Reference Guide

800 | Rapid Spanning Tree Protocol (RSTP)
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Parameters
Defaults
15 seconds
Command Modes
CONFIGURATION RSTP (conf-rstp)
Command
History
Related
Commands
hello-time
z
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
History
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
seconds
Enter the number of seconds that FTOS waits before transitioning RSTP to the forwarding
state.
Range: 4 to 30
Default: 15 seconds
Version 9.0.2.0 Introduced on the S6000.
Version 8.3.11.1 Introduced on Z9000
hello-time Change the time interval between BPDUs.
max-age Change the wait time before RSTP refreshes protocol configuration information.
S6000
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 to 950 milliseconds
Version 9.0.2.0 Introduced on the S6000.
Version 8.3.11.1 Introduced on Z9000
Version 8.3.1.0
Added
milli-second to S-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.