Cisco Systems Network Router Soft Rerouting, Priority Bumping, Blocking Pass-Through Connections

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Chapter 4 Planning Intermediate Route Selection

Additional Routing Features in MGX and SES Nodes

The grooming feature can be implemented at any time. Grooming is not configured at the same time as connections, so there is no penalty if you do not include grooming in the initial plan for a PNNI network.

Soft Rerouting

The soft reroute feature is new in Release 5 and minimizes reroute times by establishing a new connection before releasing the rerouted connection. This feature requires no prior planning and can be implemented at any time. For more information, refer to the Cisco MGX 8850 (PXM1E/PXM45), Cisco MGX 8950, Cisco MGX 8830, and Cisco MGX 8880 Configuration Guide, Release 5.

Priority Bumping

Priority bumping is a new feature in Release 5.0. When enabled, priority bumping can be used to release lower priority connections to make room for an incoming, higher priority connection.

The priority bumping feature can be implemented at any time. However, the routing priority used for priority bumping is the same as used for priority routing. Because the routing priority is configured while creating and configuring connections, you might want to review the priority bumping feature details before configuring connections and interfaces. You can find more information on priority bumping in the Cisco MGX 8850 (PXM1E/PXM45), Cisco MGX 8950, Cisco MGX 8830, and Cisco MGX 8880 Configuration Guide, Release 5.

Blocking Pass-Through Connections

As a switch administrator, you can configure MGX and SES nodes to support or deny connections that pass through the node. If you chose to deny transit or pass-through connections, the node will only accept calls that terminate on one of the node’s interfaces. Other nodes will not be able to establish routes through the blocked node to other nodes. This feature is called the Nodal Transit Restriction feature.

Nodal Point-to-Multipoint Branch Restriction

The point-to-multipoint (P2MP) feature enables select Cisco MGX switches to support PNNI network applications such as data and video broadcast and LAN emulation. P2MP branching is a feature that allows a switch to accept one incoming connection and produce multiple outgoing connections. This enables basic P2MP connectivity. For the nodes that support P2MP branching, branching can be enabled or disabled.

Note Cisco SES equipped BPX switches can serve as the source or destination of a P2MP connection, but these switches cannot perform branching.

Figure 4-1shows the data flow in a P2MP connection and introduces the root, leaf, and party terms, which apply to the interfaces that support P2MP connections.

 

 

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

 

 

 

 

 

 

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

 

 

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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 Audience ObjectivesOrganization Xii ConventionsXiii DocumentationDocumentation Notes for the April 2004 Product Releases Related DocumentationXiv Technical Manual Order of UseTerms Technical Manual Titles and DescriptionsXvi Xvii Xviii Xix Reference Guides Xxi Xxii Document Title DescriptionXxiii Xxiv Xxv Xxvi Xxvii Obtaining DocumentationCisco.com Ordering DocumentationChapter Changes Changes to This DocumentXxviii Opening a TAC Case Obtaining Technical AssistanceDocumentation Feedback Cisco TAC WebsiteTAC Case Priority Definitions Obtaining Additional Publications and InformationXxx 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 RepresentationBorder Nodes Pnni Internetworking with AiniHierarchical Pnni Network Benefits Example Pnni Internetworking with Aini Topology Pnni Internetworking with IispPart Number OL-3847-01 Rev. D0, April Compatible Standards SpecificationsPXM45/B PXM45Capabilities PXM1ESES Capabilities SESDAX Spvc Connection Limit AdjustmentsConnection Type Switch Connections CWM Endpoints SVCParallel Links Between Adjacent Switches Install Redundant Hardware in SwitchesPhysical Network Planning Multiple Paths Between Network Nodes Planning Guidelines for Individual Peer GroupsMultiple Links Between Adjacent Peer Groups Multiple Links to an External NetworkPlanning Guidelines for Peer Group Leaders Planning Guidelines for Hierarchical NetworksPlanning 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 ValuesDCC Selecting a Pnni LevelAddress Registration Authorities Category Type Authorities4shows 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 Spvc Address Prefix Selecting the Ilmi 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 OverviewSelecting an Interlock Code Planning CUG Configuration SettingsSelecting 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 How MGX and SES Nodes Select Routes Administrative WeightLink and Route Metrics Cell Delay Variation Cell Transfer DelayAvailable Cell Rate Maximum Cell Rate Shortest Path Table RoutingShortest Path Tables Traffic Metric Class of Service TablesService Class Acronym Definition Guidelines CTD CDVHow SPVCs and SPVPs use the SPTs How SVCs and SVPs use the SPTsOn-Demand Routing How MGX and SES Nodes Select LinksLoad Balancing for SPT and On-Demand Routing CLR0+12 Additional Routing Features in MGX and SES NodesService Preferred RoutingGrooming Priority RoutingNodal Point-to-Multipoint Branch Restriction Soft ReroutingPriority Bumping Blocking Pass-Through ConnectionsAXSM-XG AXSM/AAXSM/B AXSM-EFarthest Node Branching Part Number OL-3847-01 Rev. D0, April Ansi APS ABRAesa AiniIN-2 P2MPCBR CTDIN-3 CUGCWM DININ-4 IN-5 PGLPnni MGX SESIN-6 IN-7 UBRUNI TACIN-8
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