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If your .rrd file is of double length, and you have extendedtime enabled in the routers2.conf, then you will get additional time options 'yesterday', 'last week', 'last month' and 'last year'.
This will not let you see two years on a single graph, but you can click 'last year' to see the previous year's data.
You need to have at least 800 data points in your .rrd file though - current versions of RRDTool do this by default but earlier ones would only store 400 by default. You can also use the rrdextend script (with routers2) to add extra points, or the RRDRowCount option in the MRTG .cfg file (before the .rrd is created).
The routers2 Verify page will tell you if your .rrd files are extended-time capable.
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Steve Shipway
UNIX Systems, ITSS, University of Auckland, NZ
Woe unto them that rise up early in the morning... -- Isaiah 5:11
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