stp timer hello

Syntax

stp [ vlan vlan-list ] timer hello time

undo stp [ vlan vlan-list ] timer hello

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 ] }&<1-10>, where the vlan-id argument represents the VLAN ID, in the range of 1 to 4094, and &<1-10> indicates that you can specify up to 10 VLAN IDs or VLAN ID ranges.

time: Sets the hello time in 0.01 seconds, in the range of 100 to 1000 in increments of 100 (as in 100, 200, 300).

Description

Use stp timer hello to set the hello time of the device.

Use undo stp timer hello to restore the default.

By default, the hello time is 2 seconds.

Hello time is the time interval at which spanning tree devices send configuration BPDUs to maintain spanning tree. If a device fails to receive configuration BPDUs within the set period of time, a new spanning tree calculation process will be triggered due to timeout.

To set the hello time in STP/RSTP/MSTP mode, use this command without any VLAN specified. To set the hello time for a specific VLAN or multiple VLANs in PVST mode, use this command with a VLAN list specified.

Hewlett Packard Enterprise does not recommend that you set the hello time 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 hello timer. If the network diameter uses the default value, the hello timer also uses the default value.

Related commands: stp timer forward-delay, stp timer max-age, and stp bridge-diameter.

Examples

# In MSTP mode, set the hello time to 4 seconds.

<Sysname> system-view
[Sysname] stp timer hello 400

# In PVST mode, set the hello time in VLAN 2 to 4 seconds.

<Sysname> system-view
[Sysname] stp mode pvst
[Sysname] stp vlan 2 timer hello 400