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13-3
Viewing SNMP Group Information
Bad Community Names
The total number of messages delivered to the SNMP protocol entity which used
a SNMP community name not known to the entity, according to the
snmpInBadCommunityNames. An SNMP Get or Set request must be accompanied
by a valid community name.
Bad Community Operations
The total number of SNMP messages delivered to the SNMP protocol entity
which represented an SNMP operation which was not allowed by the SNMP
community named in the message, according to the snmpInBadCommunityUses.
The community name specified in the SNMP message did not have the necessary
privileges to complete the operation. For example, you issued a Set-Request, but
specified a community name that only granted read access.
Parse Errors
The total number of ASN.1 or BER errors encountered by the SNMP protocol
entity when decoding received SNMP messages, according to the
snmpInBadCommunityUses. ASN.1 is Abstract Syntax Notation One, the
International Standards Organization (ISO) MIB object identification and naming
convention. BER is Basic Encoding Rules, an algorithm that encodes an ASN.1
value into a form suitable for transmission. A parse error indicates that the
received BER value, or the ASN.1 value encoded in the received BER, does not
conform to the syntax rules. In other words, you got a good SNMP packet, but the
data it contained was useless.
tooBig Errors
The total number of valid SNMP PDUs which were delivered to the SNMP
protocol entity and for which the value of the error status field is ‘tooBig’,
according to the snmpInTooBigs. A too Big error is often due to a Get-Next
operation because the Get-Next operation can retrieve a large amount of data. It
occurs when the SNMP agent could not fit the results of an operation into a single
SNMP message.
noSuchName Errors
The total number of SNMP PDUs which were delivered to the SNMP protocol
entity and for which the value of the error-status field is noSuchName, according
to the snmpInNoSuchNames. A Set operation returned an error; the variable name
specified in the Set did not exist according to the community profile (the
combination of a community name’s access mode — read only or read/write —
with the subset of MIB objects defined for the community name).
badValue Errors
The total number of SNMP PDUs which were delivered to the SNMP protocol
entity and for which the value of the error-status field is badValue, according to
the snmpInBadValues. An incoming Set operation specified an incorrect syntax or
value.