ifExtnsTestCode
if Extensions Test Code
1.3.6.1.2.1.12.2.1.6
This object contains a code which contains more specific information on the test result, for example an error-code after a failed test. Error codes and other values this object may take are specific to the type of interface and/or test. However, one subject identifier: testCodeUnknown OBJECT IDENTIFIER ::= { 0 0 } for use if no additional result code is available. Note that testCodeUnknown is a syntactically valid object identifier, and any conformant implementation of ASN.1 and the BER must be able to generate and recognize this value.
Back to rfc1229 MIB page.
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