Alcatel Carrier Internetworking Solutions Switch/Router Manuale Utente

Page 17-32

Allows you to manually set the state for each port (forwarding or blocking) or defer the port’s 
state configuration to the spanning tree protocol, which will either be IEEE 802.1d or IBM. 
This column is especially helpful if you are using the IBM Spanning Tree protocol with non-
Token Ring (e.g., FDDI or Ethernet) ports that do not support this IBM Spanning Tree. In this 
situation you can manually set those ports to a forwarding (or blocking) state since the IBM 
Spanning Tree protocol will not be able to control these ports. The possible settings for this 
column are:

The port is in forwarding state and remains so unless you change it.

The port is in blocking state and remains so unless you change it.

The state of the port is determined by the IEEE 802.1d Spanning Tree 
protocol. This option is not recommended because it means this Group 
will have a hybrid spanning tree algorithm that mixes the IEEE 802.1d 
and IBM Spanning Tree.

The 

 command allows you to view the current spanning tree port parameters. To view the 

port parameters, enter the 

 command as shown:

where 

 is the number of the group in the switch for which you want to view 

spanning tree port parameters. For example, to view parameters for Group 1, you would 
enter:

A screen similar to the following is shown:

As a variation to this command, you can enter 

 at the system prompt without specifying a 

group number. This will allow you to view the port parameters on the currently selected 
group. For information on how to select a group, see Selecting a Default Group on page 17-7.