User Manual

204
Users Manual of XGS-6350-24X4C
or multiple switches to the secondary roots or the backup roots. If the root does not function for certain
reasons, the secondary roots will become the network root.
Different from the primary root configuration, after the command to configure the primary root is run, MSTP
sets the spanning tree priority of the switch to 28672. In the case that the priority value of other switches is the
default value 32768, the current switch can be the secondary root.
When configuring the secondary root, you can run the subcommands diameter and hello-time to update the
STP time parameters. When the secondary root becomes the primary root and starts working, all these
parameters starts functioning.
Run the following command to set the switch to the secondary root of the network:
Command Purpose
spanning-tree mstpinstance-idroot
secondary
[ diameternet-diameter
[ hello-timeseconds ] ]
Sets the switch to the secondary root in the
designated spanning tree instance.
instance-id represents the number of the spanning
tree instance, ranging from 0 to 15.
net-diameter represents the network diameter,
which is an optional parameter. It is effective when
instance-id is 0. It ranges from 2 to 7.
seconds represents the unit of the hello time,
ranging from 1 to 10.
no spanning-tree mstpinstance-idroot
Cancels the root configuration of the switch in the
spanning tree.
instance-id means the number of the spanning tree
instance, ranging from 0 to 15.
Run the following command to check the MSTP message:
Command Purpose
show spanning-tree mstp
[ instanceinstance-id ]
Checks the message about the MST instance.
19.2.3.6 Configuring Bridge Priority
In some cases, you can directly set the switch to the network root by configuring the bridge priority. It means
that you can set the switch to the network root without running the subcommand root. The priority value of the
switch is independent in each spanning tree instance. Therefore, the priority of the switch can be set
independently.
Run the following command to configure the priority of the spanning tree:
Command Purpose
spanning-tree
mstpinstance-idpriorityvalue
Sets the priority of the switch.
instance-id represents the number of the spanning
tree instance, ranging from 0 to 15.