Reference Guide

Version 7.5.1.0 Introduced on the C-Series.
Version 6.2.1.1 Introduced on the E-Series.
Related
Commands
hello-time — changes the time interval between BPDUs.
max-age — changes the wait time before RSTP refreshes the protocol configuration
information.
hello-time
Set the time interval between the generation of the RSTP bridge protocol data units (BPDUs).
S4820T
Syntax
hello-time [milli-second] seconds
To return to the default value, use the no hello-time command.
Parameters
seconds Enter a number as the time interval between transmission of BPDUs.
The range is from 1 to 10 seconds. The default is 2 seconds.
milli-second Enter the keywords milli-second to configure a hello time on the
order of milliseconds. The range is from 50 to 950 milliseconds
Defaults 2 seconds
Command Modes CONFIGURATION RSTP (conf-rstp)
Command History
This guide is platform-specific. For command information about other platforms, refer to the
relevant FTOS Command Line Reference Guide .
The following is a list of the FTOS version history for this command.
Version 8.3.19.0 Introduced on the S4820T.
Version 8.3.11.1 Introduced on the Z9000.
Version 8.3.7.0 Introduced on the S4810.
Version 8.3.1.0 Added the milli-second option to the S-Series.
Version 7.6.1.0 Introduced on the S-Series.
Version 7.5.1.0 Introduced on the C-Series.
Version 6.2.1.1 Introduced on the E-Series.
Usage
Information
The hello time is encoded in BPDUs in increments of 1/256ths of a second. The standard
minimum hello time in seconds is 1 second, which is encoded as 256. Millisecond hello times
are encoded using values less than 256; the millisecond hello time equals (x/1000)*256.
When you configure millisecond hellos, the default hello interval of 2 seconds is still used for
edge ports; the millisecond hello interval is not used.
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