def IxVmRefreshChassisTopologyPy(ixNet):
    ixNet.execute('ixVmRefreshChassisTopology')

me.
    # Usage: tiList = A list of Traffic Item names to stop.
    # Requires APIs: StopTrafficPy and VerifyTrafficStatePy
    if tiList:
        for item in ixNet.getList(ixNet.getRoot()+'traffic', 'trafficItem'):
            currentTrafficItemName = ixNet.getAttribute(item, '-name')
            if currentTrafficItemName in tiList:
                print '\nStopTraffic:', currentTrafficItemName
                ixNet.execute('stopStatelessTraffic', item)