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Cajun P550/P880 ATM Uplink User Guide, Version 1.1
G-5
Flood Frame A unicast frame sent to all devices in the network; it is intended for
an endstation whose physical location has yet to be learned.
Generic Flow
Control (GFC) Field
Four priority bits in an ATM header. The default setting (four zeros)
indicates that the cell is uncontrolled, meaning that it does not take
precedence over another cell when contending for a virtual circuit.
Setting any of the bits in the GFC field tells the target endstation tha
the switch can implement some form of congestion control. The
endstation echoes this bit back to the switch to confirm that it can
set priorities. The switch and endstation can use the GFC field to
prioritize voice over video, for example, or indicate that both voice
and video take precedence over other types of data.
Header The five bytes in an ATM cell that supply addressing and control
information, including generic flow control, virtual path identifier,
virtual circuit identifier, payload type, and cell-loss priority.
Header Error
Control (HEC)
The last one-byte field in an ATM cell’s five-byte header. The HEC
field contains information that is used to detect and correct errors in
the cell header. These types of errors are likely to corrupt addressing
fields, causing the network to deliver the cell to the wrong
destination or drop the cell and request retransmission.
Internet
Engineering Task
Force (IETF)
The technical organization that establishes specifications and
standards for the Internet.
Internet Group
Management
Protocol (IGMP)
A protocol that allows the network to locate group members via
querying. Also enables endstations to join and leave the multicast
group.
Interim Interswitch
Protocol (IISP)
A signaling protocol that allows inter-switch connectivity in private
networks, in a multivendor environment.
Interim Local
Management
Interface (ILMI)
Supports bidirectional exchange of management information
between UNI Management Entities (UMEs) related to UNI ATM
layer and physical layer parameters.
IPmc IP multicast is a set of IETF specifications that support user-defined
multicast groups.
LAN Emulation
(LANE)
An ATM Forum method for bridging Ethernet and Token Ring traffic
over ATM, to provide multivendor networking. LANE defines a
standard interface between edge devices and the ATM backbone.
LANE operates at layer-2 of the OSI model, and supports all LAN
protocols.