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FAQ-What STP Path Cost Standards Are Adopted in the NE40s of Different Versions

Publication Date:  2012-07-27 Views:  124 Downloads:  0

Issue Description

What STP path cost standards are adopted for the NE40s of different versions? What is the difference between V300 and V500 in the standards? What should be noted after version upgrade if STP runs on the network? 

Alarm Information


Handling Process

1. In V300, the default STP port path cost standard is legacy, which is the proprietary algorithm of Huawei. In V500, the STP port path cost standard is IEEE 802.1t.
2. In V500, run the stp pathcost-standard { dot1d-1998 | dot1t | legacy } command to configure the path cost algorithm.
3. The same algorithm is applicable to port path costs of all switches on the same network. Therefore, after version upgrade, check whether the default STP path cost algorithm changes. In practice, forwarding faults used to occur as a result of the abnormal interface status caused by the STP path cost standard that was different from the standard adopted before version upgrade. 

Root Cause



For the default interface values under different STP cost algorithms adopted in the NE40s of different versions, see the appendix.