D-Link DES-3226S, User Manual

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DES-3226S Layer 2 Fast Ethernet Switch User’s Guide
85
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 < Disabled > 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.
Max Age: (6 - 40 sec)
<
20 >
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.
Hello Time: (1 - 10
sec) <
2 >
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.
Forward Delay: (4 - 30
sec) <
15 >
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.
Priority: (0 - 61440)
<
32768 >
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.
STP Version < RSTP
>
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.
Tx Hold Count < 3 > This is the maximum number of Hello packets transmitted per interval. The count can be
specified from 1 to 10. Default value = 3.
Forwarding BPDU
<
Enabled >
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.