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Configuring Fast Spanning Tree
Page 17-36
Displaying Fast Spanning Tree Port Parameters
The fstps command allows you to view the current Fast Spanning Tree port parameters on a
selected group or VLAN. To view the port parameters, enter the fstps command as shown:
fstps <groupNumber>
where <groupNumber> is the number of the group in the switch for which you want to view
Fast Spanning Tree port parameters. For example, to view parameters for Group 1, enter:
fstps 1
If Fast Spanning Tree is not enabled (default), a screen similar to the following will appear:
Fast Spanning Tree not enabled for Group 1 (Default GROUP (#1))
Primary Port
Slot Service Slot Service
Intf Inst State Role Fwrds Frwdr FrgetRPs PPs Link Ups Intf Inst
----- --------------------------------------------------- ------ ------ ---- ----------- ---- ----------
8/3 Brg/ 1 FORWD ROOT 0 0 0 0 0 2
As a variation on this command, you can enter fstps 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.
The fields displayed by the
fstps command include.
Slot/Intf. The slot and interface (port) number of the port.
Service/Inst. The service type and instance of the service connected to the port.
State. The port's current state as defined by application of the fast spanning tree protocol.
This state controls what action a port takes on reception of a frame. The State values include:
DSABL Disabled - The port has been disabled.
BLOCK Blocking - The port is not participating in transmitting data in order to
prevent loops.
LISTN Listening - The port is preparing to transmit data, but is temporarily
disabled in order to prevent loops. BPDU processing does occur, but no
user data is being passed.
LEARN Learning - The port is preparing to transmit data, adding source MAC
addresses to the bridging table, but incoming data frames are dropped.
FORWD Forwarding - The port is transmitting data. This state applies to Root
Ports and Designated Ports.
FRWDS Forwards - The port is transmitting data. This state applies to Designated
Ports, and monitors old root ports for a period equivalent to two times
the Forward Delay Timer default time period (default = 15 seconds).
FRWDR Forwarder - The port is transmitting data. This state applies to
Designated Ports, and monitors old root ports for a period equivalent to
the Forward Delay Timer default time period (default = 15 seconds).
FRGET Forgetting - The port is discarding frames, and is not learning source
addresses. This state applies to prior Designated Ports that are placed
into an Alternate Role. Forgetting State minimizes potential denial of
service due to information races during extensive reconfigurations.