Interlogix NS3550-8T-2S User Manual - Manual (Page 488)

User’s Manual of NS3550-8T-2S
488
IP
IP is an acronym for Internet Protocol. It is a protocol used for communicating data across a internet network.
IP is a "best effort" system, which means that no packet of information sent over it is assured to reach its destination in
the same condition it was sent. Each device connected to a Local Area Network (LAN) or Wide Area Network (WAN) is
given an Internet Protocol address, and this IP address is used to identify the device uniquely among all other devices
connected to the extended network.
The current version of the Internet protocol is IPv4, which has 32-bits Internet Protocol addresses allowing for in
excess of four billion unique addresses. This number is reduced drastically by the practice of webmasters taking
addresses in large blocks, the bulk of which remain unused. There is a rather substantial movement to adopt a new
version of the Internet Protocol, IPv6, which would have 128-bits Internet Protocol addresses. This number can be
represented roughly by a three with thirty-nine zeroes after it. However, IPv4 is still the protocol of choice for most of
the Internet.
IPMC
IPMC is an acronym for IP MultiCast.
IP Source Guard
IP Source Guard is a secure feature used to restrict IP traffic on DHCP snooping untrusted ports by filtering traffic
based on the DHCP Snooping Table or manually configured IP Source Bindings. It helps prevent IP spoofing attacks
when a host tries to spoof and use the IP address of another host.
L
LACP
LACP is an IEEE 802.3ad standard protocol. The Link Aggregation Control Protocol, allows bundling several physical
ports together to form a single logical port.
LLDP
LLDP is an IEEE 802.1ab standard protocol.
The Link Layer Discovery Protocol(LLDP) specified in this standard allows stations attached to an IEEE 802 LAN to
advertise, to other stations attached to the same IEEE 802 LAN, the major capabilities provided by the system
incorporating that station, the management address or addresses of the entity or entities that provide management of
those capabilities, and the identification of the stations point of attachment to the IEEE 802 LAN required by those
management entity or entities. The information distributed via this protocol is stored by its recipients in a standard
Management Information Base (MIB), making it possible for the information to be accessed by a Network Management
System (NMS) using a management protocol such as the Simple Network Management Protocol (SNMP).
LLDP-MED
LLDP-MED is an extendsion of IEEE 802.1ab and is defined by the telecommunication industry association
(TIA-1057).
LOC
LOC is an acronym for Loss Of Connectivity and is detected by a MEP and is indicating lost connectivity in the network.
Can be used as a switch criteria by EPS
M
MAC Table
Switching of frames is based upon the DMAC address contained in the frame. The switch builds up a table that maps
MAC addresses to switch ports for knowing which ports the frames should go to ( based upon the DMAC address in
the frame ). This table contains both static and dynamic entries. The static entries are configured by the network
administrator if the administrator wants to do a fixed mapping between the DMAC address and switch ports.
The frames also contain a MAC address ( SMAC address ), which shows the MAC address of the equipment sending
the frame. The SMAC address is used by the switch to automatically update the MAC table with these dynamic MAC
addresses. Dynamic entries are removed from the MAC table if no frame with the corresponding SMAC address have
been seen after a configurable age time.
MEP