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Glossary

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Frame Relay bridging

Defined in RFC 1490, this bridging method uses

the identical spanning-tree algorithm as other bridging operations but per-
mits packets to be encapsulated for transmission across a Frame Relay
network.

Frame Relay switching

When a router at a service provider provides

packet switching for Frame Relay packets. A process that activates an inter-
face that has been deactivated by the pruning process. It is initiated by an
IGMP membership report sent to the router.

frame tagging

See: frame identification.

frame types

Used in LANs to determine how a packet is put on the local

network. Ethernet provides four different frame types. These are not com-
patible with each other, so for two hosts to communicate, they must use the
same frame type.

framing

Encapsulation at the Data Link layer of the OSI model. It is called

framing because the packet is encapsulated with both a header and a trailer.

FRAS

Frame Relay Access Support: A feature of Cisco IOS software that

enables SDLC, Ethernet, Token Ring, and Frame Relay-attached IBM
devices to be linked with other IBM mechanisms on a Frame Relay network.
See also: FRAD.

frequency

The number of cycles of an alternating current signal per time

unit, measured in hertz (cycles per second).

FSIP

Fast Serial Interface Processor: The Cisco 7000 routers' default serial

interface processor, it provides four or eight high-speed serial ports.

FTP

File Transfer Protocol: The TCP/IP protocol used for transmitting files

between network nodes, it supports a broad range of file types and is defined
in RFC 959. See also: TFTP.

full duplex

The capacity to transmit information between a sending station

and a receiving unit at the same time. See also: half duplex.

full mesh

A type of network topology where every node has either a phys-

ical or a virtual circuit linking it to every other network node. A full mesh
supplies a great deal of redundancy but is typically reserved for network
backbones because of its expense. See also: partial mesh.

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