H3C Technologies H3C S3600 Series Switches - Manual (Page 283)

1-30
Configuring How a Port Recognizes and Sends MSTP Packets
Refer to Configuring How a Port Recognizes and Sends MSTP Packets .
Configuring the Timeout Time Factor
Refer to Configuring the Timeout Time Factor .
Configuring the Maximum Transmitting Rate on the Current Port
Refer to Configuring the Maximum Transmitting Rate on the Current Port .
Configuring a Port as an Edge Port
Refer to Configuring the Current Port as an Edge Port .
Configuring the Path Cost for a Port
The path cost parameter reflects the rate of the link connected to the port. For a port on an
MSTP-enabled switch, the path cost may be different in different MSTIs. You can enable flows of
different VLANs to travel along different physical links by configuring appropriate path costs on ports, so
that VLAN-based load balancing can be implemented.
Path cost of a port can be determined by the switch or through manual configuration.
Standards for calculating path costs of ports
Currently, a switch can calculate the path costs of ports based on one of the following standards:
z dot1d-1998 : Adopts the IEEE 802.1D-1998 standard to calculate the default path costs of ports.
z dot1t : Adopts the IEEE 802.1t standard to calculate the default path costs of ports.
z legacy : Adopts the proprietary standard to calculate the default path costs of ports.
Follow these steps to specify the standard for calculating path costs:
To do... Use the command... Remarks
Enter system view system-view —
Specify the standard for
calculating the default path
costs of the links connected to
the ports of the switch
stp pathcost-standard
{ dot1d-1998 | dot1t | legacy }
Optional
By default, the legacy standard
is used to calculate the default
path costs of ports.
Table 1-7 Transmission rates vs. path costs
Rate
Operation mode
(half-/full-duplex)
802.1D-1998 IEEE 802.1t
Latency
standard
0 — 65,535 200,000,000 200,000
10 Mbps
Half-duplex/Full-duplex
Aggregated link 2 ports
Aggregated link 3 ports
Aggregated link 4 ports 100
95
95
95 2,000,000
1,000,000
666,666
500,000 2,000
1,800
1,600
1,400