Cisco NM-8B-U - HW ROUTERS L-M User Manual page 242

16- and 36-Port Ethernet Switch Module for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series
Glossary
Glossary
802.1d—IEEE standard for MAC bridges.
802.1p—IEEE standard for queuing and multicast support.
802.1q—IEEE standard for VLAN frame tagging.
802.1x—IEEE standard for port-based network access control.
ACE—access control entry. Entry in an access control list.
ACL—access control list. Used for security or as a general means to classify traffic.
AgPort—aggregate port (another name for EtherChannel).
ATM—Asynchronous Transfer Mode. The international standard for cell relay in which multiple service
types (such as voice, video, or data) are conveyed in fixed-length (53-byte) cells. Fixed-length cells
allow cell processing to occur in hardware, thereby reducing transit delays. ATM is designed to take
advantage of high-speed transmission media such as E3, SONET, and T3.
authentication server—Entity that validates the credentials of a host trying to obtain access to the
network.
authenticator—Entity that enforces authentication rules for hosts connecting to a LAN via one of its
ports.
authorization state—The state of a controlled port. It can be authorized (access allowed) or
unauthorized (access denied).
AVVID—Architecture for voice, video, and integrated data.
BRI—Basic Rate Interface. ISDN interface comprising two B channels and one D channel for
circuit-switched communication of voice, video, and data.
CAC—connection admission control. Set of actions taken by each ATM switch during connection setup
to determine whether a connection's requested QoS will violate the QoS guarantees for established
connections. CAC is also used when routing a connection request through an ATM network.
candidate—Switch that is not part of a cluster, but is eligible to join a cluster because it meets the
qualification criteria of the cluster.
classification—Process of sorting incoming packets by examining fields of interest in the packet header.
Fields can be addresses, ports, DSCP value, and so on.
CBWFQ—class-based weighted fair queuing. Extends the standard WFQ functionality to provide
support for user-defined traffic classes.
CCN—Cisco Communications Network (Cisco IP phones and IP PBX).
cluster—Group of switches that are managed as a single device. A cluster comprises one commander
and multiple members.
cluster commander—Switch that provides the primary management interface to a cluster.
cluster member—Member switch that is managed through the cluster commander.
CoS—Class of Service. An indication of how an upper-layer protocol requires a lower-layer protocol to
treat its messages. In SNA subarea routing, CoS definitions are used by subarea nodes to determine the
optimal route to establish a session. A CoS definition comprises a virtual route number and a
transmission priority field. Also called ToS.
DSCP—differentiated services code point. In QoS, a modification of the type of service byte. Six bits
of this byte are being reallocated for use as the DSCP field, where each DSCP specifies a particular
per-hop behavior that is applied to a packet.
Cisco IOS Release 12.2(2)XT, 12.2(8)T, and 12.2(15)ZJ
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