I noticed that with 6.0 r13 that this was resolved and with the official release of 6.0 I had zero issues. When I upgraded to 6.1 every time I reboot my router (RB450G on firmware 3.07) my bandwidth graphs are wiped clean with the exception of the year to date graph. Is this a known bug being looked at, or should I try reinstalling 6.1 again? I’m starting to consider to rolling back to 6.0, but I wanted to see if this is a known issue for 6.1 and/or see if there is a work around. Thanks in advance 
There are lots of bugs with 6.1.
Please send this problem directly to support@mikrotik.com so they can check it out.
AKJP, you are not alone. I am seeing this on two different RB433 routers I look after, both running 6.1. Every time I reboot the graphs get cleared (or at least history back to when I updated to 6.x; early history from the 5.x days lives). Didn’t see this when I was running 5.x on those units. Yes I have confirmed that interface graph data is stored to disk.
I see the same issue. I was running 6.0, upgraded to 6.2 and all the history on all the interface graphs is lost back to when I was running 5.x. When upgrading to 6.0 from one of the 6.0 RC builds the same thing happened…all the 6.0rcxx history was lost and only the 5.x history remains. This has been around for a long time…I’m using a RB2011
can you use EOIP as a tunnel?
broadcast traffic can send via EOIP tunnel very simple and suitable.