Huawei Quidway S5600 Series Operation Manual page 264

Operation Manual – MSTP
Quidway S5600 Series Ethernet Switches-Release 1510
Transm
ission
speed
10
Gbps
Normally, the path cost of a port operating in full-duplex mode is slightly less than that of
the port operating in half-duplex mode.
When calculating the path cost of an aggregated link, the 802.1D-1998 standard does
not take the number of the ports on the aggregated link into account, whereas the
802.1T standard does. The following formula is used to calculate the path cost of an
aggregated link:
Where the link transmission speed is the sum of the speeds of the unblocked ports on
the aggregated link, which is measured in 100 Kbps.
II. Configuring the path costs of ports
Table 1-24 Configure the path cost for specified ports in system view
Operation
Enter system view
Configure the path
cost for specified
ports
Table 1-25 Configure the path cost for a port in Ethernet port view
Operation
Enter system view
Enter Ethernet port
view
Configure the path
cost for the port
Operation mode
(half-/full-duplex)
Full-duplex
Aggregated link 2 ports
Aggregated link 3 ports
Aggregated link 4 ports
Path cost = 200,000,/ link transmission speed,
Command
system-view
stp interface interface-list
[ instance instance-id ] cost
cost
Command
system-view
interface
interface-number
stp [ instance instance-id ]
cost cost
Huawei Technologies Proprietary
802.1D-1998 IEEE 802.1t
2 200,000
1 1,000
1 666
1 500
—
Required
A MSTP-enabled switch can
calculate path costs for all its
ports automatically.
—
interface-type
—
Required
A MSTP-enabled switch can
calculate path costs for all its
ports automatically.
1-28
Chapter 1 MSTP Configuration
Proprietary
standard
2
1
1
1
Description
Description