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+ it is possible to see this behaviour with a snmpwalk (comparing a working port 0/0/0/36 to non-working 0/0/0/37): $ snmpwalk cisco ifDescr | grep -E '0/0/0/(36|37)' IF-MIB::ifDescr.147 = STRING: Optics0/0/0/36 IF-MIB::ifDescr.148 = STRING: Optics0/0/0/37 IF-MIB::ifDescr.274 = STRING: TwentyFiveGigE0/0/0/37 <<<<<< IF-MIB::ifDescr.275 = STRING: TwentyFiveGigE0/0/0/36 + now doing a SNMP walk on OID entAliasMappingIdentifier: $ snmpwalk cisco .1.3.6.1.2.1.47.1.3.2 | grep ifIndex.275 SNMPv2-SMI::mib-2.47.1.3.2.1.2.5104.0 = OID: IF-MIB::ifIndex.275 $ snmpwalk cisco .1.3.6.1.2.1.47.1.3.2 | grep ifIndex.274 <<<<<< entAliasMappingIdentifier = 1.3.6.1.2.1.47.1.3.2.1.2 (no results) + and this is also visible on the CLI: RP/0/RP0/CPU0:cisco#show inventory raw | beg 0/0/0/36 Wed Mar 1 08:41:36.106 EET NAME: "0/0-TwentyFiveGigE0/0/0/36", DESCR: "25GE Port" PID: N/A , VID: N/A, SN: N/A RP/0/RP0/CPU0:cisco#show inventory raw | beg 0/0/0/37 Wed Mar 1 08:41:45.004 EET NAME: "0/0-TwentyFiveGigE0/0/0/37", DESCR: "25GE Port" PID: N/A , VID: N/A, SN: N/A RP/0/RP0/CPU0:cisco#show snmp entity | inc 0/0/0/37 <<<<<<< no results Wed Mar 1 08:26:55.578 EET RP/0/RP0/CPU0:cisco#show snmp entity | inc 0/0/0/36 Wed Mar 1 08:26:59.994 EET entPhysicalIndex: 5104 entPhysicalName: 0/0-TwentyFiveGigE0/0/0/36
SNMP data is missing:: RP/0/RP0/CPU0:cisco#show snmp entity | inc 0/0/0/37 <<<<<<< no results Wed Mar 1 08:26:55.578 EET RP/0/RP0/CPU0:cisco#show snmp entity | inc 0/0/0/36 Wed Mar 1 08:26:59.994 EET entPhysicalIndex: 5104 entPhysicalName: 0/0-TwentyFiveGigE0/0/0/36
SNMP data is missing:: RP/0/RP0/CPU0:cisco#show snmp entity | inc 0/0/0/37 <<<<<<< no results Wed Mar 1 08:26:55.578 EET RP/0/RP0/CPU0:cisco#show snmp entity | inc 0/0/0/36 Wed Mar 1 08:26:59.994 EET entPhysicalIndex: 5104 entPhysicalName: 0/0-TwentyFiveGigE0/0/0/36
+ it is possible to see this behaviour with a snmpwalk (comparing a working port 0/0/0/36 to non-working 0/0/0/37): $ snmpwalk cisco ifDescr | grep -E '0/0/0/(36|37)' IF-MIB::ifDescr.147 = STRING: Optics0/0/0/36 IF-MIB::ifDescr.148 = STRING: Optics0/0/0/37 IF-MIB::ifDescr.274 = STRING: TwentyFiveGigE0/0/0/37 <<<<<< IF-MIB::ifDescr.275 = STRING: TwentyFiveGigE0/0/0/36 + now doing a SNMP walk on OID entAliasMappingIdentifier: $ snmpwalk cisco .1.3.6.1.2.1.47.1.3.2 | grep ifIndex.275 SNMPv2-SMI::mib-2.47.1.3.2.1.2.5104.0 = OID: IF-MIB::ifIndex.275 $ snmpwalk cisco .1.3.6.1.2.1.47.1.3.2 | grep ifIndex.274 <<<<<< entAliasMappingIdentifier = 1.3.6.1.2.1.47.1.3.2.1.2 (no results) + and this is also visible on the CLI: RP/0/RP0/CPU0:cisco#show inventory raw | beg 0/0/0/36 Wed Mar 1 08:41:36.106 EET NAME: "0/0-TwentyFiveGigE0/0/0/36", DESCR: "25GE Port" PID: N/A , VID: N/A, SN: N/A RP/0/RP0/CPU0:cisco#show inventory raw | beg 0/0/0/37 Wed Mar 1 08:41:45.004 EET NAME: "0/0-TwentyFiveGigE0/0/0/37", DESCR: "25GE Port" PID: N/A , VID: N/A, SN: N/A RP/0/RP0/CPU0:cisco#show snmp entity | inc 0/0/0/37 <<<<<<< no results Wed Mar 1 08:26:55.578 EET RP/0/RP0/CPU0:cisco#show snmp entity | inc 0/0/0/36 Wed Mar 1 08:26:59.994 EET entPhysicalIndex: 5104 entPhysicalName: 0/0-TwentyFiveGigE0/0/0/36