Chapter 17
| Spanning Tree Commands
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Command Usage
◆
This command is used by the Spanning Tree Algorithm to determine the
best path between devices. Therefore, lower values should be assigned to
ports attached to faster media, and higher values assigned to ports with
slower media.
◆
Path cost takes precedence over port priority.
◆
When the path cost method (
) is set to short, the maximum value
for path cost is 65,535.
Example
Console(config)#interface ethernet 1/5
Console(config-if)#spanning-tree cost 50
Console(config-if)#
spanning-tree
edge-port
This command specifies an interface as an edge port. Use the
no
form to
restore the default.
Syntax
spanning-tree
edge-port
[
auto
]
no
spanning-tree
edge-port
auto
- Automatically determines if an interface is an edge port.
Default Setting
Auto
Command Mode
Interface Configuration (Ethernet, Port Channel)
Command Usage
◆
You can enable this option if an interface is attached to a LAN segment
that is at the end of a bridged LAN or to an end node. Since end nodes
cannot cause forwarding loops, they can pass directly through to the
spanning tree forwarding state. Specifying Edge Ports provides quicker
convergence for devices such as workstations or servers, retains the
current forwarding database to reduce the amount of frame flooding
required to rebuild address tables during reconfiguration events, does not
cause the spanning tree to initiate reconfiguration when the interface
changes state, and also overcomes other STA-related time out problems.
However, remember that Edge Port should only be enabled for ports
connected to an end-node device.
