Stp Timer Forward-Delay - HP 3600 v2 Series Command Reference Manual

[Sysname] undo stp enable
[Sysname] stp tc-snooping

stp timer forward-delay

Syntax
stp [ vlan vlan-list ] timer forward-delay time
undo stp [ vlan vlan-list ] timer forward-delay
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 argument 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 forward delay in 0.01 seconds, in the range of 400 to 3000 in increments of 100 (as in
400, 500, 600).
Description
Use stp timer forward-delay to set the forward delay timer of the device.
Use undo stp timer forward-delay to restore the default.
By default, the forward delay timer is 15 seconds.
The forward delay timer determines the time interval of state transition. To prevent temporary loops, a
spanning tree port goes through the learning (intermediate) state before it transits from the discarding to
the forwarding state. To stay synchronized with the remote device, the port has a wait period between
transition states that is determined by the forward delay timer.
To set the forward delay in STP/RSTP/MSTP mode, use this command without any VLAN specified. To set
the forward delay for a specific VLAN or multiple VLANs in PVST mode, use this command with a VLAN
list specified.
HP does not recommend that you set the forward delay with this command. Instead, you can specify the
network diameter of the switched network by using the stp bridge-diameter command and let spanning
tree protocols automatically calculate optimal settings of the forward delay timer. If the network diameter
uses the default value, the forward delay timer also uses the default value.
Related commands: stp timer hello, stp timer max-age, and stp bridge-diameter.
Examples
# In MSTP mode, set the forward delay timer to 20 seconds.
<Sysname> system-view
[Sysname] stp timer forward-delay 2000
# In PVST mode, set the forward delay timer to 20 seconds.
<Sysname> system-view
[Sysname] stp mode pvst
[Sysname] stp vlan 2 timer forward-delay 2000
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