Configure The Priority Of A Port - Huawei Quidway S6500 Series Operation Manual

Operation Manual - STP
Quidway S6500 Series Ethernet Switches
Link speed
100Mb/s
1000Mb/s
10G/s
Generally the path cost of the links in full duplex status is lower than those in half duplex
status.
In calculating the path cost of aggregation links, the 802.1D-1998 does not take into
account the number of aggregation links, but the 802.1T does. The formula involved is:
Path Cost = 200,000,000/link speed in 100Kbps
Where the link speed is the sum of the speed of the ports in unblocked status within the
aggregation links.

1.2.12 Configure the Priority of a Port

For spanning tree calculation, the port priority is an importance factor to determine if a
port can be elected as the root port. With other things being equal, the port with the
highest priority will be elected as the root port. On the MSTP switch, a port can have
different priorities in different STIs and plays different roles respectively. Thus the traffic
from different VLANs can run over different physical links, thereby implementing the
VLAN-based load-balancing.
You can configure the port priority in the following ways.
dot1d-1998
Duplex state
value range
Half-Duplex
Full-Duplex
19
Aggregated Link
18
2 Ports
15
Aggregated Link
15
3 Ports
15
Aggregated Link
4 Ports
Full-Duplex
Aggregated Link
4
2 Ports
3
Aggregated Link
3
3 Ports
3
Aggregated Link
4 Ports
Full-Duplex
Aggregated Link
2
2 Ports
1
Aggregated Link
1
3 Ports
1
Aggregated Link
4 Ports
Huawei Technologies Proprietary
1-22
Chapter 1 MSTP Region-configuration
dot1t value Huawei-3Co
range m cost value
200,000 200
199,999 200
100,000 180
66,666 160
50,000 140
20,000 20
10,000 18
6,666 16
5,000 14
2,000 2
1,000 1
666 1
500 1