Configuring SNMP
SNMP Engine ID
Cisco Small Business 300 Series Managed Switch Administration Guide 281
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The Object IDs are placed under:
enterprises(1).cisco(9).otherEnterprises(6).ciscosb(1).
The MIB root is 1.3.6.1.4.1.9.6.1.101.
SNMP Engine ID
The Engine ID is only used by SNMPv3 entities to uniquely identify them. An SNMP
agent is considered an authoritative SNMP engine. This means that the agent
responds to incoming messages (Get, GetNext, GetBulk, Set), and sends Trap
messages to a manager. The agent's local information is encapsulated in fields in
the message.
Each SNMP agent maintains local information that is used in SNMPv3 message
exchanges (not relevant for SNMPv1 or SNMPv2). The default SNMP Engine ID is
comprised of the enterprise number and the default MAC address. The SNMP
engine ID must be unique for the administrative domain, so that no two devices in a
network have the same engine ID.
The local information is stored in four MIB variables that are read-only
(snmpEngineId, snmpEngineBoots, snmpEngineTime, and
snmpEngineMaxMessageSize).
CAUTION When the engine ID is changed, all configured users and groups are erased.
To define the SNMP engine ID:
STEP 1 Click SNMP > Engine ID. The
Engine ID Page
opens.
STEP 2 Select the Local Engine ID.
• Use default—Select to use the device-generated engine ID. The default
Engine ID is based on the switch MAC address, and is defined per standard
as:
- First 4 octets—First bit = 1, the rest is the IANA enterprise number.
- Fifth octet—Set to 3 to indicate the MAC address that follows.
- Last 6 octets—MAC address of the switch.
• None—No Engine ID is used.
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