D-Link DES-3226SM Product Manual - Page 88
Spanning Tree, STP Switch Settings
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DES-3226S Layer 2 Fast Ethernet Switch User's Guide Spanning Tree The Switch supports 802.1d Spanning Tree Protocol (STP) and 802.1w Rapid Spanning Tree Protocol (RSTP). RSTP is compatible with 802.1d STP however the advantages of rapid network convergence is lost if the Switch is connect to a segment that cannot support RSTP. STP Switch Settings Spanning Tree Protocol operates on two levels: on the Switch level, the settings are globally implemented. On the port level, the settings are implemented on a per user-defined Group of ports basis. Figure 6 - 62. STP Switch Settings Configure the following parameters and click the Apply button to implement them: Parameter Description Status Max Age: (6 - 40 sec) Hello Time: (1 - 10 sec) < 2 > Forward Delay: (4 - 30 sec) Priority: (0 - 61440) STP Version Tx Hold Count Forwarding BPDU This field can be toggled between Enabled and Disabled using the pull-down menu. This will enable or disable the Spanning Tree Protocol (STP), globally, for the Switch. The Max. Age can be set from 6 to 40 seconds. At the end of the Max. Age, if a BPDU has still not been received from the Root Bridge, your 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 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. The Forward Delay can be 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. 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. Choose RSTP (default) or STP Compatibility. Both versions use STP parameters in the same way. RSTP is fully compatible with IEEE 802.1d STP and will function with legacy equipment. This is the maximum number of Hello packets transmitted per interval. The count can be specified from 1 to 10. Default value = 3. This can enabled or disabled. When it is enabled it allows the forwarding of STP BPDU packets from other network devices when STP is disabled on the Switch. The default is enabled. 85