C
HAPTER
33
| Spanning Tree Commands
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COMMAND USAGE
â—† 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.
EXAMPLE
Console(config)#interface ethernet 1/5
Console(config-if)#spanning-tree edge-port
Console(config-if)#
spanning-tree link-
type
This command configures the link type for Rapid Spanning Tree and
Multiple Spanning Tree. Use the no form to restore the default.
SYNTAX
spanning-tree link-type {auto | point-to-point | shared}
no spanning-tree link-type
auto - Automatically derived from the duplex mode setting.
point-to-point - Point-to-point link.
shared - Shared medium.
DEFAULT SETTING
auto
COMMAND MODE
Interface Configuration (Ethernet, Port Channel)
COMMAND USAGE
â—† Specify a point-to-point link if the interface can only be connected to
exactly one other bridge, or a shared link if it can be connected to two
or more bridges.
â—† When automatic detection is selected, the switch derives the link type
from the duplex mode. A full-duplex interface is considered a point-to-
point link, while a half-duplex interface is assumed to be on a shared
link.
â—† RSTP only works on point-to-point links between two bridges. If you
designate a port as a shared link, RSTP is forbidden. Since MSTP is an
extension of RSTP, this same restriction applies.
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