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Page 31 / 52 Scroll up to view Page 26 - 30
26
Spanning Tree Setting
This Switch supports the 802.1d Spanning Tree Protocol.
Every segment will have a single path to the root bridge. All bridges listen
for BPDU packets. However, BPDU packets are sent more frequently - with
every Hello packet. BPDU packets are sent even if a BPDU packet was not
received. Therefore, each link between bridges is sensitive to the status of
the link. Ultimately this difference results in faster detection of failed links,
and thus faster topology adjustment. A draw-back of 802.1d is this absence
of immediate feedback from adjacent bridges.
Figure 24.
Spanning Tree Setting
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27
STP Function:
To selecting enable or disable STP function on the Switch.
Bridge Priority:
This value between 0 and 65535 to specify the priority for
forwarding packets. The lower the value, the higher the priority. The default
is 32768.
Bridge Max Age:
This value may be set to ensure that old information does
not endlessly circulate through redundant paths in the network, preventing
the effective propagation of the new information. Set by the Root Bridge,
this value will aid in determining that the Switch has spanning tree
configuration values consistent with other devices on the bridged LAN. If
the value ages out and a BPDU has still not been received from the Root
Bridge, the Switch will start sending its own BPDU to all other switches for
permission to become the Root Bridge. If it turns out that your switch has the
lowest Bridge Identifier, it will become the Root Bridge. The user may
choose a time between 6 and 40 seconds. The default value is 20.
Bridge Hello Time:
The user may set the time interval between
transmission of configuration messages by the root device, thus stating that
the Switch is still functioning. A time between 1 and 10 seconds may be
chosen, with a default setting of 2 seconds.
Bridge Forward Delay:
The maximum amount of time (in seconds) that the
root device will wait before changing states. The user may choose a time
between 4 and 30 seconds. The default is 15 seconds.
Port Path Cost:
This defines a metric that indicates the relative cost of
forwarding packets to specified port list. The value between 1 and 65535 to
determine the cost. The lower the number, the greater the probability the port
will be chosen to forward packets. The default value is 10.
Port Path Priority:
Select a value between 0 and 255 to specify the priority
for a specified port for forwarding packets. The lower the value, the higher
the priority. The default is 128.
Page 33 / 52
28
SNMP Setting
Simple Network Management Protocol (SNMP) is an OSI Layer 7
(Application Layer) designed specifically for managing and monitoring
network devices. SNMP enables network management stations to read and
modify the settings of gateways, routers, switches, and other network devices.
Use SNMP to configure system features for proper operation, monitor
performance and detect potential problems in the Switch, switch group or
network.
Managed devices that support SNMP include software (referred to as an agent),
which runs locally on the device. A defined set of variables (managed objects)
is maintained by the SNMP agent and used to manage the device. These
objects are defined in a Management Information Base (MIB), which provides
a standard presentation of the information controlled by the on-board SNMP
agent. SNMP defines both the format of the MIB specifications and the
protocol used to access this information over the network.
The Switch supports the SNMP versions 1. In SNMP v.1, user authentication
is accomplished using 'community strings', which function like passwords.
The remote user SNMP application and the Switch SNMP must use the same
community string. SNMP packets from any station that has not been
authenticated are ignored (dropped).
The default community strings for the Switch used for SNMP v.1 management
access are:
public
- Allows authorized management stations to retrieve MIB objects.
private
- Allows authorized management stations to retrieve and modify MIB
objects.
Traps
Traps are messages that alert network personnel of events that occur on the
Switch. The events can be as serious as a reboot (someone accidentally
turned OFF the Switch), or less serious like a port status change. The Switch
generates traps and sends them to the trap recipient (or network manager).
Typical traps include trap messages for Device boot up, Authentication
Failure, Port status change and Abnormal transmit/receive data packet error.
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29
MIBs
Management and counter information are stored by the Switch in the
Management Information Base (MIB). The Switch uses the standard MIB-II
Management Information Base module. Consequently, values for MIB objects
can be retrieved from any SNMP-based network management software. In
addition to the standard MIB-II, the Switch also supports its own proprietary
enterprise MIB as an extended Management Information Base. The
proprietary MIB may also be retrieved by specifying the MIB Object Identifier.
MIB values can be either read-only or read-write.
Enabled / Disabled:
To selecting enable or disable SNMP function on the
Switch.
SNMP Community / Trap:
To configure the SNMP Community or SNMP
Trap configuration.
Configure SNMP Community:
Figure 25.
SNMP Community Setting
Add Group:
To add a SNMP Community group, press
“Add Group”
button,
the Add SNMP Community configuration window will pop out; fill in the
community name and assign the community enable read_only or read_write.
Press “Apply” button to execute the setting.
Figure 26.
Add SNMP Community group
Page 35 / 52
30
Delete Group:
To delete previously defined SNMP Community group,
press
“Delete Group”
button, the Delete SNMP Community configuration
window will pop out; checked the delete dialog box. Press
“Apply”
to delete
the selected SNMP Community Group.
Figure 27.
Delete SNMP Community group
Modify Group:
To modify previously defined SNMP Community group,
click on the
ID
parameter to enter to the selected SNMP Community Group
to configure its community name and community enable. Press
“Apply”
to
save change of the SNMP Community Group.
Figure 28.
Modify SNMP Community group
Configure SNMP Trap:
Figure 29.
Configure SNMP Trap Setting

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