[f-nsp] Problem with CPU load monitoring via SNMP

[Gerald Krause]

Hello folks :)

Our System: NetIron 400 + M4 + B2P8.0

I've noticed some strange difference when comparing the CPU/Process load 
values coming from the local console...

 N400#sh proc cpu
 Process Name   5Sec(%)   1Min(%)   5Min(%)   15Min(%)   Runtime(ms)
 ACL              0.00      0.00      0.00      0.00              0
 ARP              0.00      0.00      0.01      0.00         621932
 BGP              0.02      0.03      0.03      0.03        3223299
 DOT1X            0.00      0.00      0.00      0.00              0
 GVRP             0.00      0.00      0.00      0.00              0
 ICMP             0.46      0.55      0.51      0.46         188671
 IP               7.13      8.34      7.28      6.69       21731944
 IP_M             0.00      0.00      0.00      0.00          53112
 IPUP             0.11      0.06      0.06      0.07        3335265
 ISIS             0.00      0.00      0.00      0.00              0
 L2VLAN           0.00      0.00      0.00      0.00              0
 NAT              0.00      0.00      0.00      0.00              0
 OSPF             0.09      0.11      0.10      0.09        6377250
 RIP              0.00      0.00      0.00      0.00         253837
 STP              0.00      0.00      0.00      0.00              0
 VRRP             0.00      0.00      0.00      0.00           9899
 IPv6             0.02      0.03      0.03      0.03        3102331
 ICMP6            0.06      0.07      0.07      0.07        6094057
 ND6              0.00      0.00      0.00      0.00          15139
 RIPng            0.00      0.00      0.00      0.00           9502
 OSPFv3           0.00      0.00      0.00      0.00              0
 IPV6_RX          0.00      0.00      0.00      0.00              3

...with the ones obtained via SNMP:

 admin at somehost# snmpwalk [...]
 enterprises.1991.1.1.2.1.35.0 = Gauge32: 1
 enterprises.1991.1.1.2.1.50.0 = Gauge32: 1
 enterprises.1991.1.1.2.1.51.0 = Gauge32: 1
 enterprises.1991.1.1.2.1.52.0 = Gauge32: 1

The SNMP query always produce "1" for all CPU related OID I know and not 
my expected value (which would be somewhat between 7...9)!

 - It's a Software bug?
 - Have I referenced the wrong OID?
 - Maybe the overall CPU load ist _not_ the appropriate column sum?


Thx for any hints

 --Gerald