1、查看设备型号为S2700-9TP-PWR-EI,为内置PoE电源设备,确认设备支持PoE功能且电源状态正常。
2、进入连接PD的接口GigabitEthernet0/0/6下,查看是否有去使能PoE功能的配置,经确认,PoE功能已使能。
<HUAWEI> system-view
[HUAWEI] interface GigabitEthernet0/0/6
[HUAWEI-GigabitEthernet0/0/6] display this
port link-type access
port default vlan 100
Step2:检查PSE能否检测到PD。
1、检查是否网线故障。用一根确认正常的网线,使用原接口重新连接此AP,发现现象描述仍然存在,排除原网线故障的可能性。
2、检查PD设备是否良好接地。查看交换机接地点,已经使用黄绿色接地线有效接地。
3、检查是否PD不兼容。在交换机上查看告警信息,发现设备上报非标PD告警:POE/4/NONSTANDARDPD:An invalid or non-standard PD is connected to the interface [gigabitEthernet0/0/6].
2、同时设备上还出现CPU占用率过高的日志信息。
Switch %%01VOSCPU/4/CPU_USAGE_HIGH(l)[31]:The CPU is overloaded(CpuUsage=96%, Threshold=95%), and the tasks with top three CPU occupancy are:
FTS total : 18%
SRMT total : 11%
SOCK total : 8%
Switch %%01VOSCPU/4/CPU_USAGE_HIGH(l)[60]:The CPU is overloaded(CpuUsage=100%, Threshold=95%), and the tasks with top three CPU occupancy are:
PPI total : 41%
SRMT total : 10%
FTS total : 8%
3、同时设备上还有大量的ARP报文超过CPCAR后丢弃的日志记录。
Switch %%01DEFD/4/CPCAR_DROP_MPU(l)[56]:Rate of packets to cpu exceeded the CPCAR limit on the MPU. (Protocol=arp-miss, ExceededPacketCount=016956)
Switch %%01DEFD/4/CPCAR_DROP_MPU(l)[57]:Rate of packets to cpu exceeded the CPCAR limit on the MPU. (Protocol=arp-reply, ExceededPacketCount=020699)
Switch %%01DEFD/4/CPCAR_DROP_MPU(l)[58]:Rate of packets to cpu exceeded the CPCAR limit on the MPU. (Protocol=arp-request, ExceededPacketCount=0574
2、通过display stp tc命令也可以看到端口收到的TC报文情况:
[Switch-A-hidecmd] display stp tc
———- Stp Instance 0 tc or tcn count ———-
Port GigabitEthernet1/0/0 0
Port GigabitEthernet1/0/1 0
Port GigabitEthernet1/0/2 0
Port GigabitEthernet1/0/3 0
Port GigabitEthernet1/0/4 87
Port GigabitEthernet1/0/5 123
Port GigabitEthernet1/0/6 99
Port GigabitEthernet1/0/8 71
Port GigabitEthernet1/0/9 173
Port GigabitEthernet1/0/10 146
Port GigabitEthernet1/0/13 8
Port GigabitEthernet1/0/21 0
3、分析日志,日志中也显示收到TC报文、进行ARP表项老化处理的记录:
Apr 19 2011 09:59:58 DCN_S9306_A %%01MSTP/6/RECEIVE_MSTITC(l): MSTP received BPDU with TC, MSTP process 0 instance 0, port name is Ethernet4/0/46.
同时有arp-reply报文的cpcar丢弃记录:
Apr 19 2011 09:28:13 DCN_S9306_A %%01QOSE/4/CPCAR_DROP_LPU(l): Some packets are dropped by cpcar on the LPU in slot 1. (Protocol=arp-reply, Drop-Count=061)