D-Link DGS-1248T Router Manual PDF (Setup & Configuration Guide)

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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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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

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.

Page 34 / 52

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

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

parameter to enter to the selected SNMP Community Group

to configure its community name and community enable. Press

“Apply”

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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