华为USG6555F 防火墙 ---华为6857交换机 光口对接无法UP故障

互联使用模块：千兆单模光模块

2端接口都无法UP

检查

[USG6555F] dis int g 0/0/6
2026-01-14 18:48:28.359 +08:00
GE0/0/6 current state : down (ifindex: 12)
Line protocol current state : DOWN 
Last line protocol up time : 2026-01-14 03:20:00+08:00
Description: 
Route Port,The Maximum Transmit Unit is 1500,The Maximum Frame Length is 9216
Internet Address is 10.18.200.252/26
IP Sending Frames' Format is PKTFMT_ETHNT_2, Hardware address is 2426-d6a4-1cd8
Port Mode:     COMMON COPPER,     Port Split/Aggregate:               -
Speed:                 1000,     Loopback:                        NONE
Duplex:                FULL,     Negotiation:                  ENABLE
Input Flow-control: DISABLE,     Output Flow-control:          DISABLE
Mdi:                      -,     Fec:                                -
Last physical up time   : 2026-01-14 03:20:00+08:00

发现接口类型为 电口

Port Mode:     COMMON COPPER,     Port Split/Aggregate:               -

实际用的是光口，
查询发现是光电复用口，长这样

需要命令切换为光口

interface GE0/0/6
 combo enable fiber

执行完成后，再show，显示为fiber了，但接口仍无法Up

HRP_M[USG6555F]   dis int g 0/0/6
2026-01-14 18:48:28.359 +08:00
GE0/0/6 current state : DOWN (ifindex: 12)
Line protocol current state : DOWN 
Last line protocol up time : 2026-01-14 03:20:00+08:00
Description: 
Route Port,The Maximum Transmit Unit is 1500,The Maximum Frame Length is 9216
Internet Address is 10.18.200.252/26
IP Sending Frames' Format is PKTFMT_ETHNT_2, Hardware address is 2426-d6a4-1cd8
Port Mode:     COMMON FIBER,     Port Split/Aggregate:               -
Speed:                 1000,     Loopback:                        NONE
Duplex:                FULL,     Negotiation:                  DISABLE

再次查询，发现usg的接口下启用了自动协商 ，而对端交换机是关闭了自动协商，
会不会是这个原因

在USG的接口下关闭了自动协商 ，端口正常Up了。
命令如下：

interface GE0/0/6
 negotiation disable

最终接口状态

2026-01-14 18:53:54.884 +08:00
GE0/0/6 current state : UP (ifindex: 12)
Line protocol current state : UP 
Last line protocol up time : 2026-01-14 03:20:00+08:00
Description: 
Route Port,The Maximum Transmit Unit is 1500,The Maximum Frame Length is 9216
Internet Address is 10.18.200.252/26
IP Sending Frames' Format is PKTFMT_ETHNT_2, Hardware address is 2426-d6a4-1cd8
Port Mode:     COMMON FIBER,     Port Split/Aggregate:               -
Speed:                 1000,     Loopback:                        NONE
Duplex:                FULL,     Negotiation:                  DISABLE
Input Flow-control: DISABLE,     Output Flow-control:          DISABLE