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802.1w Rapid Spanning Tree Protocol (RSTP) 802.1d Spanning Tree Protocol (STP)
802.1p Spanning-Tree Protocol (STP)
This command enables STP with the current parameter settings or disables
STP without losing the most-recently configured parameter settings. (To learn
how the switch handles parameter changes, how to test changes without
losing the previous settings, and how to replace previous settings with new
settings, see
Chapter 5, “Switch Memory and Configuration”.) When enabling
STP, you can also include the STP general and per-port parameters described
in the next two sections. When you use the “no” form of the command, you
can do so only to disable STP. (STP parameter settings are not changed when
you disable STP.)
Caution Because incorrect STP settings can adversely affect network performance,
HP recommends that you use the default STP parameter settings. You should
not change these settings unless you have a strong understanding of how STP
operates. For more on STP, see the IEEE 802.1d standard.
Reconfiguring General STP Operation on the Switch. You can config-
ure one or more of the following parameters:
Table 13-3.General STP Operating Parameters
Name Default Range Function
priority 32768 0 - 65535 Specifies the priority value used along with the
switch MAC address to determine which device is
root. The lower a priority value, the higher the
priority.
*maximum-age 20 seconds 6 - 40 Maximum received message age the switch
seconds allows for STP information before discarding the
message.
*hello-time 2 seconds 1 - 10 Time between messages transmitted when the
switch is the root.
*forward-delay 15 seconds 4 - 30
seconds
Time the switch waits before transitioning from the
listening to the learning state, and between the
learning state to the forwarding state.
*The switch uses its own maximum-age, hello-time, and forward-delay settings only if it is
operating as the root device. If another device is operating as the root device, then the switch
uses the other device’s settings for these parameters.
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