NE20E-S16对接S5700交换机光口协商不一致导致链路一端UP一端Down

组网描述：客户在局点B出新增一台NE20E通过局点A处的华为S5700交换机与外网联通。

1、在NE20E侧ping网关地址不通

[~GanZhi-RT-NE20E-aaa]ping 113.0.40.81
  PING 113.0.40.81: 56  data bytes, press CTRL_C to break
    Request time out
    Request time out
    Request time out
    Request time out
    Request time out

  --- 113.0.40.81 ping statistics ---
    5 packet(s) transmitted
    0 packet(s) received
    100.00% packet loss

2、在ne20E侧查看接口状态为up，收发光均在正常阈值内，line protocol up。

[~GanZhi-RT-NE20E]dis int gi 0/5/3      
GigabitEthernet0/5/3 current state : UP (ifindex: 19)
Line protocol current state : UP
Last line protocol up time : 2019-11-26 17:12:15
Link quality grade : GOOD
Description:
Route Port,The Maximum Transmit Unit is 1500
Internet Address is 113.0.40.88/28
IP Sending Frames' Format is PKTFMT_ETHNT_2, Hardware address is cc64-a6bb-ee1e
The Vendor PN is SFP-BX-D20D
The Vendor Name is HUAWEI
Port BW: 1G, Transceiver max BW: 1G, Transceiver Mode: SingleMode
WaveLength: 1550nm, Transmission Distance: 20km
Rx Power: -19.06dBm, Warning range: [-24.202,  -3.000]dBm
Tx Power:  -6.05dBm, Warning range: [-9.500,  -3.000]dBm
Loopback: none, full-duplex mode, negotiation: disable, Pause Flowcontrol: Receive Enable and Send Enable
Last physical up time   : 2019-11-26 15:54:41
Last physical down time : 2019-11-18 09:48:52
Current system time: 2019-11-26 17:18:45
Statistics last cleared:never
    Last 300 seconds input rate: 0 bits/sec, 0 packets/sec
    Last 300 seconds output rate: 91 bits/sec, 0 packets/sec
    Input peak rate 0 bits/sec, Record time: -
    Output peak rate 511 bits/sec, Record time: 2019-11-18 09:55:40
    Input: 0 bytes, 0 packets
    Output: 92113 bytes, 275 packets
    Input:
      Unicast: 0 packets, Multicast: 0 packets
      Broadcast: 0 packets, JumboOctets: 0 packets
      CRC: 0 packets, Symbol: 0 packets
      Overrun: 0 packets, InRangeLength: 0 packets
      LongPacket: 0 packets, Jabber: 0 packets, Alignment: 0 packets
      Fragment: 0 packets, Undersized Frame: 0 packets
      RxPause: 0 packets
    Output:
      Unicast: 0 packets, Multicast: 173 packets
      Broadcast: 102 packets, JumboOctets: 0 packets
      Lost: 0 packets, Overflow: 0 packets, Underrun: 0 packets
      System: 0 packets, Overruns: 0 packets
      TxPause: 0 packets
    Last 300 seconds input utility rate:  0.00%
    Last 300 seconds output utility rate: 0.01%

3、查看ARP无对端设备arp表项

[~GanZhi-RT-NE20E-aaa]dis arp all                                          
IP ADDRESS      MAC ADDRESS     EXPIRE(M) TYPE        INTERFACE   VPN-INSTANCE 
                                          VLAN/CEVLAN PVC 
---------------------------------------------------------------------------------------- 
10.201.0.1      084f-0ac7-d461            I -         GE0/3/0          
10.201.0.2      d0c6-5ba5-2fd2  5         D-17        GE0/3/0          
113.0.40.88     cc64-a6bb-ee1e            I -         GE0/5/3          
---------------------------------------------------------------------------------------- 
Total:3         Dynamic:1       Static:0    Interface:2    Remote:0 
Redirect:0 

4、lldp看不到对端邻居信息

<GanZhi-RT-NE20E>dis lldp nei brief    
Local Intf              Neighbor Dev         Neighbor Intf        Exptime (sec)
-------------------------------------------------------------------------------
GigabitEthernet0/3/0    USG6600              GigabitEthernet1/0/0           120

5、去局点A侧查看S5700端口状态

S5700侧通过LLDP看不到邻居信息

[Quidway]dis lldp nei bri 

Local Intf   Neighbor Dev             Neighbor Intf             Exptime
GE0/0/48     HEB_CON-S_ZS_HUAWEI-S... GE2/0/11                  111   

查看接口发现接口为down状态，速率为10M，半双工

查看端口收发光，均在正常阈值内，说明模块与链路无问题

NE20E侧端口自动协商为关闭状态，S5700交换机侧端口自动协商为开启状态，导致此问题

在S5700侧关闭自动协商功能

interface GigabitEthernet0/1/1 

undo negotiation auto

端口状态变为UP，可以lldp可以看到邻居设备信息

[Quidway-GigabitEthernet0/1/1]dis lldp nei brief 
Local Intf   Neighbor Dev             Neighbor Intf             Exptime 
GE0/0/48     HEB_CON-S_ZS_HUAWEI-S... GE2/0/11                  102    
GE0/1/1      GanZhi-RT-NE20E          GE0/5/3                   101    

局点B侧NE20E可以ping通网关。