Stp Port Settings - D-Link xStack DGS-3420 Series Reference Manual

xStack® DGS-3420 Series Layer 2 Managed Stackable Gigabit Switch Web UI Reference Guide
Tx Hold Count (1-10)
Max Hops (6-40)
NNI BPDU Address
Click the Apply button to accept the changes made for each individual section.
NOTE: The Bridge Hello Time cannot be longer than the Bridge Max Age. Otherwise, a configuration
error will occur. Observe the following formulas when setting the above parameters:
Bridge Max Age <= 2 x (Bridge Forward Delay - 1 second)
Bridge Max Age > 2 x (Bridge Hello Time + 1 second)

STP Port Settings

STP can be set up on a port per port basis.
To view the following window, click L2 Features > Spanning Tree > STP Port Settings, as show below:
It is advisable to define an STP Group to correspond to a VLAN group of ports.
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.
Used to set the number of hops between devices in a spanning tree region before the
BPDU (bridge protocol data unit) packet sent by the Switch will be discarded. Each
switch on the hop count will reduce the hop count by one until the value reaches zero.
The Switch will then discard the BDPU packet and the information held for the port will
age out. The user may set a hop count from 6 to 40. The default is 20.
Used to determine the BPDU protocol address for GVRP in service provide site. It can
use 802.1d GVRP address, 802.1ad service provider GVRP address or a user defined
multicast address. The range of the user defined address is 0180C2000000 -
0180C2FFFFFF.
Figure 4-37 STP Port Settings window
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