Graph printed wrong way

[casinamu]

Does anybody know why the outbound graph I posted was printed wrong way
when it reach near 150M? Please give me some advices.

Thanks you

[gandalf]

It is very likely, that the graph is capped as 114 Mbps. This is a COUNTER overflow on 32 but COUNTERs.
Please use 64 bit COUNTERs instead. This requires support by the target device for those and includes the use of SNMP V2c.
There has been a plugin to switch from 32 bit to 64 bit COUNTER graphs
R.