Installation manual

Operation Manual - STP
Quidway S3000-EI Series Ethernet Switches Chapter 1
MSTP Region-configuration
Huawei Technologies Proprietary
1-13
instance instance-id ] root
secondary [ bridge-diameter
[ hello-time
centi-senconds ]
Specify current switch as the secondary
stp [
root switch of the specified spanning
tree.
bridgenum ]
Specify current switch n t to be the o
primary or secondary root.
undo stp [ instance instance-id ] root
A s r
m
Y n configure the current switch as the p ry root switch of the STI
( nt
s ary or seconda
he root types of a switch in different STIs are independent of one another. The switch
If the primary root is down or powered off, the secondary root will take its place, unless
“Configure switching network diameter” and
“Configure the Hello Time of the switch”.
fter a switch is configured as primary root
odify the bridge priority of the switch.
ou ca
witch or secondary root switch, use can’t
rimary or seconda
specified by the instance instance-id param
witch is specified as the prim
eter). If the instance-id takes 0, the curre
ry root switch of the CIST.
T
can be a primary or secondary root of any STI. However, it cannot serve as both the
primary and secondary roots of one STI.
you configure a new primary root. Of two or more configured secondary root switches,
MSTP selects the one with the smallest MAC address to take the place of the failed
primary root.
When configuring the primary and secondary switches, you can also configure the
network diameter and hello time of the specified switching network. For detailed
information, refer to the configuration tasks
 Note:
z You can configure the current switch as the root of several STIs, however, it is not
o or more switches.
z Generally, you are recommended to designate one primary root and more than one
secondary roots for a spanning tree.
necessary to specify two or more roots for an STI. In other words, please do not
specify the root for an STI on two or more switches.
z You can configure more than one secondary root for a spanning tree through
specifying the secondary STI root on tw
By default, a switch is neither the primary root or the secondary root of the spanning
tree.