端口自动关闭，如何排查原因？

核心：S10508，1/0/025口光模块，下联新交换机S5130，1/0/52口光模块，

光跳线接好后，指示灯闪烁，但不一会儿就灭了，不知道为什么，如何排查？

还有，核心不是总根，不知道手动指定它为总根，是否会影响现有网络使用？如何排查？

核心S10508：

%Dec 3 11:38:49:475 2021 Core IFNET/3/LINK_UPDOWN: Ten-GigabitEthernet1/0/0/25 link status is DOWN. 

%Dec 3 11:40:27:747 2021 Core LLDP/5/LLDP_NEIGHBOR_AGE_OUT: -Chassis=1-Slot=0; Neighbor aged out on Port Ten-GigabitEthernet1/0/0/25 (IfIndex 3932184), Chassis ID is 307b-acc9-2a54, Port ID is Ten-GigabitEthernet1/0/52.

[Core-Ten-GigabitEthernet1/0/0/25]dis this # interface Ten-GigabitEthernet1/0/0/25

 port link-mode bridge # return

-------[CIST Global Info][Mode MSTP]------- 

CIST Bridge :32768.ac74-09ba-5fe2

 Bridge Times :Hello 2s MaxAge 20s FwDly 15s MaxHop 20

 CIST Root/ERPC :32768.1cab-3410-07c8 / 2

 CIST RegRoot/IRPC :32768.ac74-09ba-5fe2 / 0

 CIST RootPortId :128.4

 BPDU-Protection :disabled

 Bridge Config- Digest-Snooping :disabled

 TC or TCN received :1867833

 Time since last TC :0 days 0h:1m:26s 

 ----[Port25(Ten-GigabitEthernet1/0/0/25)][DOWN]---- 

 Port Protocol :enabled

 #Dec 3 11:22:07:194 2021 Core SHELL/4/LOGOUT:

 Trap 1.3.6.1.4.1.2011.10.2.2.1.1.3.0.2<h3cLogOut>:admin logout from Web

 Port Role :CIST Disabled Port

 Port Priority :128

 Port Cost(Legacy) :COnfig=auto / Active=200000

 Desg. Bridge/Port :32768.ac74-09ba-5fe2 / 128.25

 Port Edged :COnfig=disabled / Active=disabled

 Point-to-point :COnfig=auto / Active=false

 Transmit Limit :10 packets/hello-time

 Protection Type :None

 MST BPDU Format :COnfig=auto / Active=802.1s

 Port Config- Digest-Snooping :disabled

 Rapid transition :true

 Num of Vlans Mapped :1

 PortTimes :Hello 2s MaxAge 20s FwDly 15s MsgAge 0s RemHop 20

 BPDU Sent :161

 TCN: 0, Config: 0, RST: 0, MST: 161

 BPDU Received :4

 TCN: 0, Config: 0, RST: 0, MST: 4 

核心：S10508，1/0/025口光模块，下联新交换机S5130，1/0/52口光模块， 该交换机只有1/0/48接了测试笔记本，其余端口未接任何设备