Administrator Guide

hello-time
Set the time interval between the generation of the RSTP bridge protocol data units (BPDUs).
C9000 Series
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 Dell
Networking OS Command Line Reference Guide.
The following is a list of the Dell Networking OS version history for this command.
Version Description
9.9(0.0) Introduced on the C9010.
9.2(1.0) Introduced on the Z9500.
8.3.19.0 Introduced on the S4820T.
8.3.11.1 Introduced on the Z9000.
8.3.7.0 Introduced on the S4810.
8.3.1.0 Added the milli-second option to the S-Series.
7.6.1.0 Introduced on the S-Series.
7.5.1.0 Introduced on the C-Series.
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.
Related
Commands
forward-delay — changes the wait time before RSTP transitions to the Forwarding state.
max-age — changes the wait time before RSTP refreshes the protocol configuration information.
max-age
To maintain configuration information before refreshing that information, set the time interval for the RSTP bridge.
C9000 Series
Syntax
max-age seconds
To return to the default values, use the no max-age command.
Rapid Spanning Tree Protocol (RSTP) 1401