Edge-Core AS5700-54X, Cli Reference Manual, Page: 1087 / 1116

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.
MVR
Multicast VLAN Registration is a method of using a single network-wide multicast VLAN to
transmit common services, such as such as television channels or video-on-demand, across
a service-provider’s network. MVR simplifies the configuration of multicast services by using
a common VLAN for distribution, while still preserving security and data isolation for
subscribers residing in both the MVR VLAN and other standard or
private VLAN groups.
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.
OSPF
Open Shortest Path First is a link-state routing protocol that functions better over a larger
network such as the Internet, as opposed to distance-vector routing protocols such as RIP. It
includes features such as unlimited hop count, authentication of routing updates, and
Variable Length Subnet Masks (VLSM).
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.