[c-nsp] ifHCOutOctets Counter64

talex keenav at gmail.com
Thu Jun 21 08:27:32 EDT 2007


Hello,

After upgradeing the IOS version to 12.2(33)SRA3 on C7613 Sup720, i've
noticed
some errors in the result returned by the snmp OID ifHCOutOctets
(.1.3.6.1.2.1.31.1.1.1.10.X)
when the outbound traffic on the interface is getting above 1,4-1,5 Gbps.
The counter
ifHCOutOctets is incrementing very slow compared with the interface rate and
it seems
this is present only for SVI and POS interfaces. If the interface rate is
below 1.4-1.5Gbps than
all is working just fine.

r1#sh snmp mib ifmib ifindex pos 5/1
Interface = POS5/1, Ifindex = 158

r1#sh int pos 5/1 | i rate
Queueing strategy: fifo
30 second input rate 1069306000 bits/sec, 241519 packets/sec
30 second output rate 1603264000 bits/sec, 288090 packets/sec

Counters at the moment t:
IF-MIB::ifHCInOctets.158 = Counter64: 526401519111626
IF-MIB::ifHCOutOctets.158 = Counter64: 313770252452833

Counters at the moment t+300s:
IF-MIB::ifHCInOctets.158 = Counter64: 526439672838946
IF-MIB::ifHCOutOctets.158 = Counter64: 313777262293509


>From my calculation i get 1.02Gbps inbound and 186,93Mbps outbound witch is
far away from
the reality . Is there anyone else who encounter this problem so far? I was
looking on the
cisco bug toolkit but nothing regarding my problem.


Thanks.

Alexandru Tudori


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