Cisco NM-8B-U User Guide - Page 242
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UPC - 074632001001
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Glossary 16- and 36-Port Ethernet Switch Module for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series 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. 242 Cisco IOS Release 12.2(2)XT, 12.2(8)T, and 12.2(15)ZJ