Stp Root-Protection - 3Com S7906E Command Reference Manual

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:
If you do not provide instance instance-id, your configuration will take effect in the CIST instance
only.
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. 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 the root bridge or a secondary root bridge, you cannot
change the priority of the device.
Examples
# Specify the current device as the secondary root bridge of MSTI 0.
<Sysname> system-view
[Sysname] stp instance 0 root secondary

stp root-protection

Syntax
stp root-protection
undo stp root-protection
View
Ethernet port view, port group view, Layer-2 aggregate port view
Default Level
2: System level
Parameters
None
Description
Use the stp root-protection command to enable the root guard function on the port(s).
Use the undo stp root-protection command to disable the root guard function on the port(s).
By default, the root guard function is disabled.
Note that:
Configured in port view, the setting takes effect on the current port only; configured in port group
view, the setting takes effect on all ports in the port group.
Configured in Layer-2 aggregate port view, the setting takes effect only on the aggregate port.
Configured on the member port in an aggregation group, the setting can take effect only after the
port leaves the aggregation group. For detailed information about link aggregation, refer to Link
Aggregation Configuration in the Access Volume.
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