xStack® DES-3528/DES-3552 Series Layer 2 Managed Stackable Fast Ethernet Switch Web UI Reference Guide
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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.
Max Hops (6-40)
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.
NNI BPDU Address
Configure NNI port address.
dot1d – Specifies GVRP’s BPDU MAC address of NNI port using the definition of
802.1d.
dot1ad – Specifies GVRP’s BPDU MAC address of NNI port using the definition of
802.1ad.
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)
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 shown below:
Figure 4-29 STP Port Settings window
It is advisable to define an STP Group to correspond to a VLAN group of ports.
The fields that can be configured are described below:
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