LevelOne GTL-2691 User Manual

Page 1614

LOSSARY

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IFF

ERV

Differentiated Services provides quality of service on large networks by

employing a well-defined set of building blocks from which a variety of

aggregate forwarding behaviors may be built. Each packet carries

information (DS byte) used by each hop to give it a particular forwarding

treatment, or per-hop behavior, at each network node.

DiffServ

allocates

different levels of service to users on the network with mechanisms such as

traffic meters, shapers/droppers, packet markers at the boundaries of the

network.

DNS

Domain Name Service. A system used for translating host names for

network nodes into IP addresses.

DSCP

Differentiated Services Code Point Service. DSCP uses a six-bit tag to

provide for up to 64 different forwarding behaviors. Based on network

policies, different kinds of traffic can be marked for different kinds of

forwarding. The DSCP bits are mapped to the Class of Service categories,

and then into the output queues.

EAPOL

Extensible Authentication Protocol over LAN. EAPOL is a client

authentication protocol used by this switch to verify the network access

rights for any device that is plugged into the switch. A user name and

password is requested by the switch, and then passed to an authentication

server (e.g., RADIUS) for verification. EAPOL is implemented as part of the

IEEE 802.1X Port Authentication standard.

EUI

Extended Universal Identifier is an address format used by IPv6 to identify

the host portion of the network address. The interface identifier in EUI

compatible addresses is based on the link-layer (MAC) address of an

interface. Interface identifiers used in global unicast and other IPv6

address types are 64 bits long and may be constructed in the EUI-64

format. The modified EUI-64 format interface ID is derived from a 48-bit

link-layer address by inserting the hexadecimal number FFFE between the

upper three bytes (OUI field) and the lower 3 bytes (serial number) of the

link layer address. To ensure that the chosen address is from a unique

Ethernet MAC address, the 7th bit in the high-order byte is set to 1

(equivalent to the IEEE Global/Local bit) to indicate the uniqueness of the

48-bit address.

GARP

Generic Attribute Registration Protocol. GARP is a protocol that can be used

by endstations and switches to register and propagate multicast group

membership information in a switched environment so that multicast data

frames are propagated only to those parts of a switched LAN containing

registered endstations. Formerly called Group Address Registration

Protocol.