H3C 7503-M，H3C 6800-2C

场地使用两台H3C 7503-M作为核心层，配置IRF；汇聚层使用H3C 6800-2C，配置IRF,

最近检查发现logbuffer 出现大量的"STP/6/STP_NOTIFIED_TC"的通知信息，如下：

核心层：H3C 7503-M IRF

######################################################################################################## %Apr 20 08:48:44:904 2023 CNHSW001 STP/6/STP_NOTIFIED_TC: Instance 0's port Bridge-Aggregation11 was notified a topology change. %Apr 20 08:48:46:299 2023 CNHSW001 STP/6/STP_NOTIFIED_TC: Instance 0's port Bridge-Aggregation12 was notified a topology change. %Apr 20 08:48:47:050 2023 CNHSW001 STP/6/STP_NOTIFIED_TC: Instance 0's port Bridge-Aggregation11 was notified a topology change. %Apr 20 08:56:55:591 2023 CNHSW001 STP/6/STP_NOTIFIED_TC: Instance 0's port Bridge-Aggregation11 was notified a topology change. %Apr 20 08:56:56:503 2023 CNHSW001 STP/6/STP_NOTIFIED_TC: Instance 0's port Bridge-Aggregation11 was notified a topology change. %Apr 20 08:56:56:845 2023 CNHSW001 STP/6/STP_NOTIFIED_TC: Instance 0's port Bridge-Aggregation12 was notified a topology change. %Apr 20 08:56:56:959 2023 CNHSW001 STP/6/STP_NOTIFIED_TC: Instance 0's port Bridge-Aggregation11 was notified a topology change. %Apr 20 08:56:57:486 2023 CNHSW001 STP/6/STP_NOTIFIED_TC: Instance 0's port Bridge-Aggregation12 was notified a topology change. %Apr 20 08:56:58:662 2023 CNHSW001 STP/6/STP_NOTIFIED_TC: Instance 0's port Bridge-Aggregation11 was notified a topology change. ########################################################################################################

汇聚层：H3C 6800-2C IRF

######################################################################################################## %Apr 19 08:58:07:859 2023 CNHSW101 STP/6/STP_NOTIFIED_TC: Instance 0's port Bridge-Aggregation1 was notified a topology change. %Apr 19 08:58:10:835 2023 CNHSW101 STP/6/STP_NOTIFIED_TC: Instance 0's port Bridge-Aggregation1 was notified a topology change. %Apr 19 09:11:23:657 2023 CNHSW101 STP/6/STP_NOTIFIED_TC: Instance 0's port Bridge-Aggregation1 was notified a topology change. %Apr 19 09:11:25:833 2023 CNHSW101 STP/6/STP_NOTIFIED_TC: Instance 0's port Bridge-Aggregation1 was notified a topology change. %Apr 19 09:11:26:973 2023 CNHSW101 STP/6/STP_NOTIFIED_TC: Instance 0's port Bridge-Aggregation1 was notified a topology change. %Apr 19 09:11:29:833 2023 CNHSW101 STP/6/STP_NOTIFIED_TC: Instance 0's port Bridge-Aggregation1 was notified a topology change. ##################################################################

但是检查发现两者出现的拓扑变更通知信息不是相同的。

问题：

（1）生产中配置的IRF技术，为什么日志会出现大量的"STP/6/STP_NOTIFIED_TC"日志？

（2）运行配置文件有

"# stp instance 0 root primary stp bpdu-protection stp global enable #", 但是IRF 不是已经认为是无环路的机制吗？

（3）如何进一步诊断以上出现的STP通知有关的端口和预防拓扑变更出现的问题？