User's Manual

3 Detailed Description
APCD-LM043-4.0 51
CAUTION: The local host entry, 127.0.0.1, is required to avoid
the problem where the CCU cannot find a real NTP server (i.e., if
the network is down).
3.6.4 Customer List
For each EUM, the system operator can control the number of end-user computers that can
access the LMS4000 network for the purpose of controlling network performance or service
differentiation. The use of this list is described in Customer Table (EUM only) on page 192.
3.6.5 SNMP Support
Simple Network Management Protocol (SNMP) allows a network management server to
monitor, control, and remotely configure LMS4000 network devices. In SNMP, these devices
are also referred to as agents.
Community Strings
Community strings act as passwords to facilitate communication between the SNMP server
and a network device. There are three types of community strings:
• Read community strings, which enable SNMP servers to retrieve information from a
network device
• Write community strings, which enable SNMP servers to send information, such as
configuration commands, to a network device.
NOTE: At this time, there are no writable SNMP MIB entries. All
configuration is done via the CLI.
• Trap server IP address and community strings, which enable SNMP servers to
receive unsolicited messages from a network device. These unsolicited messages
indicate asynchronous events, such as an interface going down or coming up, a unit
performing a cold or warm start, or an operational failure.
Each network device monitored by SNMP must have at least one of each type of community
string defined. Each CCU and EUM can have up to five read or read/write and five trap
servers/community strings defined. Non-WaveRider devices may have only one of each type
of community string defined. Community strings are case sensitive.
Table 9 Factory Configured Community Strings
Community String Type Community String
Read public
Write private
Trap <none>