114
Default level
2: System level
Parameters
instance
instance-id
: Sets the path cost of the port(s) in a particular MSTI. The
instance-id
argument
ranges from 0 to 16, where 0 represents the CIST.
cost
: Specifies the path cost of the port, with an effective range depends on the path cost calculation
standard adopted.
•
With the IEEE 802.1d-1998 standard selected for path cost calculation, the
cost
argument ranges
from 1 to 65535.
•
With the IEEE 802.1t standard selected for path cost calculation, the
cost
argument ranges from 1
to 200000000.
•
With the private standard selected for path cost calculation, the
cost
argument ranges from 1 to
200000.
Description
Use the
stp cost
command to set the path cost of the port(s) in the specified MSTI or all MSTIs.
Use the
undo stp cost
command to restore the system default.
By default, the switch automatically calculates the path costs of ports in each MSTI based on the
corresponding standard.
Configured in Layer 2 Ethernet interface view, the setting takes effect on the current interface only.
Configured in port group view, the setting takes effect on all ports in the port group.
Configured in Layer 2 aggregate interface view, the setting takes effect only on the aggregate interface.
Configured on a member port in an aggregation group, the setting takes effect only after the port leaves
the aggregation group.
Path cost is an important factor in spanning tree calculation. Setting different path costs for a port in
MSTIs allows VLAN traffic flows to be forwarded along different physical links, achieving VLAN-based
load balancing.
The path cost setting of a port can affect the role selection of the port. When the path cost of a port is
changed, MSTP will re-compute the role of the port and initiate a state transition.
Related commands:
display stp
and
stp pathcost-standard
.
Examples
# Set the path cost of port GigabitEthernet 1/0/3 in MSTI 2 to 200.
<Sysname> system-view
[Sysname] interface gigabitethernet 1/0/3
[Sysname-GigabitEthernet1/0/3] stp instance 2 cost 200
stp edged-port
Syntax
stp edged-port
{
enable
|
disable
}
undo stp
edged-port
