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ADTRAN Total Access 5000 - TWAMP Provisioning; TWAMP Connection Setup; TWAMP Test Session Setup; TWAMP Overview

ADTRAN Total Access 5000
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Total Access 5000 Business Services Deployment Guide
D-2 65K510DEP08-1A
TWAMP Overview
TWAMPî ±isî ±aî ±mechanismî ±byî ±whichî ±IPî ±performanceî ±metricsî ±andî ±packetî ±lossî ±canî ±beî ±obtainedî ±
acrossî ±theî ±Metroî ±Ethernet.î ±Theseî ±typesî ±ofî ±metricsî ±verifyî ±thatî ±aî ±certainî ±serviceî ±levelî ±isî ±being î ±metî ±
acrossî ±theî ±networkî ±thatî ±wasî ±agreedî ±uponî ±betweenî ±theî ±customerî ±andî ±theî ±serviceî ±provider.
TWAMPî ±allowsî ±aî ±unitî ±inî ±
theî ±Metroî ±Ethernetî ±toî ±setî ±upî ±and î ±sendî ±IP î ±packetsî ±toî ±aî ±destinationî ±unitî ±
inî ±theî ±Metroî ±Ethernet.î ±Theî ±destinationî ±unitî ±receivesî ±theî ±packetî ±andî ±transmitsî ±itî ±rightî ±backî ±toî ±
theî ±sendingî ±unit.î ±Theî ±packetî ±containsî ±timestampsî ±insertedî ±byî ±theî ±sendingî ±andî ±destinationî ±
unitsî ±thatî ±indicateî ±sendingî ±time,î ±timeî ±receivedî ±and
re‐transmittedat thedestination unit,and
theî ±timeî ±receivedî ±backî ±atî ±theî ±sendingî ±unit.î ±Withî ±thisî ±information,î ±theî ±sendingî ±unitî ±canî ±
calculatethefollowingstatistics:packetloss,two‐wayla tency,anddirectional/one‐wayjitter.
NOTE
Theî ±NCTEî ±onlyî ±supportsî ±reflectorî ±mode.
TWAMP Provisioning
Inî ±TWAMPî ±terminology,î ±theî ±sourceî ±nodeî ±orî ±senderî ±isî ±calledî ±theî ±Êșses si o n ‐senderÊșî ±andî ±theî ±
reflectorî ±isî ±simplyî ±calledî ±theî ±Êșses si o n ‐reflectorÊș.î ±Inî ±addition,î ±theî ±sourceî ±nodeî ±usuallyî ±hasî ±theî ±
responsibilityofinitiallyrequestingaTWAMPsessiontocommence.InTWAMPterminology
thisî ±isî ±calledî ±theî ±ÊșControl‐ClientÊș‐sometimesî ±just
abbreviatedtoclient.Thereflectornode
alsoî ±hasî ±anotherî ±roleî ±ofî ±beingî ±theî ±TWAMPî ±ÊșserverÊș.Theî ±ÊșserverÊșî ±isî ±responsibleî ±forî ±acceptingî ±
theî ±TWAMPî ±requestsî ±fromî ±theî ±sourceî ±node.
TheTWAMPprotocolcanbedividedupintothe4logicalstates.Eachphasecommences
sequentiallyî ±inî ±timeî ±inî ±aî ±normalî ±TWAMP
î ±probeî ±exchange:
‱Theî ±connectionî ±setupî ±phaseî ±(runî ±overî ±TCP)
‱Theî ±testî ±sessionî ±setupî ±phaseî ±(runî ±overî ±TCP)
‱Theî ±activeî ±testî ±sessionî ±phaseî ±(runî ±overî ±UDP)
‱Theî ±testî ±sessionî ±endî ±andî ±pmî ±retrievalî ±phaseî ±(runî ±overî ±TCP)
NOTE
Theî ±activeî ±testî ±se ssion î ±phaseî ±runsî ±overî ±UDP,î ±whereasî ±theî ±otherî ±3î ±phasesî ±all
runî ±overî ±aî ±singleî ±TCPî ±connection.î ±
TWAMP Connection Setup
Thehostthatinitiatesthetcpconnectiontakestheroleofcontrol‐clientandsessionsender.
ThehostthatacknowledgestheTCPconnectionisthesession‐reflector.
TWAMP Test Session Setup
Thesession‐reflectordoesNOTprocessincomingtestpacketsforPMmetricsanddoesnot
careaboutthesendschedule.Consequently,thenumberofscheduledslotsandnumberof
packetsintherequest‐sessioncommandmustbesetto0.
SenderUDPportistheUDPportusedforsendertransmission.
Receiverî ±UDPî ±portî ±isî ±theî ±UDPî ±
portî ±usedî ±forî ±reflectorî ±transmission.

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