Net-snmp already supports Dot3StatsTable(1.3.6.1.2.1.10.7.2). Why do we need this?.

snmpwalk -v2c -c public 1.3.6.1.2.1.10.7.2

EtherLike-MIB::dot3StatsIndex.1000 = INTEGER: 1000
EtherLike-MIB::dot3StatsIndex.1001 = INTEGER: 1001
EtherLike-MIB::dot3StatsIndex.1002 = INTEGER: 1002
EtherLike-MIB::dot3StatsAlignmentErrors.1000 = Counter32: 0
EtherLike-MIB::dot3StatsFCSErrors.1000 = Counter32: 0
EtherLike-MIB::dot3StatsFCSErrors.1001 = Counter32: 0
EtherLike-MIB::dot3StatsFCSErrors.1002 = Counter32: 0
EtherLike-MIB::dot3StatsSingleCollisionFrames.1000 = Counter32: 0
EtherLike-MIB::dot3StatsMultipleCollisionFrames.1000 = Counter32: 0
EtherLike-MIB::dot3StatsDeferredTransmissions.1000 = Counter32: 0
EtherLike-MIB::dot3StatsDeferredTransmissions.1001 = Counter32: 0
EtherLike-MIB::dot3StatsDeferredTransmissions.1002 = Counter32: 0

@suresh-rupanagudi For the same reason SONiC implements rfc1213.py and rfc2863.py which are also implemented already by net-snmp, because net-snmp only has access to the management port(s), not the front panel ports.

@bradh352 I could see net-snmp has code for front panel ports also. But its failing because of driver does not support stats.
root@leaf3:~# ethtool -S Ethernet0
no stats available
root@leaf3:# ethtool -i Ethernet0
driver: bcm-knet
version: 17
firmware-version: N/A
expansion-rom-version:
bus-info: N/A
supports-statistics: no
supports-test: no
supports-eeprom-access: no
supports-register-dump: no
supports-priv-flags: no
root@leaf3:#

@suresh-rupanagudi like I said, this is the same situation as rfc1213.py and rfc2863.py. net-snmp has native code to support this, but the front panel stats aren't available to net-snmp. So we have to grab them via SAI.

Ok, I will take a look at sonic-snmpagent part of code.