Cisco Systems Network Router manual Introduction to Pnni, Pnni Network Database

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C H A P T E R 1

Introduction to PNNI

Private Network-to-Network Interface (PNNI) is a suite of network protocols that can be used to discover an ATM network topology, create a database of topology information, and route calls over the discovered topology. With proper planning, setting up a PNNI network is much easier and faster than manually configuring connections through an ATM network.

This chapter introduces the PNNI network database and the following common network topologies:

•The Single Peer Group Topology

•The Hierarchical PNNI Network Topology

•PNNI Internetworking with AINI

•PNNI Internetworking with IISP

This chapter also provides guidelines on how you can apply these topologies using the following switches:

•Cisco MGX 8830 Release 3.0 and higher

•Cisco MGX 8850 (PXM1E) Release 3.0 and higher

•Cisco MGX 8850 (PXM45) Release 2.0 and higher

•Cisco MGX 8880 Media Gateway Release 5.0 and higher

•Cisco MGX 8950 with Release 2.1.60 or later software

•Cisco BPX 8600 and Cisco Service Expansion Shelf (SES) with SES Release 1.0 or later software

The PNNI Network Database

PNNI is commonly referred to as a link state protocol, which means that the protocol collects information about the current state of links and nodes in the network to build a network database. The PNNI network database can be used to determine the network structure and the current state of network components. To build the PNNI network database, each PNNI node must receive topology information from all the other devices in the network. To keep the database current, the node must receive regular updates from other nodes.

		Cisco PNNI Network Planning Guide for MGX and SES Products, Release 5

	Part Number OL-3847-01 Rev. D0, April, 2004			1-1
	Part Number OL-3847-01 Rev. D0, April, 2004			1-1

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Contents Text Part Number OL-3847-01 Rev. D0 Corporate HeadquartersCopyright 2003, Cisco Systems, Inc All rights reserved Iii N T E N T SCompatible Standards Worksheets Part Number OL-3847-01 Rev. D0, April Vii G U R E SViii B L E S Part Number OL-3847-01 Rev. D0, April Objectives AudienceOrganization Xii ConventionsDocumentation Notes for the April 2004 Product Releases DocumentationRelated Documentation XiiiXiv Technical Manual Order of UseTerms Technical Manual Titles and DescriptionsXvi Xvii Xviii Xix Reference Guides Xxi Xxii Document Title DescriptionXxiii Xxiv Xxv Xxvi Cisco.com Obtaining DocumentationOrdering Documentation XxviiChanges to This Document Chapter ChangesXxviii Documentation Feedback Obtaining Technical AssistanceCisco TAC Website Opening a TAC CaseObtaining Additional Publications and Information TAC Case Priority DefinitionsXxx Xxxi Xxxii Pnni Network Database Introduction to PnniSingle Peer Group Topology Example Single Peer Group Topology Hierarchical Pnni Network TopologyPeer group Ppeer Simple Node Representation Peer Group LeadersSimple Node Representation Complex Node RepresentationPnni Internetworking with Aini Border NodesHierarchical Pnni Network Benefits Example Pnni Internetworking with Aini Topology Pnni Internetworking with IispPart Number OL-3847-01 Rev. D0, April Compatible Standards SpecificationsCapabilities PXM45PXM1E PXM45/BSES Capabilities SESConnection Type Switch Connections CWM Endpoints Connection Limit AdjustmentsSVC DAX SpvcInstall Redundant Hardware in Switches Parallel Links Between Adjacent SwitchesPhysical Network Planning Multiple Links Between Adjacent Peer Groups Planning Guidelines for Individual Peer GroupsMultiple Links to an External Network Multiple Paths Between Network NodesPlanning Guidelines for Hierarchical Networks Planning Guidelines for Peer Group LeadersPlanning Guidelines for Border Nodes Part Number OL-3847-01 Rev. D0, April Address Planning Overview Address and Closed User Group PlanningPnni Addressing Example Selecting an ATM Address Format Planning Address Configuration SettingsESI SEL IDP DSP Supported Address FormatsGuidelines for Selecting an Address Format ATM Field Description Default ValuesAddress Registration Authorities Selecting a Pnni LevelCategory Type Authorities DCC4shows an example topology of a Pnni MPG WAN Part Number OL-3847-01 Rev. D0, April Level Peer Group ID Portion of ATM Address Bytes LengthSelecting the Pnni Peer Group ID Default Peer Group ID20-byte Node Address Selecting the ATM AddressSelecting the Ilmi Address Prefix Selecting the Spvc Address PrefixPlanning Address Prefixes for Aini and Iisp Links Additional Guidelines for Creating an Address Plan Selecting Static Addresses for UNI PortsClosed User Group Example Closed User Group OverviewPlanning CUG Configuration Settings Selecting an Interlock CodeSelecting an Index Selecting CPE Addresses Selecting Internal CUG Access OptionsSpecifying a Preferential CUG Selecting External CUG Access OptionsWorksheets Selecting a Default CUG AddressCUG Part Number OL-3847-01 Rev. D0, April Administrative Weight How MGX and SES Nodes Select RoutesLink and Route Metrics Cell Transfer Delay Cell Delay VariationAvailable Cell Rate Shortest Path Table Routing Maximum Cell RateShortest Path Tables Service Class Acronym Definition Guidelines Class of Service TablesCTD CDV Traffic MetricHow SPVCs and SPVPs use the SPTs How SVCs and SVPs use the SPTsHow MGX and SES Nodes Select Links On-Demand RoutingLoad Balancing for SPT and On-Demand Routing Service Additional Routing Features in MGX and SES NodesPreferred Routing CLR0+12Grooming Priority RoutingPriority Bumping Soft ReroutingBlocking Pass-Through Connections Nodal Point-to-Multipoint Branch RestrictionAXSM/B AXSM/AAXSM-E AXSM-XGFarthest Node Branching Part Number OL-3847-01 Rev. D0, April Aesa ABRAini Ansi APSCBR P2MPCTD IN-2CWM CUGDIN IN-3IN-4 Pnni PGLMGX SES IN-5IN-6 UNI UBRTAC IN-7IN-8