R3721-F3210-F3171-HP High-End Firewalls Network Management Configuration Guide-6PW101

93
Link speed Port type
Path cost
IEEE
802.1d-1998
IEEE 802.1t Private standard
Aggregate interface
containing 4 Selected ports
50,000 140
1000 Mbps
Single Port
4
20,000 20
Aggregate interface
containing 2 Selected ports
10,000 18
Aggregate interface
containing 3 Selected ports
6666 16
Aggregate interface
containing 4 Selected ports
5000 14
Configuring path costs of ports
To configure the path cost of ports:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter Ethernet interface view or
Layer 2 aggregate interface
view.
interface interface-type
interface-number
N/A
3. Configure the path cost of the
ports.
• In STP/RSTP mode:
stp cost cost
• In MSTP mode:
stp [ instance instance-id ] cost
cost
Use either command.
By default, the system
automatically calculates the
path cost of each port.
NOTE:
W
hen the path cost of a port chan
g
es, the system re-calculates the role of the port and initiates a state
transition.
Configuration example
# 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 0/3 to 200 on MSTI 2.
<Sysname> system-view
[Sysname] stp pathcost-standard dot1d-1998
[Sysname] interface gigabitethernet 0/3
[Sysname-GigabitEthernet0/3] stp instance 2 cost 200
Configuring the 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 will be 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,