PDF user manual for CopperEdge 150

9:$11HWPRGHOWith this netmodel, subscriber links act as wide-area extensionsof a remote LAN or other private network. Packets can beexchanged over an ATM or Frame Relay virtual circuit or, asMAC PDUs, over the CE150’s Ethernet port. VWAN is a layer 2LAN extension to an upstream router.The VWAN netmodel requires an upstream IRB router, allowingthe CE150 and the router together to function as a virtualbridge. Hosts on the LANs on the downstream side of the CPEsbecome remote or wide-area extensions of a private LAN on theupstream side of the router.1 2 7 (Enabling VWAN in the CE150 depends on a specific operating mode ofcertain routers called Integrated Router/Bridge or IRB. Routers withoutthis capability may not be suitable for use in VWAN applications.The VWAN netmodel allows you to link a single DSL line to asingle virtual bridge (WAN VC or Ethernet) in point-to-pointmode, or aggregate many DSL links into a single virtual bridge,provided they all have the same DestPII; that is, provided theyare served by a common circuit (WAN VC or Ethernet) on a commonWAN (or Ethernet) interface linked to a common bridgegroup on a distant IRB router.Each CE150 can support as many virtual bridge groups as it canvirtual circuits, each connecting to a different far-end terminalpoint. Each bridge group, in such a case, must be associated withone DLCI or ATM Virtual Link number (or with the Ethernet port).PortlandAtlantaDivision HeadquartersWiring ClosetWANCorporate HeadquartersRemote-Site LANDSL Link 1DSL Link nFrame Relay PVCPublicNetworkSub-InterfacePVCIRB-Capable RouterBridgeGroup 1BridgeVirtualInterfaceRouterFunctionCorporateLANVWAN Network Model&KDSWHU$GYDQFHG&RQILJXUDWLRQ