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NXA-ENET24 - Software Management Guide
Spanning Tree Commands (Cont.)
Command Function
spanning-tree edge-port
This command specifies an
interface as an edge port.
Use the no form to restore the
default.
Syntax:
[no] spanning-tree edge-port
Default Setting: Disabled
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 cur-
rent 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, remem-
ber 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.
Example:
Console(config)#interface ethernet ethernet 1/5
Console(config-if)#spanning-tree edge-port
Console(config-if)#
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 span-
ning-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 stan-
dard 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.
Example:
Console(config)#interface ethernet 1/5
Console(config-if)#spanning-tree portfast
Console(config-if)#