Huawei Quidway S5600 Series - Page 264

Operation Manual – MSTP
Quidway S5600 Series Ethernet Switches-Release 1510 Chapter 1
MSTP Configuration
Huawei Technologies Proprietary
1-28
Transm
ission
speed
Operation mode
(half-/full-duplex)
802.1D-1998 IEEE 802.1t
Proprietary
standard
10
Gbps
Full-duplex
Aggregated link 2 ports
Aggregated link 3 ports
Aggregated link 4 ports
2
1
1
1
200,000
1,000
666
500
2
1
1
1
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:
Path cost = 200,000,/ link transmission speed,
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 Command Description
Enter system view
system-view
—
Configure the path
cost for specified
ports
stp interface interface-list
[ instance instance-id ] cost
cost
Required
A MSTP-enabled switch can
calculate path costs for all its
ports automatically.
Table 1-25 Configure the path cost for a port in Ethernet port view
Operation Command Description
Enter system view
system-view
—
Enter Ethernet port
view
interface interface-type
interface-number
—
Configure the path
cost for the port
stp [ instance instance-id ]
cost cost
Required
A MSTP-enabled switch can
calculate path costs for all its
ports automatically.