SNMPCMD下 -Cr1 -Cr3 的問題

snmp cmd

z0954096065 2019-10-07 13:45:57 ‧ 1322 瀏覽

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我下了
snmpbulkget -v2c -c public -Cr1 -Cr3 10.90.90.90 sysDescr ifInOctets ifOutOctets
後
SNMPv2-MIB::sysDescr.0 = STRING: D-Link DGS-3130-30S System - 24SFP + 210GBase-T + 4*10G SFP+, 145.1.10.37
IF-MIB::ifInOctets.55 = Counter32: 0
IF-MIB::ifOutOctets.55 = Counter32: 0
SNMPv2-MIB::sysObjectID.0 = OID: SNMPv2-SMI::enterprises.171.10.154.2.1
IF-MIB::ifInOctets.56 = Counter32: 0
IF-MIB::ifOutOctets.56 = Counter32: 0
DISMAN-EVENT-MIB::sysUpTimeInstance = Timeticks: (1759800) 4:53:18.00
IF-MIB::ifInOctets.57 = Counter32: 0
IF-MIB::ifOutOctets.57 = Counter32: 0

我想問下這一段-Cr1 -Cr3這個是甚麼意思呢??