proc GetTrafficItemObjects {{trafficItemName None}} {
    # Get the Traffic Item objects: trafficItemObj, configElementObj and endpointSetObj
    #    - trafficItemObj: Configures bi-directional traffic, tracking, one-to-one meshing.
    #    - configElement:  Configures frameSizes, lineRate
    #    - endpointSetObj: The source/dest endpoints and name
    #
    # Parameter
    #    trafficItemName: Provide a traffic item name to look for. This is optional.
    #                     If no traffic item name is specified, then return the 
    #                     first trafficItemObj, configElementObj and endpointSetObj.

    set trafficItemObjList [ixNet getList [ixNet getRoot]/traffic trafficItem]
    foreach trafficItemObj $trafficItemObjList {
	set trafficItemObjName [ixNet getAttribute $trafficItemObj -name]
	set configElementObj [ixNet getList $trafficItemObj configElement]
	set endpointSetObj [ixNet getList $trafficItemObj endpointSet]

	if {$trafficItemName != "None" && $trafficItemName == $trafficItemObjName} {
	    return [list $trafficItemObj $configElementObj $endpointSetObj]
	}
	if {$trafficItemName == "None"} {
	    # If user did not specify which Traffic Item object to get by a name, 
	    # return the first objects
	    return [list $trafficItemObj $configElementObj $endpointSetObj]
	}
    }
    puts "\nError: GetTrafficItemObjects: No traffic item name found in configuration: $trafficItemName"
    return 0
}