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Extreme Networks Data Sheet: Summit X450a Series

Voice-Class Availability

a system reboot. Summit X450a provides the high network availability required for converged applications.

Software-Enhanced Availability

Software-enhancedavailabilityallowsuserstoremaincon-

nectedtothenetworkevenifpartofthenetworkinfrastructure

isdown.TheSummitX450aseriescontinuouslychecksfor

problemsintheuplinkconnectionsusingadvancedLayer3

protocolssuchasOSPF,VRRPandExtremeStandbyRouter

Protocol™(ESRP,supportedinLayer2orLayer3),anddynami-

callyroutestracaroundtheproblem.

Equal Cost Multipath

EqualCostMultipath(ECMP)routingallowsuplinkstobeload

balancedforperformanceandcostsavingswhilealsosupport-

ingredundantfailover.Ifanuplinkfails,tracisautomatically

routedtotheremaininguplinksandconnectivityismaintained.

Link Aggregation (802.3ad)

Linkaggregationallowstrunkingofuptoeightlinksonasingle

logicalconnection,forupto20GigabitsperSecond(Gbps)of

redundantbandwidthperlogicalconnection.

Multi-Switch LAG (M-LAG)

M-LAGcanaddressbandwidthlimitationsandimprove

networkresiliency,inpartbyroutingnetworktracaround

bottlenecks,reducingtherisksofasinglepointoffailure,and

allowingloadbalancingacrossmultipleswitches.

Voice-Grade Stacking with

SummitStack

TheSummitX450aseriesoersdualstackinginterfacesto

providehigh-speed40Gbpsstackingbandwidth.SummitStack

stackingarchitectureisdesignedtosupportconvergedservices

suchasVoIPandvideobyitshighlyavailable,rapidfailover

capabilitywithn-1masterredundancy,distributedLayer2and

Layer3switching,linkaggregationacrossthestackand

distributeduplinks.The40GbpsSummitStacksupportsupto

eightunitsinastack,includinganymixofSummitX460,X480,

X650,X450a,X450e,andX250erunningthesameversionof

ExtremeXOS.Itprovidessub-secondfailoverforpathfailure

andhitlessmaster/backupfailoveralongwithhitlessprotocol

supportsuchasOSPFgracefulrestartandNetworkLoginuser

authentication.TheSummitX450aswitchprovideschassis-like

managementandavailabilitywithitsSummitStackstacking

technology(seeFigure2).

Modular Operating System for

Non-Stop Operation

Preemptive Multitasking and Protected

Memory

TheSummitX450aseriesswitchallowseachofmanyapplica-

tions—suchasOpenShortestPathFirst(OSPF)andSpanning

TreeProtocol(STP)—torunasseparateOSprocessesthatare

protectedfromeachother.Thisdrivesincreasedsystem

integrityandinherentlyprotectsagainstDoSattacks.

Process Monitoring and Restart

ExtremeXOSdramaticallyincreasesnetworkavailabilityusing

processmonitoringandrestart.EachindependentOSprocess

ismonitoredinrealtime.Ifaprocessbecomesunresponsiveor

stopsrunning,itcanbeautomaticallyrestarted.

Loadable Software Modules

ThemodulardesignofExtremeXOSallowstheupgradingof

individualsoftwaremodules,shouldthisbenecessary,leading

tohigheravailabilityinthenetwork(seeFigure1).

High Availability Network Protocols

Ethernet Automatic Protection Switching

(EAPS)

EAPSallowstheIPnetworktoprovidethelevelofresiliency

anduptimethatusersexpectfromtheirtraditionalvoice

network.EAPSismoreadaptablethanSpanningTreeorRapid

SpanningTreeprotocolsandoerssub-second(lessthan50

milliseconds)recoverythatdeliversconsistentfailoverregard-

lessofthenumberofVLANs,networknodesornetwork

topology.SinceEAPSallowsthenetworktorecoveralmost

transparently,Voice-over-IPcallswillnotdropanddigitalvideo

feedswillnotfreezeorpixelizeinmostsituations.

Spanning Tree/Rapid Spanning Tree

Protocols

TheSummitX450aseriessupportsSpanningTree(802.1D),Per

VLANSpanningTree(PVST+),RapidSpanningTree(802.1w)

andMultipleInstancesofSpanningTree(802.1s)protocolsfor

Layer2resiliency.

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