Installation manual

Operation Manual - STP
Quidway S3000-EI Series Ethernet Switches Chapter 1
MSTP Region-configuration
Huawei Technologies Proprietary
1-17
Perform the following configuration in system view.
Table 1-9 Configure the time parameters of a switch
Operation Command
Configure Forward Delay on the switch.
stp timer forward-delay centiseconds
Restore the default Forward Delay of
the switch.
undo stp timer forward-delay
Configure Hello Time on the switch.
stp timer hello centiseconds
Restore the default Hello Time on the
undo stp timer hello
switch.
Configure Max Age on the switch.
stp timer max-age centiseconds
Restore the default Max Age on the
switch.
undo stp timer max-age
Every switch on the switching network adopts the values of th
configured on the root switch of the CIST.
e time parameters
Caution:
z etwork
Generally, the Forward Delay is network
short bute some
rward Delay may prolong the
d.
z switch to dete but
s. Th
he switch may
er it as link fault and the network device will recalculate the spanning tree
accordingly. However, for too short a Hello Time, the switch frequently sends
network device frequently calculate the
n as link fault. However, if the Max Age is
too long, the network device may not be able to discover the link fault and
recalculate the spanning tree in time, which will weaken the auto-adaptation
capacity of the network. The default value is recommended.
The Forward Delay configured on a swit
diameter.
ch depends on the switching n
supposed to be longer when the
diameter is longer. Note that too a Forward Delay may redistri
redundant routes temporarily, while too long a Fo
network connection resuming. The defa
ult value is recommende
A suitable Hello Time ensures the
occupy moderate network resource
ct the link fault on the network
e default value is recommended. If you set
too long a Hello Time, when there is pa
consid
cket dropped over a link, t
configuration BPDU, which adds its burden and wastes the network resources.
z Too short a Max Age may cause the
spanning tree and mistake the congestio
To avoid frequent network flapping, the values of Hello Time, Forward Delay and
Maximum Age should guarantee the following formulas equal.