Rev D System Management Module 2 (SMM-2) 7-45
SNMP Configuration and Operation
Manager Setup
Load the required MIBs based on the type of modules in your system. Configure the Manager
to communicate to set the IP address of the SNMP agent. ARRIS recommends using CORView
Element Manager Software.
NMS Operations
Element management is achieved by a customer-provided NMS using the ARRIS or a
third-party SNMP manager package. The basic operations performed by the NMS are gets,
sets, and traps. CORView can provide consolidated configuration, status, and alarming
information.
Traps and Alarms
Refer to Figure 5.34 for the operational sequence of the trap operation. A trap is a way for
an agent to tell the NMS that a predefined event has occurred, typically generating an alarm.
A trap originates from the agent and is sent to the trap destination, as configured within the
frame agent itself. The trap destination is typically the IP address of the NMS. No
acknowledgment is sent from the NMS to the agent, so the agent has no way of knowing if
the trap makes it to the NMS.
Figure 7.34
Trap Command
Sequence Diagram
All SNMP traps are HMS enterprise traps based on the SCTE-HMS standard. The trap
variables that are supported by the SCTE-HMS-HE-COMMON-MIB (ANSI/SCTE 84-1 2009) file
have been extended and ARRIS is including a chpHeadendCommon.MIB MIB that includes
three trap variables in addition to the trap variables supported by the HMS standard. The
HMS standard uses one trap (OID of 1.3.6.1.4.1.5591.1.1.0) and its variable bindings contain
the information about the problem that caused the trap.
Table 7.6 Description of HMS Trap (heCommonAlarmEvent
OID Name Variable Type Description
heCommonLogIndex Integer32 An index that uniquely identifies an entry in the
log table.
heCommonLogOID OBJECT IDENTIFIER The specific OID of the object that has changed
alarm state.
heCommonLogValue Integer32 The value of the object at the time it changed
alarm state.
heCommonLogState INTEGER The new alarm state of the object which caused
the event to be recorded into the log.
The agent detects that a predetermined event
has occurred and sends a trap PDU to the
NMS Agent
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