Digitus DN-80233, User Manual

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are specific to the operation of the GARP Application concerned.
Gigabit Ethernet.
A high-speed Ethernet connection.
GIP.
See “GARP Information Propagation” on page 296.
GMRP.
See “GARP Multicast Registration Protocol” on page 296.
GPCM.
See “General Purpose Chip-select Machine” on page 297.
GVD.
GARP VLAN Database.
GVRP.
See “GARP VLAN Registration Protocol.” on page 297.
H
.h file.
Header file in C code. Contains function and coding definitions.
HAPI.
See “Hardware Abstraction Programming Interface” on page 297.
Hardware Abstraction Programming Interface.
HAPI is the module that contains the NP specific
software that interacts with the hardware.
hop count.
The number of routers that a data packet passes through on its way to its destination.
I
ICMP.
See “Internet Control Message Protocol” on page 297.
IGMP.
See “Internet Group Management Protocol” on page 297.
IGMP Snooping.
A series of operations performed by intermediate systems to add logic to the network
to optimize the flow of multicast traffic; these intermediate systems (such as Layer 2 switches) listen for
IGMP messages and build mapping tables and associated forwarding filters, in addition to reducing the
IGMP protocol traffic. See “Internet Group Management Protocol” on page 297 for more information.
Internet Control Message Protocol.
ICMP is an extension to the Internet Protocol (IP) that supports
packets containing error, control, and informational messages. The PING command, for example, uses
ICMP to test an Internet connection.
Internet Group Management Protocol.
IGMP is the standard for IP Multicasting on the Internet. IGMP is
used to establish host memberships in particular multicast groups on a single network. The mechanisms
of the protocol allow a host to inform its local router, using Host Membership Reports, that it wants to
receive messages addressed to a specific multicast group. All hosts conforming to Level 2 of the IP
Multicasting specification require IGMP.
IP.
See “Internet Protocol” on page 297.
IP Multicasting.
Sending out data to distributed servers on the MBone (Multicast Backbone). For large
amounts of data, IP Multicast is more efficient than normal Internet transmissions because the server can
broadcast a message to many recipients simultaneously. Unlike traditional Internet traffic that requires
separate connections for each source-destination pair, IP Multicasting allows many recipients to share the
same source. This means that just one set of packets is transmitted for all the destinations.
Internet Protocol.
The method or protocol by which data is sent from one computer to another on the
Internet. Each computer (known as a host) on the Internet has at least one IP address that uniquely
identifies it among all other computers on the Internet. When you send or receive data (for example, an
e-mail note or a Web page), the message gets divided into little chunks called packets. Each of these
packets contains both the sender's Internet address and the receiver's address. Any packet is sent first to
a gateway computer that understands a small part of the Internet. The gateway computer reads the
destination address and
forwards the packet to an adjacent gateway that in turn reads the destination address and so forth