302693-B Rev 00
4-15
Troubleshooting
Simple Network Management Protocol (SNMP) Overview
The Simple Network Management Protocol is a member of the TCP/IP
protocol suite. The CMTS 1000 uses the User Datagram Protocol (UDP) to
exchange messages between a station manager, such as SNMPc™ or
Optivity SNMP Manager, and its onboard SNMP agent.
SNMP encompasses three main areas:
• A small set of management operations
• Definitions of manageable variables
• Data representations
The operations allowed are: Get, GetNext, and Set. These functions operate
on variables that exist in the CMTS 1000. Examples of variables include
static counters (Achieved Pacer Counter - lcachievedpacer), and the CMTS
1000 port status (IfEntry - OperStatus).
All of the SNMP management functions are carried out through these sim-
ple operations. No action operations are available, but these can be simu-
lated by the setting of flag variables. For example, to reset the CMTS 1000,
an integer variable named “docsdevresetnow” is set to a specific value to
reset the CMTS 1000.
SNMP variables are defined using the Abstract Syntax Notation One
(ASN.1). ASN.1 specifies how a variable is encoded in a transmitted data
frame; it is very powerful because the encoded data is self-defining. For
example, the encoding of a text string includes an indication that the data
unit is a string, along with its length and value. ASN.1 is a flexible way of
defining protocols, especially for network management protocols where
nodes may support different sets of manageable variables.
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