B.12. Defining New Types
Although the data types defined in the SMI are sufficient, it is sometimes convenient to be a bit more specific. For example, you may want to restrict the possible values in an OCTET STRING or the range covered by an Integer32; if your MIB uses the same restricted values repeatedly, it will become tedious to describe these same restrictions repeatedly.
RFC 1903 describes the textual convention, a macro that allows you to bind your clarifications together into a new type. The following textual convention is taken from the file SNMPv2-TC.txt distributed with Net-SNMP (version 5.0.8).
DisplayString ::= TEXTUAL-CONVENTION DISPLAY-HINT "255a" STATUS current DESCRIPTION "Represents textual information taken from the NVT ASCII ...
Get Linux Appliance Design now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
