| Spanning | |
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Field | Description |
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Bridge Maximum | Configurable field; the maximum permissible age, in | |
Age | seconds, provided by the current root bridge for | |
| Spanning Tree configuration information to remain | |
| active on the selected bridge. | |
| When the | |
| received any BPDUs, it discards the current Spanning | |
| Tree information and initiates a new round of Span- | |
| ning Tree configuration. | |
| The recommended IEEE 802.1d time is 20s (twenty | |
| seconds). | |
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Bridge Hello Time | Configurable field; the amount of time, in seconds, | |
| provided by the current root bridge between trans- | |
| missions of configuration BPDUs. This timer works | |
| with the Spanning Tree Hold Time, which should be | |
| greater than the Hello Time. | |
| If it is smaller, the Spanning Tree algorithm responds | |
| more quickly to configuration changes, resulting in | |
| increased network traffic. | |
| The recommended IEEE 802.1d time is 2s (two sec- | |
| onds). | |
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Bridge Forward | Configurable field; the delay time, in seconds, pro- | |
Delay | vided by the current root bridge before a bridge starts | |
| forwarding data packets. | |
| The recommended IEEE 802.1d time is 15s (15 sec- | |
| onds). | |
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Time Since Topol- | ||
ogy Change | topology was changed. | |
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Number Topology | ||
Changes | changes that have occurred. | |
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