Ok , in fact i am just beginning to understand how to manage Cacti i guess...
I was confused between : Data Sources,Graph Management,Graph Tree,Data Queries etc....
I am pretty sure that the problem is linked to CPU graph for the distant device (the cisco).
I said i had a link with nothing inside (for cpu) when seeing my trees , that was because i had deleted or i hadn't Data Source for the CPU graph.
That's why i now added in "Data Sources" a "CPU usage Nice" that i added to "1er_equipement - CPU Usage" and the result is this blank graph at the bottom of my post.
Then let's try to get more informations concerning "1er_equipement_cpu_nice_37.rrd" :
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rrdtool info 1er_equipement_cpu_nice_37.rrd
filename = "1er_equipement_cpu_nice_37.rrd"
rrd_version = "0003"
step = 300
last_update = 1357998001
header_size = 1888
ds[cpu_nice].index = 0
ds[cpu_nice].type = "COUNTER"
ds[cpu_nice].minimal_heartbeat = 600
ds[cpu_nice].min = 0,0000000000e+00
ds[cpu_nice].max = 1,0000000000e+02
ds[cpu_nice].last_ds = "U"
ds[cpu_nice].value = NaN
ds[cpu_nice].unknown_sec = 1
rra[0].cf = "AVERAGE"
rra[0].rows = 600
rra[0].cur_row = 284
rra[0].pdp_per_row = 1
rra[0].xff = 5,0000000000e-01
rra[0].cdp_prep[0].value = NaN
rra[0].cdp_prep[0].unknown_datapoints = 0
rra[1].cf = "AVERAGE"
rra[1].rows = 700
rra[1].cur_row = 612
rra[1].pdp_per_row = 6
rra[1].xff = 5,0000000000e-01
rra[1].cdp_prep[0].value = NaN
rra[1].cdp_prep[0].unknown_datapoints = 2
rra[2].cf = "AVERAGE"
rra[2].rows = 775
rra[2].cur_row = 144
rra[2].pdp_per_row = 24
rra[2].xff = 5,0000000000e-01
rra[2].cdp_prep[0].value = NaN
rra[2].cdp_prep[0].unknown_datapoints = 20
rra[3].cf = "AVERAGE"
rra[3].rows = 797
rra[3].cur_row = 90
rra[3].pdp_per_row = 288
rra[3].xff = 5,0000000000e-01
rra[3].cdp_prep[0].value = NaN
rra[3].cdp_prep[0].unknown_datapoints = 164
rra[4].cf = "MAX"
rra[4].rows = 600
rra[4].cur_row = 156
rra[4].pdp_per_row = 1
rra[4].xff = 5,0000000000e-01
rra[4].cdp_prep[0].value = NaN
rra[4].cdp_prep[0].unknown_datapoints = 0
rra[5].cf = "MAX"
rra[5].rows = 700
rra[5].cur_row = 67
rra[5].pdp_per_row = 6
rra[5].xff = 5,0000000000e-01
rra[5].cdp_prep[0].value = NaN
rra[5].cdp_prep[0].unknown_datapoints = 2
rra[6].cf = "MAX"
rra[6].rows = 775
rra[6].cur_row = 113
rra[6].pdp_per_row = 24
rra[6].xff = 5,0000000000e-01
rra[6].cdp_prep[0].value = NaN
rra[6].cdp_prep[0].unknown_datapoints = 20
rra[7].cf = "MAX"
rra[7].rows = 797
rra[7].cur_row = 58
rra[7].pdp_per_row = 288
rra[7].xff = 5,0000000000e-01
rra[7].cdp_prep[0].value = NaN
rra[7].cdp_prep[0].unknown_datapoints = 164
The OID for "1er_equipement_cpu_usage_nice" :
SNMP Version: 2, Community: cacti, OID: .1.3.6.1.4.1.2021.11.51.0
RRD: /usr/share/cacti/rra/1er_equipement_cpu_nice_37.rrd
Then :
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snmpwalk -v2c -c cacti 192.168.0.253 .1.3.6.1.4.1.2021.11.51.0
UCD-SNMP-MIB::ssCpuRawNice.0 = No Such Object available on this agent at this OID
(but if i try with the others OID of poller cache item , that's working...)