Sets the interval between the hello Bridge Protocol Data Units (BPDUs) sent on an interface.
2 seconds
Spanning tree configuration mode
This command configures the spanning-tree bridge hello time, which determines how often the device broadcasts hello messages to other devices.
If the VLAN parameter is not provided, the hello-time value is applied globally for all per-VLAN instances. But for the VLANs which have been configured explicitly, the per-VLAN configuration takes precedence over the global configuration. When configuring the hello-time, the max-age command setting must be greater than the hello-time setting. The following relationship should be kept:
(2 × (forward-delay - 1)) >= max-age >= (2 × (hello-time + 1))
Enter no hello-time to return to the default settings.
The command is the same regardless of which type of STP is enabled.
To configure spanning tree bridge hello time to 5 seconds:
device# configure terminal device(config)# protocol spanning-tree stp device(conf-stp)# hello-time 5 device# configure terminal device(config)# protocol spanning-tree rstp device(conf-rstp)# hello-time 5 device# configure terminal device(config)# protocol spanning-tree mstp device(conf-mstp)# hello-time 5 device# configure terminal device(config)# protocol spanning-tree pvst device(conf-pvst)# hello-time 5 device# configure terminal device(config)# protocol spanning-tree rpvst device(conf-rpvst)# hello-time 5