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DES-3010F/G / DES-3018 / DES-3026 Fast Ethernet Switch Manual

The following parameters can be set:

Parameter Description

Spanning Tree Protocol

Use the pull-down menu to enable or disable STP globally on the Switch. The

default is Disabled.

Bridge Max Age: (6 - 40

sec)

The Max Age 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: (1 - 10

sec)

The Hello Time can be set from 1 to 10 seconds. This is the interval between two

transmissions of BPDU packets sent by the Root Bridge to tell all other switches

that it is indeed the Root Bridge.

Bridge Forward Delay: (4

- 30 sec)

The Forward Delay can be from 4 to 30 seconds. Any port on the Switch spends

this time in the listening state while moving from the blocking state to the for-

warding state.

Bridge Priority (0-61440)

A Priority for the Switch can be set from 0 to 61440. This number is used in the

voting process between Switches on the network to determine which Switch will

be the root Switch. A low number indicates a high priority, and a high probability

that this Switch will be elected as the root Switch.

Default Path Cost

This read-only field displays the protocol used in determining the default path cost

per port. 802.1T will calculate this 32-bit cost value through the use of a specific

formula based on the port bandwidth.

STP Version

Use the pull-down menu to choose the desired version of STP to be implemented

on the Switch. There are two choices:

STPCompatability - Select this parameter to set the Spanning Tree Protocol

(STP) globally on the switch.

RSTP - Select this parameter to set the Rapid Spanning Tree Protocol (RSTP)

globally on the Switch.

TX Hold Count (1-10)

Used to set the maximum number of Hello packets transmitted per interval. The

count can be specified from 1 to 10. The default is 3.

Forwarding BPDU

This field can be Enabled or Disabled. When Enabled, it allows the forwarding of

STP BPDU packets from other network devices. The default is Enabled.

Click Apply to implement changes made.

NOTE: The Hello Time cannot be longer than the Max. Age. Otherwise, a

configuration error will occur. Observe the following formulas when setting

the above parameters:

Max. Age ≤ 2 x (Forward Delay - 1 second)

Max. Age ≥ 2 x (Hello Time + 1 second)

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