H3C S7500 Series Ethernet Switches Operation Manual

Operation Manual – MSTP
H3C S7500 Series Ethernet Switches Chapter 1
MSTP Configuration
1-12
 Note:
z You can configure a switch as the root bridge of multiple MSTIs. But you cannot
configure two or mo
re root bridges for one MSTI. So, do not configure root bridge for
the same MSTI on two or more switches using the stp root primary command.
z You can configure multiple secondary root bridges for one MSTI. That is, you can
configure secondary root bridges for the same MSTI on two or more switches using
the stp root secondary
command.
z You can also configure the current switch as the root bridge by setting the priority of
the switch to 0. Note that once a switch is configured as the root bridge or a
secondary root bridge, its priority cannot be modified.
III. Configuration example
# Configure the current switch as the root bridge of MSTI 1 and a secondary root bridge
of MSTI 2.
<H3C> system-view
[H3C] stp instance 1 root primary
[H3C] stp instance 2 root secondary
1.2.4 Bridge Priority Configuration
Root bridges are selected by the bridge priorities of switches. You can make a specific
switch be selected as a root bridge by setting a higher bridge priority for the switch
(Note that a smaller bridge priority value indicates a higher bridge priority.) An
MSTP-enabled switch can have different bridge priorities in different MSTIs.
I. Configuration procedure
Follow these steps to assign a bridge priority to a switch:
To do ... Use the command ... Remarks
Enter system view
system-view
—
Set a bridge priority
for the current
switch
stp [ instance instance-id ]
priority priority
Required
The default bridge priority of a
switch is 32,768.