Stp Root Secondary; Stp Root-Protection - H3C S5120-SI Series Command Reference Manual

Related commands: stp priority, stp root secondary.
Examples
# Specify the current device as the root bridge of MSTI 0.
<Sysname> system-view
[Sysname] stp instance 0 root primary

stp root secondary

Syntax
stp [ instance instance-id ] root secondary
undo stp [ instance instance-id ] root
View
System view
Default Level
2: System level
Parameters
instance instance-id: Configures the device as a secondary root bridge in a particular MSTI. The
minimum value of instance-id is 0, representing the CIST, and the maximum value of instance-id is 3.
Description
Use the stp root secondary command to configure the device as a secondary root bridge.
Use the undo stp root command to restore the system default.
By default, a device is not a secondary root bridge.
Note that:
You can configure one or more secondary root bridges for each MSTI. When the root bridge of an
MSTI fails or is shut down, the secondary root bridge can take over the role of the root bridge of the
specified MSTI. However, if you specify a new primary root bridge for the instance then, the
secondary root bridge will not become the root bridge. If you specify more than one secondary root
bridge, the secondary root bridge with the lowest MAC address will become the root bridge.
After specifying the current device as a secondary root bridge, you cannot change the priority of the
device.
Related commands: stp priority, stp root primary.
Examples
# Specify the current device as a secondary root bridge of MSTI 0.
<Sysname> system-view
[Sysname] stp instance 0 root secondary

stp root-protection

Syntax
stp root-protection
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