Specifies the type of 'bandwidth' label shown on each link.

The default is 'percent', but you can also have 'none', 'unformatted' or 'bits'. 'bits' shows the actual bandwidth, formatted using K,M,T,G suffixes where appropriate. 'unformatted' takes the value from the TARGET and displays it without any formatting - this can be useful for mapping things other than bandwidth. 'none' hides the bandwidth label altogether.