Txholdcount(Per Second) (Spanning Tree); Root Path Cost - Huawei OptiX OSN 550 Configuration Manual

OptiX OSN 550 Multi-Service CPE Optical Transmission
System
Configuration Guide

7.74 TxHoldCount(per second) (Spanning Tree)

Description
The TxHoldCount(per second) parameter enables the transmission state machine of the port
to specify the maximum transmission rate of the BPDU packet.
Impact on the System
This parameter ensures that the number of the BPDU packets transmitted within a period of hello
time does not exceed the preset value.
Values
Value Range
1-10 times/s
Configuration Guidelines
Set this parameter according to the actual requirement of the user. It is recommended that you
use the default value.

7.75 Root Path Cost

Description
Each bridge has the root path cost. The root path cost of the root bridge is equal to 0. In the case
of non-root bridges, the root path cost of each bridge is equal to the sum of path cost values of
each port on the other bridges that a non-root bridge passes when the bridge receives the frame
from the root bridge along the minimum cost path. The path cost of each port can be managed.
The network segment in each LAN has the root path cost. The root path cost of the network
segment is equal to the root path cost of the bridge whose cost is the smallest among all the
bridges that are connected to the network segment through the bridge ports. In this case, the
bridge whose cost is the smallest is selected as the designated bridge. If the root path cost values
of two or more bridges are the same and the smallest, the bridge with a higher priority is selected
as the root bridge.
In the case of non-root bridges, the root path cost of each bridge is equal to the sum of path cost
values of each port on the other bridges that a non-root bridge passes when the bridge receives
the frame from the root bridge along the minimum cost path. That is, the value of the root path
cost is the sum of the path cost values of all bridges.
Impact on the System
The root path cost can determine the designated bridge and the service flow in the STP.
Issue 02 (2011-06-30) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Default Value
6
7 List of Parameters
7-63