Spanning Tree Commands
4-133
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 timeout problems. However, remember that Edge Port should only
be enabled for ports connected to an end-node device.
• This command has the same effect as the spanning-tree portfast command.
Example
Related Commands
spanning-tree portfast (4-133)
spanning-tree portfast
This command sets an interface to fast forwarding. Use the no form to disable fast
forwarding.
Syntax
[no] spanning-tree portfast
Default Setting
Disabled
Command Mode
Interface Configuration (Ethernet, Port Channel)
Command Usage
• This command is used to enable/disable the fast spanning-tree mode for the
selected port. In this mode, ports skip the Discarding and Learning states, and
proceed straight to Forwarding.
• Since end-nodes cannot cause forwarding loops, they can be passed through
the spanning tree state changes more quickly than allowed by standard
convergence time. Fast forwarding can achieve quicker convergence for
end-node workstations and servers, and also overcome other STA related
timeout problems. (Remember that fast forwarding should only be enabled for
ports connected to a LAN segment that is at the end of a bridged LAN or for an
end-node device.)
• This command is the same as spanning-tree edge-port, and is only included
for backward compatibility with earlier products. Note that this command may
be removed for future software versions.
Console(config)#interface ethernet ethernet 1/5
Console(config-if)#spanning-tree edge-port
Console(config-if)#
