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1-6

Introduction

1.5 MIB PRIMITIVE TYPES

The MIB deﬁnitions in this document may reference the primitive

types that are described in the Structure and Identiﬁcation of

Management Information for TCP/IP-based Internets, RFC 1155.

RFC 1155 is based on the Speciﬁcation of Abstract Syntax Notation

One, ASN.1. The primitive types are described in Table 1-1.

Table 1-1 Primitive Descriptions

Primitive Size Description

Boolean 1 byte

Enumerated Integer with possible true (1)

or false (2) values; note that the ASN.1

BOOLEAN primitive type is not used

BridgeID 8 bytes

Priority and MAC address used to identify

a spanning tree bridge

Counter 4 bytes max Unsigned value

DisplayString n X 1 byte Array of printable ascii characters

Gauge 4 bytes Non-negative integer

Integer 4 bytes max Signed value

IpAddress 4 bytes Internet address

MacAddress 6 bytes Ethernet address

OctetString n X 1 byte Array of bytes

PhysAddress n X 1 byte

Array of bytes, using the same as a MAC

Address

PortID 2 bytes

Priority and port number used to identify a

spanning tree port

TimeTicks 4 bytes

Max time counter with a granularity of

1/100th of a second (also known as

centiseconds)

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 169 170

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