Configure The Switching Network Diameter; Configure The Time Parameters Of A Switch - Huawei Quidway S3000 Series Operation Manual

Operation Manual - STP
Quidway S3000 Series Ethernet Switches
The more the hops in an MST region, the larger the scale of the region. Only the max
hops configured on the region root can limit the scale of MST region. Other switches in
the MST region also apply the configurations on the region root, even if they have been
configured with max hops.
By default, the max hops of an MST is 20.

2.2.6 Configure the Switching Network Diameter

Any two hosts on the switching network are connected with a specific path carried by a
series of switches. Among these paths, the one passing more switches than all others
is the network diameter, expressed as the number of passed switches.
You can use the following command to configure the diameter of the switching network.
Perform the following configuration in system view.
Table2-8 Configure the switching network diameter
Configure the switching network diameter.
Restore the default switching network diameter.
The network diameter is the parameter specifying the network scale. The larger the
diameter, the lager the scale.
When a user configures the network diameter on a switch, MSTP automatically
calculates and sets the hello time, forward-delay time and maximum-age time of the
switch to the desirable values.
Setting the network diameter takes effect on CIST only, but has no effect on MSTI.
By default, the network diameter is 7 and the three corresponding timers take the
default values.

2.2.7 Configure the Time Parameters of a Switch

The switch has three time parameters, Forward Delay, Hello Time, and Max Age.
Forward Delay is the switch state transition mechanism. The spanning tree will be
recalculated upon link faults and its structure will change accordingly. However, the
configuration BPDU recalculated cannot be immediately propagated throughout the
network. The temporary loops may occur if the new root port and designated port
forward data right after being elected. Therefore the protocol adopts a state transition
mechanism. It takes a Forward Delay interval for the root port and designated port to
transit from the learning state to forwarding state. The Forward Delay guarantees a
Operation
2-16
Chapter 1 RSTP Configuration
Command
stp bridge-diameter bridgenum
undo stp bridge-diameter