|
|
ABR
Available Bit Rate. See <hyperBlue>ATM Service Categories
AESA
ATM End Station Address. The 19-octet address that uniquely identifies each logical node.
Annex G
A bidirectional protocol, defined in Recommendation Q.2931, used for monitoring the status of connections across an UNI interface. The SES PNNI controller uses the Annex G protocol to pass connection status information between a itself and the BPX 8600 switch.
ABR: Available Bit Rate is a Class of Service defined for ATM connections by the ATM Forum. Devices using ABR are guaranteed no more than a certain rate of throughput. This rate dynamically changes and the current value is relayed to the sending device by way of Resource Management (RM) cells.
CBR: Constant Bit Rate is used by connection that request a static amount of bandwidth, for continuous availability during the connection lifetime. The amount of bandwidth is characterized <hyperBlue>PCR.
nrtVBR: Non-real-time-variable-bit-rate is intended for non-real-time application that have bursty traffic characteristics, and which are characterized in terms of a <hyperBlue>PCR, <hyperBlue>SCR, and <hyperBlue>MBS.
rtVBR: Real-time-variable-bit-rate is intended for real-time applications that require tightly constrained delay and delay variation (such as voice and video applications). rtVBR is characterized by <hyperBlue>PCR, <hyperBlue>SCR, and <hyperBlue>MBS.
UBR: Unspecified Bit Rate is intended for non-real-time application, such as those that do not require tightly constrained delay and delay variation. Traffic in the UBR class is not guaranteed any particular throughput or delay performance. In this regard, UBR is similar to `traditional' IP service
BCC
The switch control card in the BPX is the Broadband Control Card, which has a 68040 processor.
BPX
The WAN Business Unit's high-end ATM switch is the Broadband Packet Exchange (BPX). The BPX is a carrier-quality switch, with trunk and CPU hot standby redundancy.
SES PNNI Controller
A Service Expansion Shelf outfitted with two Processor Switch Modules (PXMs) running PNNI and ATM SVC software. In this application, the PBX SES PNNI Controller is attached to and controls the BPX switch to provide PNNI networking and ATM SVCs.
BXM
The Broadband Switch Module (BXM) cards are ATM port cards for the BPX switch, which use the Monarch chipset.
CBR
Constant Bit Rate. See also <hyperBlue>ATM Service Categories.
A buffer or queue which serves connections with similar QoS requirements.
Class of Service (CoS) Buffer Descriptor Template
A component of a Service Class Template which contains Class of Service Buffer configurations indexed by CoSB number. Note: A Qbin is a platform-specific (BXM in this case) instance of the more general <hyperBlue>Class of Service (CoS) Buffer.
CommBus
The CommBus is the BPX's internal messaging bus.
Community
In the context of SNMP, a relationship between an agent and a set of SNMP managers that defines security characteristics. The community concept is a local one. defined at the agent. The agent establishes one community for each desired combination of authentication, access control, and proxy characteristics. Each community is given a unique (within this agent) community name, and the management stations within that community are provided with and must employ the community name in all get and set operations. The agent may establish a number of communities, with overlapping management station membership.
CosB: See Class of Service (CoS) Buffer
DCC
Data Country Code.
DTL
Designated Transit List.
Enterprise MIB
A MIB module defined in the enterprise-specific portion of the Internet management space
Feeder
A Feeder is a small switch which acts as an extension shelf, typically with lower-bandwidth interfaces, for a larger switch. The larger switch is referred to as the Routing Node for the Feeder(s).
ICD
International Code Designator.
IISP
Interim Inter-switch Protocol.
ILMI
Integrated Local Management Interface.
LCN
Each interface card in a switch has a certain number of Logical Connection Numbers. A Logical Connection Number is used for each cross connect leg through the card in question. "LCN" is often roughly synonymous with "cross connect leg". In VSI terminology, and LCN is an example of an Other End Reference.
LGN
Logical Group Node.
Logical Interface
Each physical interface and every virtual trunk endpoint on a platform is represented to the VSI Controllers as a different Logical Interface with partitions, and other VSI configuration. Logical Interface numbers are 32-bit with a format which is, in general, known only to the platform.
Logical Link
Either a physical link or a VPC PVC across another ATM network. Logical links are referred to as horizontal links (if connecting logical nodes within a pair) or outside links (if connecting peer groups).
Managed device
A device containing a network management agent implementation. C5K is a managed device
Maximum Burst Size.
MIB
Management Information Base, a structured set of data variables, called objects, in which each variable represents some resource to be managed.
MIB-II
Internet-standard MIB, RFC 1213
Monarch
The ATM interface chipset used on recent WANBU port cards.
NSAP
Network Service Access Point.
NIC
Network Interface Card. An ATM card for a host or router is an ATM NIC.
nrtVBR
Non-real-time-variable-bit-rate. See also <hyperBlue>ATM Service Categories.
Object
In the context of SNMP, a data variable that represents some resource or other aspect of a managed device
Object type
Defines a particular kind of managed object. The definition of an object type is therefore a syntactic description
Peak Cell Rate
PGL
Peer Group Node.
PNNI
Private Network-to-Network Interface
PNNI RCC
PNNI routing control channel. See RCC.
Port
The VSI makes no distinction between trunk ports and end-point ports. "Port" is synonymous with "Interface".
PTSE
PNNI Topology State Element.
PXM
Processor Switch Module. The processor card used in the MGX 8800 series switches and in the Service Expansion Shelf. In the SES PNNI controller application, described in this manual, only PXMs (active and standby), running PNNI and ATM SVC software, are installed in the SES. There are no service modules used.
Qbin
A Qbin is a platform-specific (BXM in this case) instance of the more general Class of Service Buffer (or CosB).
RCC
Routing control channel. A VCC used for the exchange of PNNI routing protocol messages.
RFC
Request For Comment
Routing Node
In tiered networks terminology, a Routing Node is a larger switch to which one or more Feeders is or SES PNNI controllers is attached.
rtVBR
Real-time-variable-bit-rate. See also <hyperBlue>ATM Service Categories.
Service Class (aka Service Type, or Service Category)
A concept for grouping connections that share a common set of traffic characteristics and QoS requirements.
Service Class database
The collection of data items which support the Service Class Template concept, and implemented on a per-VI basis on the BXM. These items include a copy of the specific Service Class Template selected for a VI, as well as additional data as required.
Service Class Template (SCT)
A set of data structures which map VSI Service Types to sets of pre-configured VC and Qbin parameters. Consists of two sub-components - a VC Descriptor Template and a Class of Service Buffer Descriptor Template.
Service Expansion Shelf
A flexible 7-slot chassis which can be outfitted with MGX 8800 modules for a variety of applications. As a SES PNNI controller, the SES contains only two PXM modules running PNNI and ATM SVC software, and no service modules; it acts as a virtual switch interface controller to control the BPX switch for PNNI networking and ATM SVCs.
Sustainable Cell Rate.
SNMP
Simple Network Management Protocol
SVC
Switched Virtual Circuit.
SPVC
Smart/Soft Permanent Virtual Circuit. As related to ATM, either of two kinds of SPVCs: smart permanent virtual path connections (SPVPCs) and smart permanent virtual channel connections (SPVCCs).
UBR
Unspecified Bit Rate. See also <hyperBlue>ATM Service Categories.
UNI
User-to-Network Interface.
Variable Binding (Varbind)
A pairing of an object instance name and associated value in an SNMP MIB.
VC
ATM and Frame Relay traffic is carried in Virtual Channels which are set up between adjacent ATM or Frame Relay switches before data transmission occurs. An ATM link between switches may support up to 228 different VCs, although a small number of VCs is reserved for special purposes.
VCC
Traffic is carried end-to-end on an ATM network on Virtual Channel Connections, which consist of a sequence of Virtual Channels between switches linked by VC cross-connects at the switches.
VC Descriptor Template
A component of a Service Class Template which contains platform-specific VC configurations which are indexed primarily by Service Type. Together with a Class of Service Buffer Descriptor Template, it defines a Service Class Template.
VCI
Each VC within a specific Virtual Path on a link has a unique Virtual Channel Identifier, which is a 16-bit number (see also VPCI).
Virtual Trunks
A Virtual Trunk is a Virtual Path Connection which appears to VSI masters as an ordinary trunk (except that the trunk supports 64k VCs at most). In a VSI Platform, a Virtual Trunk end-point has its own Logical Interface.
VP, VPC, VPI
A Virtual Path is a `bundle' of 216 Virtual Connections with the same Virtual Path Identifier; for example, the first 12 bits of the VPCI. Most ATM switches can switch VPs using only a single cross-connect (instead of up to 216). An end-to-end sequence of VPs cross-connected at the intermediate switches is a Virtual Path Connection.
VPCI
Each VC on a link has a unique Virtual Path and Channel Identifier, which is a 28-bit number. The VPCI consists of a 12-bit VPI concatenated with a 16-bit VCI.
VSI
Virtual Switch Interface: this is a common control interface to all WANBU switches, which is implemented first on the BPX. It will be implemented on other switches, both within Cisco and on switches belonging to Cisco's Partner. It embodies both connection management and switch configuration discovery capabilities.
VSI Controller
A controller, such as a PNNI SVC Controller, Portable AutoRoute or Tag Switch Controller, which controls a switch using the VSI.
VSI Master
A VSI Master process implementing the master side of the VSI protocol in a VSI Controller. Sometimes the whole VSI Controller might be referred to as a `VSI Master', but this is not strictly correct.
VSI Platform
A VSI Platform is a switch with one or more VSI Slaves allowing connections to be set up using the VSI.
VSI Slave
A VSI Slave process implementing the slave side of the VSI protocol within a VSI Platform. Sometimes a whole VSI Platform might be referred to as a `VSI Slave', but this is not strictly correct.
VSI2
Virtual Switch Interface, Protocol Version 2: this is revision 2 of a proposed common control interface to all WANBU switches. It embodies both connection management and switch configuration discovery capabilities.
VSI Master
i. A device which controls a VSI switch, e.g. a VSI Tag Switch Controller.
ii. A process implementing the master side of the VSI protocol.
VSI Slave
i. A switch (in the "Single Slave model") or a port card (in the "Multiple Slave Model") which implements the VSI.
ii. A process implementing the slave side of the VSI protocol.
Posted: Thu Jul 27 19:52:36 PDT 2000
Copyright 1989-2000©Cisco Systems Inc.