ping丢包

Oct 11 2020 02:42:53 109 %%01IFPDT/4/IF_STATE(l)[0]:Interface GigabitEthernet0/0/4 has turned into UP state. Oct 11 2020 02:42:48 109 %%01IFADP/4/PORTDOWNINFO(l)[1]:Interface GigabitEthernet0/0/4 has turned into DOWN state. (Information=Physical state: down, Negotiation: enable, Negotiation complete: no, Local full-duplex(10M: yes, 100M: yes, 1000M: yes), Local half-duplex(10M: yes, 100M: yes, 1000M: no), Remote full-duplex(10M: no, 100M: no, 1000M: no), Remote half-duplex(10M: no, 100M: no, 1000M: no)) Oct 11 2020 02:42:48 109 %%01IFPDT/4/IF_STATE(l)[2]:Interface GigabitEthernet0/0/4 has turned into DOWN state. Oct 10 2020 22:38:33 109 %%01IFPDT/4/IF_STATE(l)[3]:Interface GigabitEthernet0/0/5 has turned into UP state. Oct 10 2020 22:30:32 109 %%01IFPDT/4/IF_STATE(l)[4]:Interface GigabitEthernet0/0/3 has turned into UP state. Oct 10 2020 22:29:35 109 %%01IFADP/4/PORTDOWNINFO(l)[5]:Interface GigabitEthernet0/0/3 has turned into DOWN state. (Information=Physical state: down, Negotiation: enable, Negotiation complete: no, Local full-duplex(10M: yes, 100M: yes, 1000M: yes), Local half-duplex(10M: yes, 100M: yes, 1000M: no), Remote full-duplex(10M: no, 100M: no, 1000M: no), Remote half-duplex(10M: no, 100M: no, 1000M: no)) Oct 10 2020 22:29:35 109 %%01IFPDT/4/IF_STATE(l)[6]:Interface GigabitEthernet0/0/3 has turned into DOWN state. Oct 10 2020 22:27:30 109 %%01IFPDT/4/IF_STATE(l)[7]:Interface GigabitEthernet0/0/3 has turned into UP state. Oct 10 2020 21:55:57 109 %%01IFADP/4/PORTDOWNINFO(l)[8]:Interface GigabitEthernet0/0/3 has turned into DOWN state. (Information=Physical state: down, Negotiation: enable, Negotiation complete: no, Local full-duplex(10M: yes, 100M: yes, 1000M: yes), Local half-duplex(10M: yes, 100M: yes, 1000M: no), Remote full-duplex(10M: no, 100M: no, 1000M: no), Remote half-duplex(10M: no, 100M: no, 1000M: no)) Oct 10 2020 21:55:57 109 %%01IFPDT/4/IF_STATE(l)[9]:Interface GigabitEthernet0/0/3 has turned into DOWN state. Oct 10 2020 21:51:00 109 %%01IFPDT/4/IF_STATE(l)[10]:Interface GigabitEthernet0

pc1——>swA——>swB——>swC——>pc2 ，swA与swC为接入层交换机分别接pc1和pc2，swB为核心交换机，pc1为192.168.1.2，pc2为192.168.2.2，swA、swC与核心swB分别用中继口对接，swB做动态路由,现在pc1去ping pc2，有丢包。日志告警在问题描述，求解为什么会有丢包？该怎样解决