12713020-002-2 Revision D – April 2004 SSU-2000 User’s Guide 385
SNMP Protocol
If SNMP is present, port 161 becomes the port of standard SNMP interactive
communications and port 162 becomes the trap port. Since the SSU-2000 SNMP
supports all existing functions, full system control of the SSU-2000 can be
maintained through SNMP.
All reports, queries, and autonomous messages are available through SNMP. All
control and provisioning and some administration is available through SNMP. You
cannot use SNMP to:
change communication port parameters
set a user ID and Password
set IP assignments
reset a connection
change SNMP authentication and privacy settings
Refer to the MIB Specification (part number 12613250-000-2) for further
information. Refer to TL1 Command Interface, on page 266, and Interactive
Command Set, on page 315, for specific information on the following commands.
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-2000 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-2000 MIB object identifiers
include the SSU-2000 system, its modules, module features, input ports, output
ports, etc. and variables include settings and measurements.
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