Reference Guide

that have identified themselves as interested in receiving the originating computer's content. When all
hosts leave a group, the router no longer forwards packets that arrive for the multicast group.
LAG
A Link Aggregation Group is the logical high-bandwidth link that results from grouping multiple
network links in link aggregation (or load sharing). You can configure static LAGs or dynamic LAGs
(using the LACP).
LLDP
Link Layer Discovery Protocol conforms to IEEE 802.1ab and is a neighbor discovery protocol. Each
LLDP-enabled device transmits information to its neighbors, including chassis and port identification,
system name and description, VLAN names, and other selected networking information. The protocol
also specifies timing intervals in order to ensure current information is being transmitted and received.
MD5
Message-Digest algorithm is a hash function that is commonly used to generate a 128-bit hash value. It
was designed by Ron Rivest in 1991. MD5 is ocially defined in RFC 1321 - The MD5 Message-Digest
Algorithm.
MIC
Message Integrity Check (or Code), also called ‘Michael’, is part of WPA and TKIP. The MIC is an
additional 8-byte code inserted before the standard 4-byte ICV appended in by standard WEP to the
802.11 message. This greatly increases the diculty in carrying out forgery attacks.
Both integrity check mechanisms are calculated by the receiver and compared against the values sent
by the sender in the frame. If the values match, there is assurance that the message has not been
tampered with.
MLAG
The Multi-switch Link Aggregation Group feature allows users to combine ports on two switches to
form a single logical connection to another network device. The other network device can be either a
server or a switch that is separately configured with a regular LAG (or appropriate server port teaming)
to form the port aggregation.
MSTP
Multiple Spanning Tree Protocol, based on IEEE 802.1Q-2003 (formerly known as IEEE 892.1s), allows
you to bundle multiple VLANs into one STP topology, which also provides enhanced loop protection
and better scaling. MSTP uses RSTP as the converging algorithm and is compatible with legacy STP
protocols.
netmask
A netmask is a string of 0s and 1s that mask, or screen out, the network part of an IP address, so that
only the host computer part of the address remains. A frequently-used netmask is 255.255.255.0, used
for a Class C subnet (one with up to 255 host computers). The ".0" in the netmask allows the specific
host computer address to be visible.
OSPF
An interior gateway routing protocol for TCP/IP networks, Open Shortest Path First uses a link state
routing algorithm that calculates routes for packets based on a number of factors, including least hops,
speed of transmission lines, and congestion delays. You can also configure certain cost metrics for the
Glossary
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