively provide preferential treatment to
specific flows either by raising the priority of one flow or limiting the priority of another
flow.
RADIUS Remote Authentication Dial-in User Service. RADIUS is a logon authentication protocol that
uses software running on a central server to control access to RADIUS-compliant devices on
the network.