ZyXEL Communications Dimension ES-3024, User Manual, Page: 130 / 212

Dimension ES-3024 Ethernet Switch
Access Control 17-3
Management Information Base (MIB) is a collection of managed objects. SNMP allows a manager and agents to
communicate for the purpose of accessing these objects.
SNMP itself is a simple request/response protocol based on the manager/agent model. The manager issues a request
and the agent returns responses using the following protocol operations:
Table 17-2 SNMP Commands
COMMAND DESCRIPTION
Get Allows the manager to retrieve an object variable from the agent.
GetNext Allows the manager to retrieve the next object variable from a table or list within an agent. In
SNMPv1, when a manager wants to retrieve all elements of a table from an agent, it initiates a
Get operation, followed by a series of GetNext operations.
Set Allows the manager to set values for object variables within an agent.
Trap Used by the agent to inform the manager of some events.
17.3.1 Supported MIBs
MIBs let administrators collect statistics and monitor status and performance.
The ES-3024 supports the following MIBs:
SNMP MIB II (RFC 1213) RFC 1157 SNMP v1
RFC 1493 Bridge MIBs RFC 1643 Ethernet MIBs
RFC 1155 SMI RFC 2674 SNMPv2, SNMPv2c
RFC 1757 RMON SNMPv2, SNMPv2c or later version, compliant with RFC 2011
SNMPv2 MIB for IP, RFC 2012 SNMPv2 MIB for TCP, RFC
2013 SNMPv2 MIB for UDP
17.3.2 SNMP Traps
The ES-3024 sends traps to an SNMP manager when an event occurs. SNMP traps supported are outlined in the
following table.
Table 17-3 SNMP Traps
GENERIC TRAP SPECIFIC TRAP DESCRIPTION
0 (Cold Start) 0 This trap is sent when the ES-3024 is turned on.
1 (WarmStart) 0 This trap is sent when the ES-3024 restarts.
2 (linkDown) 0 This trap is sent when the Ethernet link is down.
3 (linkUp) 0 This trap is sent when the Ethernet link is up.
4
(authenticationFailure) 0 This trap is sent when an SNMP request comes from non-
authenticated hosts.
17.3.3 Configuring SNMP