Chapter 17
| Spanning Tree Commands
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Command Mode
Interface Configuration (Ethernet, Port Channel)
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.
â—† When edge port is set as auto, the operational state is determined
automatically by the Bridge Detection State Machine described in 802.1D-2004,
where the edge port state may change dynamically based on environment
changes (e.g., receiving a BPDU or not within the required interval).
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.
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