Extron electronics SMP 351 User Manual page 116

5. If it will be used, configure SNMP. Simple Network Management Protocol (SNMP)
facilitates the exchange of basic network management information between network
devices. It helps in monitoring of operations and factors such as bandwidth, memory
usage, remote password resets, and collection of error information. The text that is
specified in the SNMP-related fields is seen by the network community when the unit is
queried.
a. Select the Enable SNMP check box. When checked, the unit allows SNMP
communication. If unchecked (clear), the unit does not use SNMP.
b. If desired, type a new port number into the SNMP port: field or use the Up and
Down arrows to change the value.
c.
To set a password for network management that will be publicly accessible,
enter a password in the Public Password: field. The password can be any
alphanumeric name of 4 to 12 characters. Letters, numbers, and hyphens are
allowed. Spaces, slashes, and symbols are not permitted.
NOTE: The public password is also referred to as the Public Community
String.
d. If desired, in the SNMP Contact: field, enter the name of the person who can
be contacted for assistance with this SMP 351 unit in case someone (such as a
network administrator) has questions about this specific device.
e. The SNMP location description cannot be changed from within this panel. To
change the location description, click the Save button within this panel to save the
network settings, navigate to the Configuration>System Settings>Unit
Identification pane, enter a new location description in the Location
field, and click Save. Once the Web pages are refreshed or reloaded, the revised
location name appears in the SNMP section of the Networking pane.
6. Click Save.
About the link local IP address
The Networking pane displays a "Link Local" IP address. This address cannot be
changed by users. It is negotiated automatically by the SMP 351. This address provides a
way for the unit to communicate on the network in a peer-to-peer fashion in the event that a
DHCP server is unavailable.
Regular, private IP addresses are assigned by a local network administrator either on a static
basis or automatically (using a DHCP server that has been set up with an assigned range of
addresses). This is one form of a client-server system.
Many routers come from the manufacturer configured with a commonly-used range of
private addresses (for IPv4, the address range is 192.168.0.0/16) that can be assigned
using DHCP. In systems without a network administrator, the router can assign numbers
from that default range of addresses to devices on the LAN. This is another way to set up a
client-server system.
If a network has neither of the previous two options, individual devices (PCs, codecs,
decoders) generate and use their own link local addresses (for IPv4, the address range is
169.254.0.0/16). This method requires no network configuration of the device, and it
works using peer-to-peer communication rather than a client-server system.
Link local IP addresses use a separate range of addresses from those assigned by a DHCP
server so they cannot conflict with the server-assigned addresses.
SMP 351 • Web-Based User Interface 110