Configuring Port Priority - H3C S3100 8C SI Operation Manual

Operation Manual – MSTP
H3C S3100 Series Ethernet Switches
III. Configuration example (A)
# Configure the path cost of Ethernet 1/0/1 in spanning tree instance 1 to be 2,000.
1) Perform this configuration in system view
<Sysname> system-view
[Sysname] stp interface Ethernet1/0/1 instance 1 cost 2000
2) Perform this configuration in Ethernet port view
<Sysname> system-view
[Sysname] interface Ethernet1/0/1
[Sysname-Ethernet1/0/1] stp instance 1 cost 2000
IV. Configuration example (B)
# Configure the path cost of Ethernet 1/0/1 in spanning tree instance 1 to be calculated
by the MSTP-enabled switch according to the IEEE 802.1D-1998 standard.
1) Perform this configuration in system view
<Sysname> system-view
[Sysname] undo stp interface Ethernet1/0/1 instance 1 cost
[Sysname] stp pathcost-standard dot1d-1998
2) Perform this configuration in Ethernet port view
<Sysname> system-view
[Sysname] interface Ethernet1/0/1
[Sysname-Ethernet1/0/1] undo stp instance 1 cost
[Sysname-Ethernet1/0/1] quit
[Sysname] stp pathcost-standard dot1d-1998

1.4.8 Configuring Port Priority

Port priority is an important criterion on determining the root port. In the same condition,
the port with the smallest port priority value becomes the root port.
A port on an MSTP-enabled switch can have different port priorities and play different
roles in different spanning tree instances. This enables packets of different VLANs to be
forwarded along different physical paths, so that VLAN-based load balancing can be
implemented.
You can configure port priority in one of the following two ways.
I. Configure port priority in system view
Table 1-32 Configure port priority in system view
Enter system view
Operation
system-view
Command
1-40
Chapter 1 MSTP Configuration
Description
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