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You should get it automatically per device.
You will get an 'Incoming' and 'Outgoing' graph which combine incoming and outgoing for all the interafces.
You will also get a summary page for that device with all sub-graphs (you can add the 'active' keyword to suppress ones with no data over zero).
If you want a summary page over multiple devices then you can do it by creating a dummy cfg file. This file should use Include: to include the others, then then use 'routers.cgi*InMenu[_]:no' optionally to suppress the entries of the subgraphs from appearing in the side menu. Use 'routers.cgi*InSummary[_]:yes' to make all graphs default to being in the summary page.
Note that this summary page could get very big. If it does, it will take a long time to generate.
_________________ 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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