Brocade Communications Systems Brocate Ethernet Access Switch 6910 User Manual

Page 1174

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1124

Brocade 6910 Ethernet Access Switch Configuration Guide

53-1002581-01

Glossary and Acronyms

D

DiffServ

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.

GMRP

Generic Multicast Registration Protocol. GMRP allows network devices to register end stations with
multicast groups. GMRP requires that any participating network devices or end stations comply
with the IEEE 802.1p standard.

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