S9706交换机跟NE40E路由器GE端口对接无法up

S9706交换机跟NE40E路由器通过GE光口对接，NE40E侧端口能正常up但S9706上的端口始终down

1、物理端口对接无法up首先查看设备端口是否undo shutdown，检查S9706和NE40E的端口都已经undo shutdown；

 

2、检查设备两端的收发光是否正常，通过display interface gigabitethernet x/x/x命令查看NE40E上的端口收发光正常，通过display transceiver interface gigabitethernet x/x/x verbose命令查看S9706上的端口收发光也在正常范围内；

 

3、尾纤是否跳成鸳鸯纤，收发不一致？在S9706关闭端口检查NE40E的收光发现收光-40db，属于自然光，说明NE40E原来确实是收到S9706上的光，同样道理在NE40E上关闭端口检查S9706上的端口收光也发现没有了收光，排查鸳鸯纤的问题；

 

4、检查NE40E的端口状态发现NE40E上的端口协商方式为强制全双工模式

 

<NE40E> display interface gigabitethernet 1/0/1

GigabitEthernet1/0/1 current state : UP 

Line protocol current state : down 

Last line protocol up time : 2018-01-11 12:02:07

Link quality grade : GOOD

Description: HUAWEI, Quidway Series, GigabitEthernet1/0/1 Interface

Route Port,The Maximum Transmit Unit is 1500 

Internet Address is 10.1.1.1/1

IP Sending Frames' Format is PKTFMT_ETHNT_2, Hardware address is 4c1f-cc9e-295f

LCP opened LCP Magic-nubmer Check Error Times ：0 ;

The Vendor PN is FTLF1321P1BTL-HW

The Vendor Name is FINISAR CORP.   

Port BW: 1G, Transceiver max BW: 2.5G, Transceiver Mode: SingleMode

WaveLength: 1310nm, Transmission Distance: 2km

Rx Power:  -8.63dBm, normal range: [-15.003,  -5.999]dBm

Tx Power:  -3.79dBm, normal range: [-10.000,  -2.999]dBm

Loopback:none, full-duplex mode, negotiation: disable, Pause Flowcontrol:Receive Enable and Send Enable

而S9706的端口协商方式为自协商

GigabitEthernet6/0/21 current state : Administratively DOWN

Line protocol current state : DOWN

Description:

Switch Port, PVID :    1, TPID : 8100(Hex), The Maximum Frame Length is 9216

IP Sending Frames' Format is PKTFMT_ETHNT_2, Hardware address is 0025-9e55-4e0e

Last physical up time   : -

Last physical down time : 2017-03-30 01:17:25 UTC-08:00

Current system time: 2018-1-11 12:02:35-08:00

Port Mode: COMMON FIBER

Speed : 1000,  Loopback: NONE

Duplex: FULL,  Negotiation: ENABLE

Mdi   : NORMAL

 

5、设备两端的协商方式不一致，将NE40E的端口协商方式改为自协商后S9706的端口能正常up。

设备两端的端口协商方式不一致导致物理端口单通

将NE40E的端口协商方式改为自协商后正常

interface gigabitethernet 1/0/1

negotiation auto

S9700交换机的GE光口模式默认协商方式为自协商，而NE40E路由器的GE光口模式默认为非自协商，当两种不同类型的以太网光口对接时需要保持设备两端的端口协商方式一致，两端都设置为自协商或者都设置为非自协商，不能一端设置为自协商而另一端设置为非自协商