xStack® DGS-3120 Series Managed Switch Web UI Reference Guide
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NNI BPDU Address
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.
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:
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:
Parameter
Description
Unit
Select the unit you want to configure.
From Port / To Port
Select the starting and ending ports to be configured.
External Cost
(0=Auto)
This 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). Setting
0
for the external cost will automatically set the speed for
forwarding packets to the specified port(s) in the list for optimal efficiency. The default
port cost for a 100Mbps port is
200000
and the default port cost for a Gigabit port is
20000
. Enter a value between
1
and
200000000
to determine the External Cost. The
lower the number, the greater the probability the port will be chosen to forward
packets.
Summary of Contents for xStack DGS-3120-24TC
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