场景网关告警短时间内出现类似告警【交换机日志】时间: 2026-09-28 08:42:43设备IP: 10.83.0.63级别: notice日志: Instance 0s port Bridge-Aggregation100 was notified a topology change.说明是有新网络设备接入网络导致网络拓扑发生变化网络中有大量tc报文传播。排查方法随意找一台出现告警的交换机登录交换机的系统管理界面输入命令H3Cdisplay stp tc输出结果类似于-------------- STP slot 3 TC or TCN count ------------- MST ID Port Receive Send 0 Bridge-Aggregation100 932 8 0 GigabitEthernet3/0/7 0 0 0 GigabitEthernet3/0/8 0 0 0 GigabitEthernet3/0/9 0 0 0 GigabitEthernet3/0/10 0 0 0 GigabitEthernet3/0/11 0 0 0 GigabitEthernet3/0/12 0 0 0 GigabitEthernet3/0/13 0 0 0 GigabitEthernet3/0/14 0 0 0 GigabitEthernet3/0/17 0 0 0 GigabitEthernet3/0/18 0 0 0 GigabitEthernet3/0/19 0 0 0 GigabitEthernet3/0/20 0 0 0 GigabitEthernet3/0/21 0 0 0 GigabitEthernet3/0/22 0 0 0 GigabitEthernet3/0/23 0 0 0 GigabitEthernet3/0/24 0 0 0 GigabitEthernet3/0/25 0 0 0 GigabitEthernet3/0/26 0 0 0 GigabitEthernet3/0/27 0 0 0 GigabitEthernet3/0/28 0 0 0 GigabitEthernet3/0/29 0 0 0 GigabitEthernet3/0/30 0 0 0 GigabitEthernet3/0/31 0 0 0 GigabitEthernet3/0/33 0 0 0 GigabitEthernet3/0/34 0 0 0 GigabitEthernet3/0/37 0 0 0 GigabitEthernet3/0/39 0 0 0 GigabitEthernet3/0/40 0 0 0 GigabitEthernet3/0/46 0 0 0 GigabitEthernet3/0/47 0 0 0 GigabitEthernet3/0/48 2 142不难发现聚合口100出现了大量接收到的tc报文说明拓扑发现是从该口涌入本交换机由于3/0/48端口下也有交换机接入所以3/0/48作为指定端口也承担着向下游转发tc的任务故而有大量的tc向下游设备转发。注意只有根端口才会向上游转发tc指定端口只会向下转发tc。所以下一步就是顺着聚合口100向上寻找设备。命令为SYC-HZ-4F-SERVER-OASW-S5570S-0.63dis link-aggregation verbose Bridge-Aggregation 100 Loadsharing Type: Shar -- Loadsharing, NonS -- Non-Loadsharing Port Status: S -- Selected, U -- Unselected, I -- Individual Port: A -- Auto port, M -- Management port, R -- Reference port Flags: A -- LACP_Activity, B -- LACP_Timeout, C -- Aggregation, D -- Synchronization, E -- Collecting, F -- Distributing, G -- Defaulted, H -- Expired Aggregate Interface: Bridge-Aggregation100 Creation Mode: Manual Aggregation Mode: Dynamic Loadsharing Type: Shar Management VLANs: None System ID: 0x8000, 30f5-2756-a8a0 Local: Port Status Priority Index Oper-Key Flag XGE3/0/53(R) S 32768 1 1 {ABCDEF} XGE3/0/54 S 32768 2 1 {ABCDEF} Remote: Actor Priority Index Oper-Key SystemID Flag XGE3/0/53 32768 2 2 0x8000, 9074-2ef4-dc8a {ABCDEF} XGE3/0/54 32768 5 2 0x8000, 9074-2ef4-dc8a {ABCDEF} SYC-HZ-4F-SERVER-OASW-S5570S-0.63dis lldp neighbor-information interface xge3/0/53 v LLDP neighbor-information of port 179[Ten-GigabitEthernet3/0/53]: LLDP agent nearest-bridge: LLDP neighbor index : 1 Update time : 147 days, 5 hours, 44 minutes, 0 seconds Chassis type : MAC address Chassis ID : 9074-2ef4-dc8a Port ID type : Interface name Port ID : Ten-GigabitEthernet1/0/43 Time to live : 121 Port description : To-[SYC-HZ-4F-SERVER-OASW-S5570S-0.63]-Ten-GigabitEtherne t3/0/53 System name : SYC-HZ-4F-SERVER-DSW-S6520X-0.5 System description : H3C Comware Platform Software, Software Version 7.1.070, Release 6628P47 H3C S6520X-54QC-EI Copyright (c) 2004-2023 New H3C Technologies Co., Ltd. All rights reserved. System capabilities supported : Bridge, Router, Customer Bridge, Service Bridge System capabilities enabled : Bridge, Router, Customer Bridge Management address type : IPv4 Management address : 10.83.0.5 Management address interface type : IfIndex Management address interface ID : 792 Management address OID : 0 Port VLAN ID(PVID) : 1 Link aggregation supported : Yes Link aggregation enabled : Yes Aggregation port ID : 797 Auto-negotiation supported : Yes Auto-negotiation enabled : No OperMau : Speed(10000)/Duplex(Full) Power port class : PSE PSE power supported : No PSE power enabled : No PSE pairs control ability : No Power pairs : Signal Port power classification : Class 0 Power type : Type 2 PSE Power source : Primary Power priority : Unknown PD requested power value : 0.0 w PSE allocated power value : 0.0 w Maximum frame size : 10000从而找到聚合口100的对端设备0.5然后重复上述操作即能找到新接入的设备的上联交换机。注意在dis stp tc的输出结果中主要观察哪个接口下的接收的tc最多优先找该接口的对端。最后找到接入交换机SYC-HZ-8F-OA-ASW-5570S-0.19dis stp tc -------------- STP slot 1 TC or TCN count ------------- MST ID Port Receive Send 0 Bridge-Aggregation7 0 0 0 Bridge-Aggregation100 78 29 0 GigabitEthernet1/0/22 0 0 0 GigabitEthernet1/0/43 2 42 0 GigabitEthernet1/0/44 0 0 0 GigabitEthernet1/0/46 2 2 0 GigabitEthernet1/0/48 0 0从tc计数看该交换机的聚合口100收到大量tc说明从上游传过来了大量的tc。其中GE1/0/46端口的receive 2 / send 2 的计数非常符合“新接入一台交换机发生一次 TC 交互”的特征。所以基本可以确定该端口下新接入了一台网络设备。基础知识补充STP协议以及端口选举规则https://blog.csdn.net/weixin_60067160/article/details/125871101
