D-Link DES 6000 Product Manual - Page 53

STP Port Settings, Hello Time1-10 Sec

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Modular Ethernet Switch User's Guide 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. ♦ Hello Time(1-10 Sec) Hello Time is a read-write object that 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. If you set a Hello Time for your Switch, and it is not the Root Bridge, the set Hello Time will be used if and when your Switch becomes the Root Bridge. ♦ Forward Delay(4-30 Sec) The Forward Delay is a read-write object that can be set from 4 to 30 seconds. This is the time any port on the Switch spends in the listening state while moving from the blocking state to the forwarding state. ♦ Bridge Priority(0-65535) A Bridge Priority is a read-write object that can be set from 0 to 65535. This is the priority number of the bridge. The value is used in conjunction with the bridge MAC address to set the bridge ID, which in turn is used when determining the root bridge of a multibridged network. The root bridge is responsible for processing data packets when network loops occur. The smaller the number set, the higher the bridge priority is. The higher the bridge priority, the more chance the bridge has of becoming the root bridge. Zero is the highest priority. STP Port Settings To change the parameters on individual ports: Choose Configure Spanning Tree Protocol from the System Configuration menu. Choose STP Port Settings from the Configure Spanning Tree Protocol menu. The following screen appears: Figure 6-21. STP Port Settings screen Items in the above window are described as follows: ♦ Module Choose a module on the switch on which to configure the Spanning Tree Port settings. ♦ STP Status Sets the Spanning Tree Protocol on a particular port to Enabled or Disabled. ♦ Cost The Path Cost is a read-only parameter which is the first consideration when deciding on a designated port for switch to switch connections. Each 10Mbps port has a predefined cost of 100, each 100Mbps port has a predefined cost of 19, and each 1000Mbps port has a predefined cost of 4. Trunked ports have a cost of (base cost) minus (no. of ports in the group). ♦ Priority Port Priority is a read-write object that can be set from 0 to 255. The priority is used to determine the designated port if the Path costs of redundant switch to switch connections are the 48 Using the Console Interface

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Modular Ethernet Switch User’s Guide
48
Using the Console Interface
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.
♦
Hello Time(1-10 Sec)
Hello Time is a read-write object that 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. If you set a Hello Time for your Switch, and it is not the
Root Bridge, the set Hello Time will be used if and when your Switch becomes the Root Bridge.
♦
Forward Delay(4-30 Sec)
The Forward Delay is a read-write object that can be set from 4 to 30
seconds. This is the time any port on the Switch spends in the listening state while moving from the
blocking state to the forwarding state.
♦
Bridge Priority(0-65535)
A Bridge Priority is a read-write object that can be set from 0 to 65535.
This is the priority number of the bridge. The value is used in conjunction with the bridge MAC
address to set the bridge ID, which in turn is used when determining the root bridge of a multi-
bridged network. The root bridge is responsible for processing data packets when network loops
occur. The smaller the number set, the higher the bridge priority is. The higher the bridge priority,
the more chance the bridge has of becoming the root bridge. Zero is the highest priority.
STP Port Settings
To change the parameters on individual ports:
Choose
Configure Spanning Tree Protocol
from the
System Configuration
menu.
Choose
STP Port Settings
from the
Configure Spanning Tree Protocol
menu. The following screen
appears:
Figure 6-21.
STP Port Settings screen
Items in the above window are described as follows:
♦
Module
Choose a module on the switch on which to
configure the Spanning Tree Port settings.
♦
STP Status
Sets the Spanning Tree Protocol on a particular port to
Enabled or
Disabled
.
♦
Cost
The Path Cost is a read-only parameter which is the first consideration when deciding on a
designated port for switch to switch connections. Each 10Mbps port has a predefined cost of 100, each
100Mbps port has a predefined cost of 19, and each 1000Mbps port has a predefined cost of 4.
Trunked ports have a cost of (base cost) minus (no. of ports in the group).
♦
Priority
Port Priority is a read-write object that can be set from 0 to 255. The priority is used to
determine the designated port if the Path costs of redundant switch to switch connections are the