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The Network Is Disconnected After the NX110 Restarts

Publication Date:  2015-06-25 Views:  220 Downloads:  0

Issue Description

Hardware configuration:
An NX110


The E6000 NX110 in slot A1 connects to an external switch (Alcatel). The NX110 has two virtual local area networks (VLANs): VLAN 5 and VLAN 20. The VLAN 20 network cable connects to port G0/16, and the VLAN 5 network cable connects to port G0/23, as shown in Figure 1.

Figure 1 NX110 networking

A power failure occurred. After the power supply is recovered, and a network cable is connected to port G0/23 on the NX110, ports in VLAN 20 cannot communicate with external networks. If port G0/16 or G0/23 is separately connected, the communication is normal.

Handling Process

1.  At the site, the Spanning Tree Protocol (STP) function is disabled for all switch modules because the STP used by the NX110 conflicts with the STP used by the upper-layer switch (Alcatel).

2.  After the STP function is disabled, the NX110 configuration is not saved and is lost after the power failure. As a result, the network is disconnected.

3.  Disable the STP function and save the configuration. The problem is solved.

Root Cause

After the STP function is enabled for the NX110, the NX110 is not compatible with the upper-layer switch. As a result, the network is disconnected. The modified NX110 configuration is not saved. As a result, the configuration is lost after a restart.


If the NX110 uses the STP that is not compatible with that of the upper-layer switch, you can disable the STP function or use other solutions. After the NX110 configuration is modified, save the configuration to make the configuration effective after next startup. To save the configuration, run the save command in the user view.


When the NX110 is powered on, the NX110 system reads the configuration file from the flash memory and initializes the NX110. If no configuration file is found in the flash memory, the OS initializes the NX110 based on default parameters. To use the current configuration as the initial configuration of the next power-on, run the save command to save the current configuration to the flash memory.