Cisco Systems Network Router Selecting the Ilmi Address Prefix, Selecting the Spvc Address Prefix

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Chapter 3 Address and Closed User Group Planning

Planning Address Configuration Settings

Selecting the ILMI Address Prefix

Although ILMI is not part of the PNNI specification, ILMI addressing should be coordinated with PNNI addressing to minimize the number of PNNI advertised ATM addresses. The Cisco MGX and SES switch products support ILMI dynamic addressing on UNI ports. When dynamic addressing is enabled, one or more ILMI prefixes can be used to generate ATM addresses for CPE as follows:

1.The CPE retrieves the 13-byte ILMI prefix from the switch.

2.The CPE appends its 7 bytes with the 13-byte prefix to form its AESA.

3.The ILMI running on the switch registers the constructed AESA on the switch.

The default ILMI prefix is the first 13-bytes of the default ATM address, which consists of the 7-byte peer group ID (0x47 0091 8100 0000) plus the unique 6-byte MAC address. If you change the peer group ID for the switch, you should also change the ILMI address prefix so that the bytes that correspond to the peer group ID match the corresponding bytes in the ILMI prefix.

When ILMI is enabled on a UNI port, you can add up to 16 address prefixes for that port. The same ILMI prefix can be assigned to multiple ports. These ILMI prefixes are advertised by PNNI to enable switched virtual circuit (SVC) routing to CPE that use these prefixes.

Enter the ILMI prefixes you plan to use into the Port Address Worksheet, Table 3-5, which appears at the end of this chapter.

Selecting the SPVC Address Prefix

If you set up soft permanent virtual connections (SPVCs), the port at each end of the connection must have a globally unique SPVC address. This address is generated by the switch when the connection is defined and consists of the SPVC prefix and an internally generated number that identifies the port.

The default SPVC prefix is the first 13-bytes of the default ATM address, which consists of the 7-byte peer group ID (0x47 0091 8100 0000) plus the unique 6-byte MAC address. If you change the peer group ID for the switch, you should also change the SPVC address prefix so that the bytes that correspond to the peer group ID match the corresponding bytes in the SPVC prefix.

When planning the SPVC prefix for your WAN, consider the following:

•The SPVC prefix and the ILMI prefix can be the same, or they can be different.

•There can be just one SPVC prefix for each node.

•Once you create a connection using an SPVC prefix, you cannot change the SPVC prefix until all SPVCs have been deleted.

Enter the SPVC prefix into the Nodal Address Worksheet, Table 3-4, which appears at the end of this chapter.

Planning Address Prefixes for AINI and IISP Links

ATM Inter-Network Interface (AINI) and Interim Inter-Switch Protocol (IISP) are two protocols that are used for connecting private PNNI networks to public PNNI networks or to other private PNNI networks. These links enable communications between separately managed networks without exposing the internal structure of each independent network to the other. For example, when an AINI or IISP link is properly configured, a CPE on one independent network can communicate with a CPE on another independent network. However, PTSEs are not transmitted across these links, so the independent networks only have access to ATM addresses that are deliberately shared during configuration.

 

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

3-12

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

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Contents Corporate Headquarters Text Part Number OL-3847-01 Rev. D0Copyright 2003, Cisco Systems, Inc All rights reserved N T E N T S IiiCompatible Standards Worksheets Part Number OL-3847-01 Rev. D0, April G U R E S ViiViii B L E S Part Number OL-3847-01 Rev. D0, April Organization ObjectivesAudience Conventions XiiRelated Documentation DocumentationDocumentation Notes for the April 2004 Product Releases XiiiTechnical Manual Order of Use XivTechnical Manual Titles and Descriptions TermsXvi Xvii Xviii Xix Reference Guides Xxi Document Title Description XxiiXxiii Xxiv Xxv Xxvi Ordering Documentation Obtaining DocumentationCisco.com XxviiXxviii Changes to This DocumentChapter Changes Cisco TAC Website Obtaining Technical AssistanceDocumentation Feedback Opening a TAC CaseXxx Obtaining Additional Publications and InformationTAC Case Priority Definitions Xxxi Xxxii Introduction to Pnni Pnni Network DatabaseSingle Peer Group Topology Hierarchical Pnni Network Topology Example Single Peer Group TopologyPeer group Ppeer Peer Group Leaders Simple Node RepresentationComplex Node Representation Simple Node RepresentationHierarchical Pnni Network Benefits Pnni Internetworking with AiniBorder Nodes Pnni Internetworking with Iisp Example Pnni Internetworking with Aini TopologyPart Number OL-3847-01 Rev. D0, April Specifications Compatible StandardsPXM1E PXM45Capabilities PXM45/BCapabilities SES SESSVC Connection Limit AdjustmentsConnection Type Switch Connections CWM Endpoints DAX SpvcPhysical Network Planning Install Redundant Hardware in SwitchesParallel Links Between Adjacent Switches Multiple Links to an External Network Planning Guidelines for Individual Peer GroupsMultiple Links Between Adjacent Peer Groups Multiple Paths Between Network NodesPlanning Guidelines for Border Nodes Planning Guidelines for Hierarchical NetworksPlanning Guidelines for Peer Group Leaders Part Number OL-3847-01 Rev. D0, April Address and Closed User Group Planning Address Planning OverviewPnni Addressing Example Planning Address Configuration Settings Selecting an ATM Address FormatSupported Address Formats ESI SEL IDP DSPATM Field Description Default Values Guidelines for Selecting an Address FormatCategory Type Authorities Selecting a Pnni LevelAddress Registration Authorities DCC4shows an example topology of a Pnni MPG WAN Part Number OL-3847-01 Rev. D0, April Length Level Peer Group ID Portion of ATM Address BytesDefault Peer Group ID Selecting the Pnni Peer Group IDSelecting the ATM Address 20-byte Node AddressPlanning Address Prefixes for Aini and Iisp Links Selecting the Ilmi Address PrefixSelecting the Spvc Address Prefix Selecting Static Addresses for UNI Ports Additional Guidelines for Creating an Address PlanClosed User Group Overview Closed User Group ExampleSelecting an Index Planning CUG Configuration SettingsSelecting an Interlock Code Selecting Internal CUG Access Options Selecting CPE AddressesSelecting External CUG Access Options Specifying a Preferential CUGSelecting a Default CUG Address WorksheetsCUG Part Number OL-3847-01 Rev. D0, April Link and Route Metrics Administrative WeightHow MGX and SES Nodes Select Routes Available Cell Rate Cell Transfer DelayCell Delay Variation Shortest Path Tables Shortest Path Table RoutingMaximum Cell Rate CTD CDV Class of Service TablesService Class Acronym Definition Guidelines Traffic MetricHow SVCs and SVPs use the SPTs How SPVCs and SPVPs use the SPTsLoad Balancing for SPT and On-Demand Routing How MGX and SES Nodes Select LinksOn-Demand Routing Preferred Routing Additional Routing Features in MGX and SES NodesService CLR0+12Priority Routing GroomingBlocking Pass-Through Connections Soft ReroutingPriority Bumping Nodal Point-to-Multipoint Branch RestrictionAXSM-E AXSM/AAXSM/B AXSM-XGFarthest Node Branching Part Number OL-3847-01 Rev. D0, April Aini ABRAesa Ansi APSCTD P2MPCBR IN-2DIN CUGCWM IN-3IN-4 MGX SES PGLPnni IN-5IN-6 TAC UBRUNI IN-7IN-8
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