Operation Manual – MSTPH3C S7500 Series Ethernet Switches Chapter 1 MSTP Configuration1-29To do ... Use the command ... RemarksEnter system view system-view —Enter Ethernet portviewinterface interface-typeinterface-number —Configure portpriority for the portstp [ instance instance-id ]port priority priorityRequired.The default port priority is 128.Changing port priority of a port may change the role of the port and put the port intostate transition.A smaller port priority value indicates a higher possibility for the port to become the rootport. If all the ports of a switch have the same port priority value, the port priorities aredetermined by the port indexes. Changing the priority of a port will cause spanning treeregeneration.You can configure port priorities according to actual networking requirements.III. Configuration example# Configure the port priority of Ethernet2/0/1 in MSTI 1 to be 16.1) Configure in system view. system-view[H3C] stp interface ethernet2/0/1 instance 1 port priority 162) Configure in Ethernet port view. system-view[H3C] interface ethernet2/0/1[H3C-Ethernet2/0/1] stp instance 1 port priority 161.3.9 Point-to-point Link-Related ConfigurationRefer to section 1.2.12 “Point-to-point Link-Related Configuration”.1.3.10 MSTP ConfigurationRefer to section 1.2.13 “MSTP Configuration”.1.4 The mCheck ConfigurationAs mentioned previously, ports on an MSTP-enabled switch can operate in threemodes: STP-compatible, RSTP-compatible, and MSTP.A port on an MSTP-enabled switch operating as an upstream switch transits to theSTP-compatible mode when it has an STP-enabled switch connected to it. When theSTP enabled downstream switch is then replaced by an MSTP-enabled switch, the portcannot automatically transit to the MSTP mode. It remains in the STP-compatible mode.
