Command Reference Guide

Rapid Spanning Tree Protocol (RSTP) | 1271
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hello-time
c e s
Set the time interval between generation of RSTP Data Units (BPDUs).
Syntax
hello-time [milli-second] seconds
To return to the default value, enter no hello-time.
Parameters
Defaults
2 seconds
Command Modes
CONFIGURATION RSTP (conf-rstp)
Command
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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 millisecond hellos are configured, the default hello interval of 2 seconds is still used for
edge ports; the millisecond hello interval is not used.
Related
Commands
Version 8.3.7.0 Introduced on S4810
Version 7.6.1.0 Support added for S-Series
Version 7.5.1.0 Support added for C-Series
Version 6.2.1.1 Introduced for E-Series
hello-time Change the time interval between BPDUs.
max-age Change the wait time before RSTP refreshes protocol configuration information.
seconds
Enter a number as the time interval between transmission of BPDUs.
Range: 1 to 10 seconds
Default: 2 seconds.
milli-second
Enter this keyword to configure a hello time on the order of milliseconds.
Range: 50 - 950 milliseconds
Version 8.3.7.0 Introduced on S4810
Version 8.3.1.0 Added milli-second to S-Series.
Version 7.6.1.0 Support added for S-Series
Version 7.5.1.0 Support added for C-Series
Version 6.2.1.1 Introduced for E-Series
forward-delay Change the wait time before RSTP transitions to the Forwarding state.
max-age Change the wait time before RSTP refreshes protocol configuration information.