From Net-SNMP Wiki

What quotes should I use for string index values?

There are two ways of encoding variable-length string index values within an OID. The first approach (which can be used anywhere in a list of index values) is to give the length of the string value, followed by the individual characters:

   "wes"   =   3 'w' 'e' 's'

The other approach (which can only be used with the very last index object of a table) is simply to list the individual characters directly:

   "wes"   =   'w' 'e' 's'

This second approach is indicated by the token IMPLIED in the INDEX clause in the MIB table definition. This is also used for fixed-length index values, where the number of characters is explicitly specified in the MIB file.

When working with string index values, the Net-SNMP client tools use double quotes (i.e. "wes") to indicate the first (explicit-length) form, and single quotes (i.e. 'wes') to indicate the second (implicit-length) form.

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17. What quotes should I use for string index values?
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