Configuring Port Priority - HP A5830 Configuration Manual

Configuring re-calculated port path cost
When the path cost of a port changes, the system re-calculates the role of the port and initiates a state
transition.
To configure the re-calculated path cost of ports:
Step...
1. Enter system view
2. Enter
interface
view or
port
group
view
3. Configure the path cost of the ports
(in STP/RSTP mode)
4. Configure the path cost of the ports
(in PVST mode)
5. Configure the path cost of the ports
(in MSTP mode)
Configuration examples
# In MSTP mode, specify the device to calculate the default path costs of its ports by using IEEE 802.1d-
1998, and set the path cost of GigabitEthernet 1/0/3 to 200 on MSTI 2.
<Sysname> system-view
[Sysname] stp pathcost-standard dot1d-1998
[Sysname] interface gigabitethernet 1/0/3
[Sysname-GigabitEthernet1/0/3] stp instance 2 cost 200
# In PVST mode, specify the device to calculate the default path costs of its ports by using IEEE 802.1d-
1998, and set the path cost of GigabitEthernet 1/0/3 to 2000 on VLANs 20 through 30.
<Sysname> system-view
[Sysname] stp mode pvst
[Sysname] stp pathcost-standard dot1d-1998
[Sysname] interface gigabitethernet 1/0/3
[Sysname-GigabitEthernet1/0/3] stp vlan 20 to 30 cost 2000

Configuring port priority

The priority of a port is an important factor in determining whether the port can be elected as the root
port of a device. If all other conditions are the same, the port with the highest priority is elected as the
root port.
On a spanning tree device, a port can have different priorities and play different roles in different
spanning trees, so that data of different VLANs can be propagated along different physical paths,
implementing per-VLAN load balancing.
requirements.
When the priority of a port changes, MSTP re-calculates the role of the port and initiates a state
transition.
Enter Layer 2 Ethernet
interface view or Layer
2 aggregate interface
view
Enter port group view
Command...
system-view
interface interface-type interface-
number
port-group manual port-group-
name
stp cost cost
stp vlan vlan-list cost cost
stp [ instance instance-id ] cost
cost
Set port priority values based on the actual networking
72
Remarks
—
Required
Use either command
Required
Use any command
By default, the system
automatically calculates the
path cost of each port