Chapter 18
| Spanning Tree Commands
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Command Usage
â—† 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.
â—† Path cost takes precedence over port priority.
â—† When the path cost method (page 443) 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.
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