Radwin Transportation FiberinMotion - Wayside Core Router; Basic IP Scheme and Data Flow Path

FinMDeploymentGuide Release4.5.10 3‐5
WaysideCoreRouter NetworkGuidelines
3.6WaysideCoreRouter
ThewaysidenetworkrequiresacorerouterthatwillactasthegatewaybetweentheTrain‐
To‐Groundsystemandtheclient'scorenetwork.Alltrafficbetweenanytrain'son‐board
devicesandtheclient'scorenetworkmustpassthroughthisrouter.Thewaysidecorerouter
musthaveatleast2interfaces(seediagrambelowinSection3.7):
Interface1: Connectstotheclient'scorenetwork.Itwillbeonthesamesubnetasthe
client'snetworkandwillbethegatewayforalltrafficfromtheclientnetwork
targetedatdevicesonboardtrains.
Interface2: UsedfortheTrain‐To‐Groundnetwork.Itwillbeonthesamesubnetastheon‐
boardrouterinterface1andwillbethegatewayforalltrafficfromtheon‐
boardroutersonallthetrains.
Alltrafficbetweenanyon‐boarddeviceandthetracksidemustpassthroughtheon‐board
router.
3.7BasicIPSchemeandDataFlowPath
AnexampleofthebasicIPschemeisshownhere.
Thetrafficflowsbetweenthewaysidecorerouterandtheon‐boardrouter.Allelements
betweentherouters(includingswitchesandFiberinMotionradios)arepureL2devices.They
haveanIPaddressformanagementonly,andaretransparenttothedatatraffic.
Overall,atleast3IPsubnetsarerequired:
• SubnetAfortheclientcorenetwork.
• SubnetBforthetraintogroundsegment.
• SubnetCfortheon‐boardnetwork.
IfworkingwithaVLAN,seeRecommendedVLANAssignmentonpage 3‐7.