DES-3010F/DES-3010FL/DES-3010G/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 forwarding 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 Pro-
tocol (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.
LBD
This feature is used to temporarily block STP on the Switch when a
BPDU packet has been looped back to the switch. When the Switch
detects its own BPDU packet coming back, it signifies a loop on the
network. STP will automatically be blocked and an alert will be sent
to the administrator. The LBD STP port will restart (change to
discarding state) when the LBD Recover Time times out. The user
may enable or disable this function using the pull-down menu. The
default is Disabled.
LBD Recover Time
This field will set the time the STP port will wait before recovering the
STP state set. 0 will denote that the LBD will never time out or restart
until the administrator personally changes it. The user may also set a
time between 60 and 1000000 seconds. The default is 60 seconds.
Click Apply to implement changes made.
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