3Com 3500 - Manual (Page 290)

290 C HAPTER 10: B RIDGE P ORT P ARAMETERS
✓ 3500
✓ 9000
✓ 9400
✓
3900
✓
9300
bridge port stpCost Sets the path cost that the Spanning Tree Protocol (STP) adds to the root
cost field in a configuration message that the port receives. The system
uses this value to determine the path cost to the root through the port.
The current value is shown in the pathCost field of the
bridge port
detail
display.
Valid Minimum Abbreviation
b po stpc
Important Considerations
■
You can use this command to configure the same setting on multiple
ports simultaneously. When you specify multiple port numbers, the
system prompts you to choose the setting and then applies it to all of
the ports.
■
A larger path cost value makes the LAN that is reached through the
port more likely to be low in the Spanning Tree topology. The lower
the LAN is in the topology, the less through traffic it carries. For this
reason, you may want to assign a large path cost to a LAN that has a
lower bandwidth or to one on which you want to minimize traffic.
■
If your configuration is successful, the previous menu appears. If the
configuration is not successful, the system notifies you that your
changes failed, and you can try to reenter your changes.
■
See the IEEE 802.1D MAC Bridges standard for recommended path
cost settings.
Options
Prompt Description Possible Values [Default]
Bridge ports Bridge ports for which you
want to set the path cost
One or more valid
bridge port
numbers –
STP cost Configurable bridge port STP
parameter that specifies the
cost to add to the total path
cost when this port is the root
port 1 – 65535
■
100
(Ethernet)
■
10 (Fast
Ethernet)
■
1 (Gigabit
Ethernet)