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Page 5-2
How It Works
All bridges on the network communicate with each other using special packets
called Bridge Protocol Data Units (BPDUs). The information exchanged in the
BPDUs enables bridges on the network to:
❑ Elect a single bridge to be the Root Bridge.
❑ Calculate the shortest path from each bridge to the root.
❑ Select a Designated Bridge on each segment which lies closest to the
root, and will forward traffic to the root.
❑ Select a port on each bridge to forward traffic to the root.
❑ Select the ports on each bridge which will forward traffic, and place
the redundant ports in blocking state.
Enabling and Disabling STP
The IntraChassis 9000 is shipped with Spanning Tree enabled on all ports. It
can be manually enabled or disabled following the instructions below
To enable or disable STP on your IntraChassis 9000, use the following
procedure.
1 Type c to open the Configuration Menu.
2 Open the Spanning Tree Configuration Menu by typing s
in the Configuration Menu. See Figure 5-1.
3 Type t to toggle STP to enabled or disabled.
4 If you select disabled, you are prompted to confirm the
change.
The STP status is changed. The status is displayed near the
top of the Spanning Tree Configuration menu.
Configuring Spanning Tree Parameters
To view the Spanning Tree Configuration menu, as shown in Figure 5-1, type s
in the Configuration menu.
GLXY9.book Page 2 Thursday, February 17, 2000 3:04 PM