It depends what you mean by 'support'.
Internally weathermap assumes everything is in bits/sec. Since it normally calculates the relative usage between the measured value and the maximum, it doesn't really matter what the units are, as long as they are the same. You only have to worry about it if you want to label the link with a traffic value instead of a percentage.
SNMP typically uses octet counters, so by default weathermap multiplies the value read from the target by 8 to get bits/sec, if it's an rrd file. This works with Cacti, mrtg and many others.
Are you sure you have a gigabyte interface? That's a very unusual size, outside of fibrechannel storage. But anyway, what you care about is what is stored in the rrd file that you use as a target with weathermap. Is that in bits/sec or bytes/sec? A good clue is if you had to use a special template in Cacti to add the graph - if you just used the default 'Network Interface', then you don't need to add any special treatment.
Also, if you have a redundant connection (i.e. failover, not load-sharing), then you still have an 8G max, not 16G.
_________________ Weathermap 0.98 is out! & QuickTree 1.0. Superlinks is over there now (and built-in to Cacti 1.x). Some Other Cacti tweaks, including strip-graphs, icons and snmp/netflow stuff. (Let me know if you have UK DevOps or Network Ops opportunities, too!)
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