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MIB Primitive Types
ATX MIB Reference Guide
1-5
 
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 X1 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 X1 byte 
Array of bytes
PhysAddress  
n X1 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)