Configuring A Port To Connect To Point-To-Point Link; Enabling Mstp; Mcheck Configuration; Prerequisites - 3Com 5500-SI Configuration Manual

184 C 13: MSTP C
HAPTER
Configuring a Port to
Connect to
Point-to-Point Link

Enabling MSTP

mCheck Configuration

Prerequisites

ONFIGURATION
Configuring the priority of a port in Ethernet port view
Table 165 Configure the priority of a port in Ethernet port view
Operation
Enter system view
Enter Ethernet port view
Configure the port priority of
the port
Changes of port priorities can cause MSTP to redetermine the roles of ports, resulting
in state transition of ports.
A lower port priority value indicates a higher port priority. If all ports of a switch have
the same port priority setting, the actual port priorities are determined by the port
indexes.
You can configure port priorities based on the specific networking requirements.
Configuration example
Configure the priority of port Ethernet1/0/1 in spanning tree instance 1 to be 16.
1 Configure in system view.
<S5500> system-view
System View: return to User View with Ctrl+Z.
[S5500] stp interface ethernet1/0/1 instance 1 port priority 16
2 Configure in Ethernet port view.
<S5500> system-view
System View: return to User View with Ctrl+Z.
[S5500] interface ethernet1/0/1
[S5500-Ethernet1/0/1] stp instance 1 port priority 16
Refer to "Configuring a Port to Connect to Point-to-Point Link".
Refer to "Enabling MSTP".
As mentioned previously, ports on an MSTP-enabled switch can operate in three
modes: STP mode, RSTP mode, and MSTP mode. On a switched network, if a port on
a switch running MSTP is connected to a switch running STP or RSTP, it automatically
transits to STP or RSTP mode. But when the switch running STP or RSTP is
disconnected, the port cannot transit back to MSTP mode automatically; it remains in
STP or RSTP mode.
In this case, you can force the port to operate in MSTP mode by performing the
mCheck operation.
Configure MSTP on the switch properly.
Command
system-view
interface interface-type
interface-number
stp [ instance instance-id ]
port priority priority
Description
-
-
Required.
By default, all Ethernet ports of a
switch have the same priority,
namely 128.