Here is some debug info.
Thanks for the help.
/usr/local/rrdtool/bin/rrdtool graph - \
--imgformat=PNG \
--start=-86400 \
--end=-300 \
--title="1171.core - Smoke Ping" \
--base=1000 \
--height=120 \
--width=500 \
--upper-limit=10 \
--lower-limit=0 \
--units-exponent=1 \
--vertical-label="milliseconds" \
--slope-mode \
DEF:a="/var/www/html/cacti/rra/1171_core_min_796.rrd":avg:AVERAGE \
DEF:b="/var/www/html/cacti/rra/1171_core_min_796.rrd":max:AVERAGE \
DEF:c="/var/www/html/cacti/rra/1171_core_min_796.rrd":min:AVERAGE \
DEF:d="/var/www/html/cacti/rra/1171_core_min_796.rrd":loss:AVERAGE \
DEF:e="/var/www/html/cacti/rra/1171_core_min_796.rrd":max:MAX \
CDEF:cdefb=b,a,-,0.2,* \
CDEF:cdefh=a,g,-,0.2,* \
CDEF:cdefbc=e,0,* \
CDEF:cdefbd=bc,0,GT,UNKN,a,IF \
CDEF:cdefbe=bc,0,GT,bc,40,GT,UNKN,g,IF,UNKN,IF \
CDEF:cdefbf=bc,40,GT,bc,80,GT,UNKN,g,IF,UNKN,IF \
CDEF:cdefbg=bc,UN,1,EQ,TIME,300,+,NOW,GT,UNKN,INF,IF,bc,80,GT,INF,UNKN,IF,IF \
CDEF:cdefbh=d,UN,1,EQ,TIME,300,+,NOW,GT,100,0,IF,100,d,-,IF \
AREA:a#FFFFFF:"" \
AREA:cdefb#333333:"":STACK \
AREA:cdefb#555555:"":STACK \
AREA:cdefb#888888:"":STACK \
AREA:cdefb#AAAAAA:"":STACK \
AREA:cdefb#CCCCCC:"":STACK \
AREA:c#FFFFFF:"" \
AREA:cdefh#CCCCCC:"":STACK \
AREA:cdefh#AAAAAA:"":STACK \
AREA:cdefh#888888:"":STACK \
AREA:cdefh#555555:"":STACK \
AREA:cdefh#333333:"":STACK \
AREA:cdefbc#FFFFFF:"" \
LINE1:cdefbd#00CF00:"Up" \
AREA:cdefbe#4123A1:"Packet loss \: 1 -> 40 %" \
AREA:cdefbf#8F005C:"Packet loss 41 -> 80 %" \
AREA:cdefbg#FF0000:"Down\n" \
GPRINT:cdefbh:AVERAGE:"Success rate \:%8.2lf %%\n" \
COMMENT:"Response time \:" \
GPRINT:c:MIN:"Minimum \:%8.2lf ms" \
GPRINT
AVERAGE:"Average \:%8.2lf ms" \GPRINT:e:MAX:"Maximum \:%8.2lf ms\n"
RRDTool Says:
ERROR: invalid rpn expression in: a,g,-,0.2,*