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- Private_Network-to-Network_Interface abstract "The Private Network-to-Network Interface (PNNI) is a link-state routing protocol used in ATM networks. PNNI is similar to the open shortest path first (OSPF) used for IP routing.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. PNNI is a link-state routing 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. The PNNI protocol communicates the state of a PNNI network in PNNI Topology State Elements (PTSEs). PTSEs are discrete messages that contain information about one of the following types of network components:PNNI nodesReachable addressesPNNI links between nodesTo enable communications with other nodes, each switch needs to have all the PTSE information for each switch in the network. Each node is responsible for flooding out its own PTSE information to all the other switches in the network.Since up-to-date PTSE information is required for optimal routing decisions to be made, there are several different mechanisms in place to help ensure that all nodes have reasonably accurate PTSE information. The five common reasons for updating PTSEs are as follows:Resources administratively added, removed or altered on a node.Resource failure such as an Loss of Signal (LOS) on a link.A significant change in link resources due to virtual circuits (VCs) routing or derouting.Periodic updates defined by the PTSE refresh and PTSE lifetime interval timers.A processor switch module (PXM) switchover.PTSE information is passed between nodes using PNNI Topology State Packets (PTSPs). These packets utilize the Routing Control Channel (RCC; VPI = 0 and VCI = 18) between adjacent nodes. The RCC is also used for Hello packets and other PNNI messages. If the switch is unable to establish the RCC with the adjacent node, then PTSE information is not exchanged. Once a node receives PTSE information, the node stores the contents, or element information, in the database. This information is used to generate precomputed routing tables that identify routes to other network devices. PNNI uses the Dijkstra's algorithm for SPF calculation. The PNNI database is also used to perform on-demand routing when the appropriate routing table does not contain a viable path.PNNI measures line capacities and delays in addition to simple cost metrics.".
- Private_Network-to-Network_Interface wikiPageExternalLink pintro.html.
- Private_Network-to-Network_Interface wikiPageID "22426910".
- Private_Network-to-Network_Interface wikiPageRevisionID "551851837".
- Private_Network-to-Network_Interface hasPhotoCollection Private_Network-to-Network_Interface.
- Private_Network-to-Network_Interface subject Category:ITU-T_recommendations.
- Private_Network-to-Network_Interface subject Category:Networking_standards.
- Private_Network-to-Network_Interface subject Category:Routing_protocols.
- Private_Network-to-Network_Interface type Abstraction100002137.
- Private_Network-to-Network_Interface type Advice106671484.
- Private_Network-to-Network_Interface type Communication100033020.
- Private_Network-to-Network_Interface type Direction106786629.
- Private_Network-to-Network_Interface type ITU-TRecommendations.
- Private_Network-to-Network_Interface type Measure100033615.
- Private_Network-to-Network_Interface type Message106598915.
- Private_Network-to-Network_Interface type NetworkingStandards.
- Private_Network-to-Network_Interface type Proposal107162194.
- Private_Network-to-Network_Interface type Protocol106665108.
- Private_Network-to-Network_Interface type Recommendation106671637.
- Private_Network-to-Network_Interface type RoutingProtocols.
- Private_Network-to-Network_Interface type Rule106652242.
- Private_Network-to-Network_Interface type Standard107260623.
- Private_Network-to-Network_Interface type SystemOfMeasurement113577171.
- Private_Network-to-Network_Interface comment "The Private Network-to-Network Interface (PNNI) is a link-state routing protocol used in ATM networks. PNNI is similar to the open shortest path first (OSPF) used for IP routing.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.".
- Private_Network-to-Network_Interface label "PNNI".
- Private_Network-to-Network_Interface label "PNNI".
- Private_Network-to-Network_Interface label "Private Network-to-Network Interface".
- Private_Network-to-Network_Interface sameAs PNNI.
- Private_Network-to-Network_Interface sameAs m.05zxny9.
- Private_Network-to-Network_Interface sameAs Q3888133.
- Private_Network-to-Network_Interface sameAs Q3888133.
- Private_Network-to-Network_Interface sameAs Private_Network-to-Network_Interface.
- Private_Network-to-Network_Interface wasDerivedFrom Private_Network-to-Network_Interface?oldid=551851837.
- Private_Network-to-Network_Interface isPrimaryTopicOf Private_Network-to-Network_Interface.