ES-4024A User’s Guide
Chapter 19 Access Control 127
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:
19.3.1 Supported MIBs
MIBs let administrators collect statistics and monitor status and performance.
The ES-4024A 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
19.3.2 SNMP Traps
The ES-4024A sends traps to an SNMP manager when an event occurs. SNMP traps
supported are outlined in the following table.
Table 38 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.
Table 39 SNMP Traps
GENERIC TRAP SPECIFIC TRAP DESCRIPTION
0 (Cold Start) 0 This trap is sent when the ES-4024A is turned on.
1 (WarmStart) 0 This trap is sent when the ES-4024A 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.
