Alcatel Omni Switch/Router, User Manual

Page: 476 / 1100

Configuring Spanning Tree
Page 17-28
Display Spanning Tree Bridge Parameters
The
sts
command allows you to display spanning tree bridge parameters. To display
spanning tree parameters, enter the
sts
command as shown:
sts <groupNumber>
where
<groupNumber>
is the number of the group in the switch for which you want to view
spanning tree bridge parameters. For example, to view parameters for Group 2, you would
enter:
sts 2
A screen similar to the following is displayed:
Spanning Tree Parameters for Group 2 (New GROUP (#2))
Spanning Tree Status : ON
Fast Spanning Tree Status: OFF
Bridge Protocol Use : IEE E 802.1D
Priority : 32768 (0x8000)
Bridge ID : 8000-0020DA:022860
Designated Root : 8000-0020DA:022860
Cost to Root Bridge : 0
Root Port : None
Next Best Root Cost : 0
Next Best Root Port : None
Hold Time : 1
Topology Changes : 1
Last Topology Change : 1 hours, 25 minutes, 54 seconds ago
Bridge Aging Timer : 300
Parameters system uses when
Current Parameters attempt to become root
--------------------------------------------------------- -----------------------------------------------------
Max Age 20 secs System Max Age 20 secs
Forward Delay 15 sec System Forward Delay 15 secs
Hello Time 2 secs System Hello Time 2 secs
As a variation of this command, you can enter
sts
at the system prompt without specifying a
group. This will display bridge parameters for the currently selected group. For information
on selecting a group, see
Selecting a Default Group on page 17-7.
Field Descriptions
The following sections describe the fields displayed using the
sts
command.
Spanning Tree Status
. Spanning tree is either
ON
or
OFF
.
Fast Spanning Tree Status
. Fast spanning tree is either
ON
or
OFF
.
Bridge Protocol Used.
The bridge spanning tree protocol is set up through the
stc
command.
This protocol can be IEEE 802.1D or IBM Spanning Tree. The type of spanning tree protocol
used will affect other bridge parameters, such as
Maximum Age
,
Forwarding Delay
, and
Hello
Time
. See Configuring Spanning Tree Parameters on page 17-25 for more information on the
differences between IEEE and IBM Spanning Tree.
Priority.
Bridge priority is utilized by the spanning tree algorithm to decide which bridge will
be the root bridge. You can set the bridge priority by entering a decimal number from 0 to
65,535. Zero is the highest priority.
Bridge ID.
The bridge identification number is a number created by concatenating the bridge
Priority
with its six-byte MAC address.