Designated Path Cost; Table 7-9 Recommended Values Of The Port Path Cost - Huawei OptiX OSN 550 Configuration Manual

OptiX OSN 550 Multi-Service CPE Optical Transmission
System
Configuration Guide
Relationship with Other Parameters
You can change the parameter value by setting the port priority. In this case, however, the
topology of the spanning tree may be rearranged.
If the port priority is smaller, the port ID is smaller. When the port priorities are the same, the
port ID is smaller if the port number is smaller.

7.78 Designated Path Cost

Description
The Designated Path Cost parameter is applicable to the port and is used for the state machine
calculation of the spanning tree. Based on the port path cost, you can calculate the root path cost
of the port of the switch. The root path cost is equal to 0 in the case of a root bridge. In the case
of other bridges, the root path cost of the bridge refers to the path cost from the root bridge to
this bridge. The root path cost is the sum of the minimum root path cost of the port on this bridge
and the path cost of this port. The path cost of each port can be set through the management
module.
related to the MAC type and transmission rate.

Table 7-9 Recommended values of the port path cost

Parameter
Path Cost
Impact on the System
This parameter affects the calculation of the root path cost based on the STP and hence affects
the service flow in the spanning tree.
Issue 02 (2011-06-30)
Table 7-9 shows the recommended values of the port path cost. The values are generally
Link Speed
<=100 Kb/s
1 Mb/s
10 Mb/s
100 Mb/s
1 Gb/s
10 Gb/s
100 Gb/s
1 Tb/s
10 Tb/s
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