H3C Technologies H3C S3100 Series Switches - Manual (Page 207)

Operation Manual – MSTP
H3C S3100-52P Ethernet Switch
Chapter 1 MSTP Configuration
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Changing port priority of a port may change the role of the port and put the port into
state transition.
A smaller port priority value indicates a higher possibility for the port to become the root
port. If all the ports of a switch have the same port priority value, the port priorities are
determined by the port indexes. Changing the priority of a port will cause spanning tree
recalculation.
You can configure port priorities according to actual networking requirements.
III. Configuration example
# Configure the port priority of Ethernet1/0/1 in spanning tree instance 1 to be 16.
1) Perform this configuration in system view.
system-view
[H3C] stp interface ethernet1/0/1 instance 1 port priority 16
2) Perform this configuration in Ethernet port view.
system-view
[H3C] interface ethernet1/0/1
[H3C-Ethernet1/0/1] stp instance 1 port priority 16
1.3.9 Specifying Whether the Link Connected to a Port Is a Point-to-point
Link
Refer to section 1.2.13 “Specifying Whether the Link Connected to a Port Is
Point-to-point Link”.
1.3.10 Enabling the MSTP Feature
Refer to section 1.2.14 “Enabling the MSTP Feature”.
1.4 Performing mCheck
Ports on an MSTP-enabled switch can operate in three modes: STP-compatible,
RSTP-compatible, and MSTP.
A port on an MSTP-enabled switch operating as an upstream switch transits to the
STP-compatible mode when it has an STP-enabled switch connected to it. When the
STP-enabled downstream switch is then replaced by an MSTP-enabled switch, the
port cannot automatically transit to the MSTP mode. It remains in the STP-compatible
mode. In this case, you can force the port to transit to the MSTP mode by performing
the mCheck operation on the port.
Similarly, a port on an RSTP-enabled switch operating as an upstream switch turns to
the STP-compatible mode when it has an STP-enabled switch connected to it. When
the STP enabled downstream switch is then replaced by an MSTP-enabled switch, the
port cannot automatically transit to the MSTP-compatible mode. It remains in the