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My guess is that when your router was reloaded, it reenumerated the interfaces.
If you build your MRTG cfg files using the ifref as the unique identifier, then a reload can change the ifref causing this behaviour.
The better way it to use the interface IP, or interface name, as the unique identifier as this can remain constant over a reload.
If you are using cfgmaker to generate your cfg files, and have MRTG 2.16.4, look at the --ifref=ip,name,nr option (in prior versions, you can only specify a single option to --ifref )
_________________ 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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