Stp Timer-Factor - HP A5830 Series Command Reference Manual

Syntax
stp [ vlan vlan-list ] timer max-age time
undo stp [ vlan vlan-list ] timer max-age
View
System view
Default level
2: System level
Parameters
vlan vlan-list: Specifies a VLAN list in the format of vlan-list = { vlan-id [ to vlan-id ] }&<1- 1 0>, where the
vlan-id parameter represents the VLAN ID, in the range of 1 to 4094, and &<1- 1 0> indicates that you can
specify up to 10 VLAN IDs or VLAN ID ranges.
time: Sets the max age in centiseconds, in the range of 600 to 4000 in increments of 100 (as in 600,
700, 800).
Examples
# In MSTP mode, set the max age timer to 1000 centiseconds.
<Sysname> system-view
[Sysname] stp timer max-age 1000
# In PVST mode, set the max age timer in VLAN 2 to 1000 centiseconds.
<Sysname> system-view
[Sysname] stp mode pvst
[Sysname] stp vlan 2 timer max-age 1000

stp timer-factor

Description
Use the stp timer-factor command to configure the timeout time by setting the timeout factor.
Timeout time = timeout factor × 3 × hello time.
Use the undo stp timer-factor command to restore the default.
By default, the timeout factor of the switch is set to 3.
After the network topology is stabilized, each non-root-bridge device forwards configuration BPDUs to the
surrounding devices at the interval of hello time to check whether any link is faulty. If a device does not
receive a BPDU from the upstream device within nine times the hello time, it will assume that the upstream
device has failed and start a new spanning tree calculation process.
In a stable network, this kind of spanning tree calculation may occur because the upstream device is
busy. You can avoid such unwanted spanning tree calculations by lengthening the timeout time (by setting
the timeout factor to 4 or more), saving the network resources. HP recommends you to set the timeout
factor to 5, 6, or 7 for a stable network.
Related commands: stp timer hello.
Syntax
stp timer-factor factor
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