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NB-30 Bridging
3-22 Bridge Spanning Tree
Topology
This indicates how many times the bridgeÕs Topology Change ßag has been
changed since the NB-30 was last powered-up or initialized. The Topology
Change ßag increments each time a bridge enters or leaves the network, or when
the Root Bridge ID changes. The Þeld also indicates the date and time at which the
topology last changed.
Configuring Spanning Tree
The Bridge Spanning Tree window allows you to update the following
parameters for your NB-30 bridge. When you have Þnished making changes to
the following individual parameters, you must click on Set at the bottom of the
Spanning Tree window to write the changes to the device.
Changing Bridge Priority
To change the part of the bridge address that contains the identiÞer used in the
Spanning Tree Algorithm for priority comparisons:
1. Highlight the Bridge Priority field.
2. Enter the new identifier, in hexadecimal format; the allowed range is 0-FFFF
hexadecimal.
3. Click on Set.
The selected Bridge Priority will be applied to the bridge (a lower number
indicates a higher priority in the root selection process).
Changing the Spanning Tree Algorithm Protocol Type
To change the type of protocol used in Spanning Tree:
1. Click the mouse on the appropriate option button: IEEE 802.1, DEC, or None.
2. Click on Set.
The selected Spanning Tree Algorithm protocol type will be applied to the bridge.
If you selected None, the Spanning Tree Algorithm will be disabled (if it already
was enabled). If STA Protocol Type was changed from None to IEEE 802.1 or DEC,
you must restart the bridge for the newly selected STA protocol to be applied.
NOTE
Any values you set at the bridge will cause a Topology Change ßag to be issued in the next
ConÞguration BPDUs it transmits. This will cause the bridged network to immediately
recalculate Spanning Tree and change topology accordingly.