3com 4210 PWR 9-Port 3CR17341-91-ME 用户手册
产品代码
3CR17341-91-ME
172
C
HAPTER
14: MSTP C
ONFIGURATION
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.
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.
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
<4210> system-view
[4210] stp interface Ethernet1/0/1 instance 1 port priority 16
2 Perform this configuration in Ethernet port view
<4210> system-view
[4210] interface Ethernet1/0/1
[4210-Ethernet1/0/1] stp instance 1 port priority 16
Specifying Whether the
Link Connected to a Port
Is a Point-to-point Link
Enabling MSTP
Refer to “Enabling MSTP” on page 166.
Performing mCheck
Operation
Operation
Ports on an MSTP-enabled switch can operate in three modes: STP-compatible,
RSTP-compatible, and MSTP.
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.
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 STP-compatible mode. In this case, you can force the port to transit
to the MSTP-compatible mode by performing the mCheck operation on the port.
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 STP-compatible mode. In this case, you can force the port to transit
to the MSTP-compatible mode by performing the mCheck operation on the port.
Configuration
Prerequisites
MSTP runs normally on the switch.
Configuration Procedure
You can perform the mCheck operation in the following two ways.