Configuring Mstp Operation Mode; Configuring The Timeout Time Factor; Configuring The Maximum Transmission Speed Of A Port; Setting A Port As An Edge Port - 3Com 5500-SI Configuration Manual

Configuring MSTP
Operation Mode
Configuring the Timeout
Time Factor
Configuring the
Maximum Transmission
Speed of a Port
Setting a Port as an Edge
Port
Configuring the Path
Cost of a Port
Refer to "Configuring MSTP Operation Mode".
Refer to "Configuring the Timeout Time Factor".
Refer to "Configuring the Maximum Transmission Speed of a Port".
Refer to "Setting a Port as an Edge Port".
The path cost of a port is related with the speed of the connected link. A port of an
MSTP-enabled switch can have different path costs for different spanning tree
instances. By configuring proper path costs, you can enable flows of different VLANs
to travel along different physical links to implement VLAN-based load balancing.
Path cost can be configured manually or be determined by the switch.
Specifying the standard for calculating path costs of ports
Currently, the following standards are available for calculating path costs of ports on a
switch:
dot1d-1998: Adopts the IEEE 802.1D-1998 standard to calculate the default path
■
costs of ports.
dot1t: Adopts the IEEE 802.1t standard to calculate the default path costs of
■
ports.
legacy: Adopts the standard defined by 3Com-3Com Technology Co., Ltd to
■
calculate the default path costs of ports.
Table 160 Specify the standard for calculating path costs
Operation
Enter system view
Specify the standard for
calculating the default path
costs of links connecting to
the switch
Table 161 Transmission speeds and the corresponding path costs
Transmission Operation mode
speed (half-/full-duplex)
0 —
10 Mbps Half-Duplex
Full-Duplex
Aggregated Link 2 Ports
Aggregated Link 3 Ports
Aggregated Link 4 Ports
Command
system-view
stp pathcost-standard {
dot1d-1998 | dot1t | legacy
}
802.1D-1998
65,535
100
99
95
95
95
Leaf Node Configuration 181
Description
-
Optional
By default, the IEEE 802.1t
standard is used to calculate the
default path costs of ports.
3Com-3Com
IEEE 802.1t standard
200,000,000 200,000
2,000,000 2,000
1,999,999 2,000
1,000,000 1,800
666,666 1,600
500,000 1,400