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Allied Telesis AT-S41 User Manual

Page 83

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AT-S41 User’s Guide

83

The root bridge will periodically transmit a BPDU to determine whether
there have been any changes to the network topology and to inform
other bridges of topology changes. The frequency with which the root
bridge sends out a BPDU is called the Hello Time. This is a value that you
can set on the AT-8326GB Fast Ethernet switches. The interval is
measured in seconds and the default is 2 seconds. Consequently, if an
AT-8326GB switch is selected as the root bridge of a spanning tree
domain, it will transmit a BPDU every 2 seconds.