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Bridge Spanning Tree 5-19
Bridging
Changing Bridge Priority
To change the part of the bridge address that contains the identifier 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.
Changing Hello Time
If the bridge is the Root Bridge, or is attempting to become the Root, and you
want to change the length of time the bridge waits between sending configuration
BPDUs:
1. Highlight the Hello Time field, and type in a new value.
2. Click on Set.
The IEEE 802.1d specification recommends that Hello Time = 2 seconds; the
allowable range is 1 to 10 seconds.
NOTE
Any values you set at the bridge will cause a Topology Change flag to be issued in the next
Configuration BPDUs it transmits. This will cause the bridged network to immediately
recalculate Spanning Tree and change topology accordingly.
!
CAUTION
All bridges in a network must use the same Spanning Tree version. Mixing Spanning Tree
Algorithm protocols will cause an unstable network.