接口down无crc错包
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问题描述：
接口不知道什么原因down后恢复，无crc错包
GigabitEthernet2/0/3
Current state: UP
Line protocol state: UP
IP packet frame type: Ethernet II, hardware address: 4073-4dca-70eb
Description: Managment_FW-b
Bandwidth: 1000000 kbps
Loopback is not set
Media type is twisted pair
Port hardware type is 1000_BASE_T
1000Mbps-speed mode, full-duplex mode
Link speed type is autonegotiation, link duplex type is autonegotiation
Flow-control is not enabled
Maximum frame length: 12288
Allow jumbo frames to pass
Broadcast max-ratio: 100%
Multicast max-ratio: 100%
Unicast max-ratio: 100%
Known-unicast max-ratio: 100%
PVID: 3751
MDI type: Automdix
Port link-type: Access
Tagged VLANs: None
Untagged VLANs: 3751
Port priority: 0
Last link flapping: 2 hours 24 minutes 58 seconds
Last clearing of counters: Never
Current system time:2025-10-28 12:45:28 Beijing+08:00:00
Last time when physical state changed to up:2025-10-28 10:20:31 Beijing+08:00:00
Last time when physical state changed to down:2025-10-28 10:17:34 Beijing+08:00:00
Peak input rate: 1253101 bytes/sec, at 2025-09-30 09:36:23
Peak output rate: 655176 bytes/sec, at 2025-03-21 02:44:26
Last 300 seconds input: 110 packets/sec 132673 bytes/sec 0%
Last 300 seconds output: 2 packets/sec 273 bytes/sec 0%
Input (total): 1394420131 packets, 1659826177728 bytes
1393511035 unicasts, 162 broadcasts, 908934 multicasts, 0 pauses
Input (normal): 1394420131 packets, - bytes
1393511035 unicasts, 162 broadcasts, 908934 multicasts, 0 pauses
Input: 0 input errors, 0 runts, 0 giants, 0 throttles
0 CRC, 0 frame, - overruns, 0 aborts
- ignored, - parity errors
Output (total): 62502167 packets, 13473925599 bytes
16427388 unicasts, 58379 broadcasts, 46016400 multicasts, 0 pauses
Output (normal): 62502167 packets, - bytes
16427388 unicasts, 58379 broadcasts, 46016400 multicasts, 0 pauses
Output: 0 output errors, - underruns, - buffer failures
0 aborts, 0 deferred, 0 collisions, 0 late collisions
0 lost carrier, - no carrier
IPv4 traffic statistics:
Last 300 seconds input rate: 0 packets/sec, 0 bytes/sec
Last 300 seconds output rate: 0 packets/sec, 0 bytes/sec
Input: 0 packets, 0 bytes
Output: 0 packets, 0 bytes
IPv6 traffic statistics:
Last 300 seconds input rate: 0 packets/sec, 0 bytes/sec
Last 300 seconds output rate: 0 packets/sec, 0 bytes/sec
Input: 0 packets, 0 bytes
Output: 0 packets, 0 bytes
%Sep 19 13:07:50:494 2025 d-ef-hl-managment-access-irf-204-a2-7-50u-250-33 SSHS/6/SSHS_CONNECT: SSH user admin (IP: 10.11.247.2) connected to the server successfully.
%Sep 19 13:07:50:890 2025 d-ef-hl-managment-access-irf-204-a2-7-50u-250-33 SHELL/5/SHELL_LOGIN: admin logged in from 10.11.247.2.
%Sep 19 13:07:52:628 2025 d-ef-hl-managment-access-irf-204-a2-7-50u-250-33 SHELL/4/SHELL_CMD_MATCHFAIL: -User=admin-IPAddr=10.11.247.2; Command ▒ in view shell failed to be matched.
%Sep 19 13:08:06:628 2025 d-ef-hl-managment-access-irf-204-a2-7-50u-250-33 SHELL/6/SHELL_CMD: -Line=vty0-IPAddr=10.11.247.2-User=admin; Command is dis int brief
%Sep 19 13:13:14:553 2025 d-ef-hl-managment-access-irf-204-a2-7-50u-250-33 SHELL/5/SHELL_LOGOUT: admin logged out from 10.11.247.2.
%Sep 19 13:13:14:553 2025 d-ef-hl-managment-access-irf-204-a2-7-50u-250-33 SSHS/6/SSHS_LOG: User admin logged out from 10.11.247.2 port 37552.
%Sep 19 13:13:14:554 2025 d-ef-hl-managment-access-irf-204-a2-7-50u-250-33 SSHS/6/SSHS_DISCONNECT: SSH user admin (IP: 10.11.247.2) disconnected from the server.
%Sep 26 07:19:10:903 2025 d-ef-hl-managment-access-irf-204-a2-7-50u-250-33 IFNET/3/PHY_UPDOWN: Physical state on the interface GigabitEthernet2/0/3 changed to down.
%Sep 26 07:19:11:313 2025 d-ef-hl-managment-access-irf-204-a2-7-50u-250-33 LLDP/6/LLDP_DELETE_NEIGHBOR: -Slot=2; Nearest bridge agent neighbor deleted on port GigabitEthernet2/0/3 (IfIndex 66), neighbor's chassis ID is 1211-8577-e6a0, port ID is ge2.
%Sep 26 07:19:10:924 2025 d-ef-hl-managment-access-irf-204-a2-7-50u-250-33 IFNET/5/LINK_UPDOWN: Line protocol state on the interface GigabitEthernet2/0/3 changed to down.
%Sep 26 07:22:23:409 2025 d-ef-hl-managment-access-irf-204-a2-7-50u-250-33 STP/6/STP_FORWARDING: -Slot=2; Instance 0's port GigabitEthernet2/0/3 has been set to forwarding state.
%Sep 26 07:22:23:022 2025 d-ef-hl-managment-access-irf-204-a2-7-50u-250-33 IFNET/3/PHY_UPDOWN: Physical state on the interface GigabitEthernet2/0/3 changed to up.
%Sep 26 07:22:23:023 2025 d-ef-hl-managment-access-irf-204-a2-7-50u-250-33 IFNET/5/LINK_UPDOWN: Line protocol state on the interface GigabitEthernet2/0/3 changed to up.
%Sep 26 07:23:34:536 2025 d-ef-hl-managment-access-irf-204-a2-7-50u-250-33 LLDP/6/LLDP_CREATE_NEIGHBOR: -Slot=2; Nearest bridge agent neighbor created on port GigabitEthernet2/0/3 (IfIndex 66), neighbor's chassis ID is 1211-8577-e6a0, port ID is ge2.
%Sep 28 17:16:10:744 2025 d-ef-hl-managment-access-irf-204-a2-7-50u-250-33 SSHS/6/SSHS_AUTH_SUCCESS: SSH user admin from 10.11.247.2 port 19292 passed password authentication.
%Sep 28 17:16:12:273 2025 d-ef-hl-managment-access-irf-204-a2-7-50u-250-33 SSHS/6/SSHS_CONNECT: SSH user admin (IP: 10.11.247.2) connected to the server successfully.
%Sep 28 17:16:12:655 2025 d-ef-hl-managment-access-irf-204-a2-7-50u-250-33 SHELL/5/SHELL_LOGIN: admin logged in from 10.11.247.2.
%Sep 28 17:16:23:673 2025 d-ef-hl-managment-access-irf-204-a2-7-50u-250-33 SHELL/6/SHELL_CMD: -Line=vty0-IPAddr=10.11.247.2-User=admin; Command is dis int brief
一、故障原因分析
- 对端设备接口波动日志中 “LLDP 邻居删除 / 创建”（如 % Sep 26 的 LLDP 日志）说明对端设备（如防火墙、交换机）的接口也出现了短暂 down/up，可能是对端设备接口的物理连接松动、电源波动或自身软件临时异常导致。
- 链路协商短暂不匹配接口工作在 “自动协商” 模式（
link speed/duplex type is autonegotiation），若对端设备在协商过程中短暂出现速率 / 双工不匹配（如一端强制 100M 全双工，另一端自动协商），会触发接口 down 后自动恢复。 - STP 临时收敛（次要因素）% Sep 26 的
STP_FORWARDING日志说明接口属于 STP 域，STP 收敛过程中可能短暂 block 接口，但通常不会导致物理 down，此处更偏向是链路波动后的 STP 状态恢复。
二、排查与预防措施
1. 排查对端设备接口
- 登录对端设备（如连接的防火墙），查看对应接口的 down/up 日志（如
display logbuffer），确认是否存在同步的接口波动，排查其物理连接（网线、模块）和电源状态。
2. 固化接口协商模式
# 本端接口配置（以华三设备为例）
interface GigabitEthernet2/0/3
speed 1000 # 强制1000M
duplex full # 强制全双工
undo negotiation auto # 关闭自动协商3. 监控接口波动频率
# 开启接口状态变化告警
snmp-agent trap enable feature-name ifnet trap-name if-mib-change
# 查看接口历史波动次数
display interface GigabitEthernet2/0/3 | include "Last link flapping"4. 检查电源稳定性
display power），对端设备同理。总结
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