Stp Point-To-Point - H3C S3100 Series Command Manual

Link speed
Full-duplex
Aggregated link 2 ports
10 Gbps
Aggregated link 3 ports
Aggregated link 4 ports
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, "link transmission rate" is the sum of the rates of all the unblocked ports on the aggregated link
measured in 100 Kbps.
You can use the stp cost command to manually configure the path cost of a port in a specified MSTI.
For details, see stp
Examples
# Configure to use the IEEE 802.1D-1998 standard to calculate the default path costs of ports.
<Sysname> system-view
System View: return to User View with Ctrl+Z.
[Sysname] stp pathcost-standard dot1d-1998
# Configure to use the IEEE 802.1t standard to calculate the default path costs of ports.
<Sysname> system-view
System View: return to User View with Ctrl+Z.
[Sysname] stp pathcost-standard dot1t

stp point-to-point

Syntax
Ethernet port view:
stp point-to-point { force-true | force-false | auto }
undo stp point-to-point
System view:
stp interface interface-list point-to-point { force-true | force-false | auto }
undo stp interface interface-list point-to-point
View
System view, Ethernet port view
Parameters
force-true: Specifies that the link connected to the current Ethernet port is a point-to-point link.
Duplex state
Path cost = 200,000,000 / link transmission rate
cost.
Path cost in Path cost in
802.1d-1998 IEEE 802.1t
standard standard
2 2,000
1 1,000
1 666
1 500
1-30
Path cost in
private
standard
2
1
1
1