D-Link DGS-1210/ME User Manual page 61
Metro ethernet switch series
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4 Configuration
Spanning Tree Protocol: Specify the Spanning Tree Protocol to be Enabled or Disabled.
STP Version: You can choose MSTP, RSTP or STP Compatible. The default setting is MSTP.
Bridge Priority: This value between 0 and 61410 specifies the priority for forwarding packets: the lower the
value, the higher the priority. The default is 32768.
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 6.
Maximum Age (6-40 sec): This value 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 the Switch has the lowest Bridge Identifier, it will become the
Root Bridge. A time interval may be chosen between 6 and 40 seconds. The default value is 20. (Max Age
has to have a value bigger than Hello Time)
Hello Time (1-10 sec): The user may set the time interval between transmissions of configuration messages
by the root device, thus stating that the Switch is still functioning. The default is 2 seconds.
Forward Delay (4-30 sec): This sets the maximum amount of time that the root device will wait before
changing states. The default is 15 seconds.
Forwarding BPDU: Bridges use Bridge Protocol Data Units (BPDU) to provide spanning tree information.
STP BPDUs filtering is useful when a bridge interconnects two regions; each region needing a separate
spanning tree. BPDU filtering functions only when STP is disabled either globally or on a single interface.
Enabled - BPDU filtering is enabled on the port.
Disabled - BPDU forwarding is enabled on the port (if STP is disabled).
Root Bridge: Displays the MAC address of the Root Bridge.
Root Cost: Defines a metric that indicates the relative cost of forwarding packets to the specified port list.
Port cost can be set automatically or as a metric value. The default value is 0 (auto).
Root Maximum Age: Displays the Maximum Age of the Root Bridge. The default is 20.
Root Forward Delay: Displays the Forward Delay of the Root Bridge. The default is 15.
Root port: Displays the root port.
Click Apply for the settings to take effect. Click Refresh to renew the page.
Figure 4.87 - Configuration > Spanning Tree > STP Bridge Global Settings
DGS-1210 series Metro Ethernet Managed Switch User Manual
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