Chapter 5
Configuring the Switch
45
48-Port 10/100 + 4-Port Gigabit Switch with WebView and Power over Ethernet
The switch can be configured to accept management
commands from Simple Network Management Protocol
(SNMP) applications. You can configure the switch to
respond to SNMP requests or generate SNMP traps.
When SNMP management stations send requests to the
switch (either to return information or to set a parameter),
the switch provides the requested data or sets the specified
parameter. The switch can also be configured to send
information to SNMP managers (without being requested
by the managers) through trap messages, which inform
the manager that certain events have occurred.
The switch includes an SNMP agent that supports SNMP
version 1, 2c, and 3 clients. To provide management access
for version 1 or 2c clients, you must specify a community
string. The switch provides a default MIB View (i.e., an
SNMPv3 construct) for the default “public” community
string that provides read access to the entire MIB tree,
and a default view for the “private” community string that
provides read/write access to the entire MIB tree. However,
you may assign new views to version 1 or 2c community
strings that suit your specific security requirements.
SNMP > Global Parameters
An SNMPv3 engine is an independent SNMP agent that
resides on the switch. This engine protects against message
replay, delay, and redirection. The engine ID is also used in
combination with user passwords to generate the security
keys for authenticating and encrypting SNMPv3 packets.
A local engine ID is automatically generated that is unique
to the switch. This is referred to as the default engine ID. If
the local engine ID is deleted or changed, all SNMP users
will be cleared. You will need to reconfigure all existing
users.
SNMP > Global Parameters
A new engine ID can be specified by entering 5 to 32
octets in hexadecimal characters.
Local Engine ID Enter an ID of 5 to 32 hexadecimal
characters and then click Save.
User Default Check this box to set as default.
Enable Authentication Traps Issues a notification
message to specified IP trap managers whenever
authentication of an SNMP request fails. Click the check
box to enable Authentication traps.
Enable Link-up and Link-down Traps Issues a
notification message whenever a port link is established
or broken. Click the check box to enable Link-up/down
traps.
To send inform messages to an SNMPv3 user on a remote
device, you must first specify the engine identifier for the
SNMP agent on the remote device where the user resides.
The remote engine ID is used to compute the security
digest for authenticating and encrypting packets sent to a
user on the remote host.
SNMP passwords are localized using the engine ID of the
authoritative agent. For informs, the authoritative SNMP
agent is the remote agent. You therefore need to configure
the remote agent’s SNMP engine ID before you can send
proxy requests or informs to it.
The engine ID can be specified by entering 5 to 32
hexadecimal characters.
Remote Engine ID Enter an ID of 5 to 32 hexadecimal
characters.
Remote IP Host The Internet address of the remote
device where the user resides.
Action Click to add or remove the Remote Engine ID and
Remote host details entered.
