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xStack
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.
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:
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
From Port / To Port
External Cost (0=Auto)
P2P
DES-3810 Series Layer 3 Managed Ethernet Switch Web UI Reference Guide
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.
Here the user can enter the NNI BPDU Address used. Among the options, the user can
select either Dot1d or Dot1ad.
Figure 5-34 STP Port Settings window
Description
Select a range of ports to be configured.
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.
Choosing the True parameter indicates a point-to-point (P2P) shared link. P2P ports are
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