H3C S7500 Series Operation Manual page 255

Operation Manual – MSTP
H3C S7500 Series Ethernet Switches
Enter system view
Specify the current switch
as the root bridge of a
specified MSTI
II. Secondary root bridge configuration
Follow these steps to specify the current switch as the secondary root bridge of a
specified MSTI:
Enter system view
Specify the current switch
as the secondary root
bridge of a specified MSTI
Use the stp root primary/stp root secondary command to specify a switch as the root
bridge or the secondary root bridge of the MSTI identified by the instance-id argument.
If the value of the instance-id argument is set to 0, the stp root primary/stp root
secondary command specify the current switch as the root bridge or the secondary
root bridge of the CIST.
A switch can play different roles in different MSTIs. That is, it can be the root bridges in
a MSTI and be a secondary root bridge in another MSTI at the same time. But in one
MSTI, a switch cannot be the root bridge and the secondary root bridge simultaneously.
When the root bridge fails or is turned off, the secondary root bridge becomes the root
bridge if no new root bridge is configured. If you configure multiple secondary root
bridges for a MSTI, the one with the least MAC address replaces the root bridge when
the latter fails.
You can specify the network diameter and the Hello time parameters while configuring
a root bridge/secondary root bridge. Refer to section
Configuration" and
network diameter parameter and the Hello time parameter.
To do ...
system-view
stp [ instance instance-id ] root
primary [ bridge-diameter
bridgenumber ] [ hello-time
centi-seconds ]
To do ...
system-view
stp [ instance instance-id ] root
secondary [ bridge-diameter
bridgenumber ] [ hello-time
centi-seconds ]
1.2.8 "MSTP Time-related
Use the command ...
Use the command ...
Configuration" for information about the
1-11
Chapter 1 MSTP Configuration
Remarks
—
Required
Remarks
—
Required
1.2.7 "Network Diameter