ADTRAN ESU 120e user manual Messages, GetResponse, Trap, ESU 120E Snmp Access

A ppendix A . Understanding SNMP

MESSAGES

The network device issues two types of messages: GetResponse and Trap.

GetResponse

This message is the response to a network manager GetRequest or GetNextRequest command.

Trap

This is an unsolicited message issued by a network device to report an operational anomaly or an alarm condition to the network man- ager.

These messages are typically encased within informational packets and transported over the LAN or WAN (wide area network).

ESU 120E SNMP ACCESS

By default, SNMP MIB Browser access to the ESU 120e IP address with the configured community names, accesses the host. The ESU 120e can also act as an SNMP proxy agent for external units. To access MIB variables on externally chained devices, append a period and the Unit ID of the device to the Read and Read/Write community names. For example, if the Read community name configured in the ESU 120e is public, specifying "public.3" as the community name in the SNMP MIB Browser allows reading SNMP MIB variables from externally chained unit 3.

If the external unit's passcode is not the default, an entry must be added to the Unit Access Table for SNMP MIB access. See the Unit Access Table section in Chapter 3: Operation for more information. However, SNMP traps for the unit can be forwarded without the entry.

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