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Chapter 4 NTP and SNMP
SNMP Protocol
238
SSU-2000e Technical Reference
12713140-003-2 Revision E.01 – January 2007
SNMP v3 Details
Symmetricom’s implementation of SNMP v3 does not allow remote user
configuration. Users and user levels must be set by an administrator (level 4
access) using TL1 or ICS commands only. The administrator can add up to five
users to the SNMP user table and set the users to access level 1 (user), access
level 2 (technician), or access level 3 (supervisor).
User levels are based on authentication and privacy settings. There are two
authentication protocols: HMAC-MD5-96 and HMAC-SHA-96. The HMAC-MD5-96
authentication key is 16 characters long and the HMAC-SHA-96 authentication key
is 20 characters long. The privacy protocol is CBC-DES with a 16-character key. All
keys are uppercase.
A user with no authentication and no privacy only has access to the “system” object
in the Management Information Base (MIB).
A user with authentication, but no privacy can only view the SSU-2000e MIB.
A user with authentication and privacy and has full access to the MIB in accordance
with the specification.
Management Information Base
The Management Information Base (MIB) is a virtual database of managed objects,
their object identifiers, and variables. Typical SSU-2000e MIB object identifiers
include the SSU-2000e system, its modules, module features, input ports, output
ports, etc. and variables include settings and measurements.
The MIB is controlled by the SSU-2000e’s SNMP agent. The SNMP agent is a
server program that sends SSU-2000e status (stored in the MIB database) to the
network manager when the manager transmits
GET
or
GET NEXT
commands. The
manager can also transmit
SET
commands that instruct the agent to set MIB
variables to new values. The
TRAP
command sets up a communication link that
allows the server to send the manager indications of MIB occurrences, such as a
fault condition.
Enabling SNMP
To use the TL1 command to enable SNMP and have the unit transmit all alarms and
events, type:
SET-PRMTR-SNMP-MODE:::::ENA,ALL;
To use the ICS command to enable SNMP and have the unit transmit all alarms and
events, type:
SNMP ENABLE
and press
Enter
.
Содержание SDU-2000e
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