Installation Manual

IBRInstallationGuide
 Page27of40 Doc#770‐00001‐13
 Sept.21,2014
IBRsupportsSNMPgetstatementsforSNMPv2‐MIB,IF‐MIB,andFBN‐RADIO‐MIB.Detailedinformationfor
configuringSNMPiscontainedintheCLIGuide.
7.5 Switching&Transport
IBRsupports802.1Q(VLAN).
7.6 DataHandling
IBRsupportsthefollowingOSI
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Layer2standards:
 IEEE802.3ab(GigabitEthernet);
 IEEE802.3as(frameexpansion);
 IEEE802.1Q(VLANs).
Inaddition,IBRsupportsportmirroringtomonitorporttraffic.
7.7 CarrierEthernet
IBRconformstothefollowingMEF
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specifications:
 MEF9–AbstractTestSuiteforEthernetServicesattheUNI
 MEF14–AbstractTestSuiteforTrafficManagementPhase1
 MEF19–AbstractTestSuiteforUNIType1
7.8 Timing&Synchronization
IBR’ssystemclockstartswhenIBRispoweredupandmaintainstimeanddatebasedonUniversalTime
Coordinated(UTC),alsoknownasGreenwichMeanTime(GMT).Thesystemclockcanbesetoverthe
networkviaNTP.
DetailedinstructionsforconfiguringIBRtimingandfordisplayingsystemtimeanddatearecontainedinthe
CLIGuide.
7.9 NetworkTimeProtocol(NTP)
NTPrunsoverUserDatagramProtocol(UDP),whichrunsoverIP.Itisveryefficientandtypicallyrequires
nomorethanoneNTPpacketperminutetosynchronizeIBR’ssystemclocktowithinonemillisecondofthe
NTPserver’sclock.
WhenIBRisconfiguredtoreceiveNTPpacketsfromanothernetworkdevice,therelationshipbetweenIBR
andthatdeviceiscalledan“association”anditisaserverrelationship,meaningthatIBRwillsynchronizeto
theotherdevice(the“server”)andtheotherdevicewillnotsynchronizetoIBR.
Bydefault,NTPisdisabledonIBR,noNTPassociationsaredefined,andtheNTPdaemonisnotrunning.
ProceduresforenablingandconfiguringNTParecontainedintheCLIGuide.
WhenIBRisrunningNTP,IBRcanbeassociatedwithmorethanoneNTPserver.Normally,IBRwill
synchronizetotheassociatedNTPserverthathastheloweststratumnumber;thatisthelowestnumberof
hopsbetweentheserveranditsclocksource.Astratum1timeserverhasaradiooratomicclockdirectly
attached,astratum2timeserverreceivesitstimethroughNTPfromastratum1timeserver,etc.
IBRwillavoidsynchronizingtoaserverwhosetimemightnothavebeensynchronizedortoonewhosetime
issignificantlydifferentthanthetimefromotherassociatedservers,evenifitsstratumislower.
WhenNTPisenabledonIBR,NTPtimewilltakeprecedenceovertimeprovidedbyanyothersourceor
method.
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Open Systems Interconnection
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Metro Ethernet Forum