User`s manual

Mediant 1000
H.323 User's Manual 364 Document #: LTRT-83401
15.8 SNMP Manager Backward Compatibility
With support for the Multi Manager Trapping feature, the older acSNMPManagerIP MIB
object, which is synchronized with the first index in the snmpManagers MIB table is also
supported. This is translated in two features:
 SET/GET to either of the two MIB objects is identical. In other words, as far as the
SET/GET are concerned, OID 1.3.6.1.4.1.5003.9.10.1.1.2.7 is identical to
OID 1.3.6.1.4.1.5003.9.10.1.1.2.21.1.1.3.
 When setting ANY IP to the acSNMPManagerIP (this is the older parameter, not the
table parameter), two more parameters are SET to ENABLE. snmpManagerIsUsed.0
and snmpManagerTrapSendingEnable.0 are both set to 1.
15.9 Dual Module Interface
Dual module boards comprise of two modules (the first module is on the right side of the
board when looking at it from the front). As the two modules reside in a single board it is
important to differentiate between them. Differentiation is based on the modules’ serial
numbers.
MIB object acSysIdSerialNumber always returns the serial number of the module on which
the GET operation is performed.
MIB object acSysIdFirstSerialNumber always returns the serial number of the first module.
If the module on which the GET operation is performed is the second module, then the
values of these two objects are different. If, on the other hand, the module is the first
module, the values of these two objects are the same.
15.10 SNMP NAT Traversal
A NAT placed between the gateway and the element manager calls for traversal solutions:
 Trap source port: all traps are sent out from the SNMP port (default 161). A manager
receiving these traps can use the binding information (in the UDP layer) to traverse
the NAT back to the device.
The trap destination address (port and IP) are as configured in the snmpTargetMIB.
 acKeepAliveTrap: this trap is designed to be a constant life signal from the device to
the manager allowing the manager NAT traversal at all times. The
acBoardTrapGlobalsAdditionalInfo1 varbind has the device’s serial number.
The destination port (i.e., the manager port for this trap) can be set to be different than
the port to which all other traps are sent. To do this, use the
acSysSNMPKeepAliveTrapPort object in the acSystem MIB or the ini file parameter
KeepAliveTrapPort.
The Trap is instigated in three ways:
• Via an ini file parameter (SendKeepAliveTrap = 1). This ensures that the trap is
continuously sent. The frequency is set via the 9/10 of the
acSysSTUNBindingLifeTime object.
• After the STUN client has discovered a NAT (any NAT).
• If the STUN client cannot contact a STUN server.
Note: The two latter options require the STUN client be enabled (EnableSTUN).
Also, once the acKeepAlive trap is instigated it does not stop.
 The manager can view the NAT type in the MIB:
audioCodes(5003).acProducts(9).acBoardMibs(10).acSystem(10).acSystemStatus(2).
acSysNetwork(6).acSysNAT(2).acSysNATType(1).