Users Guide

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, see the relevant Dell Networking
OS Command Line Reference Guide.
Version Description
9.8(1.0) Introduced on the Z9100-ON.
9.8(0.0P5) Introduced on the S4048-ON.
9.8(0.0P2) Introduced on the S3048-ON.
9.7(0.0) Introduced on the S6000-ON.
9.2(1.0) Introduced on the Z9500.
9.0.2.0 Introduced on the S6000.
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.
Syntax
max-age seconds
To return to the default values, use the no max-age command.
Rapid Spanning Tree Protocol (RSTP) 1343