Why is the subnet in an abnormal status

If the STP status on an AR router is abnormal, follow the procedure below for fault locating: 1. Check configuration of different interfaces. 2. Run the debug stp packet command to check STP packet receiving/transmission status on different interfaces. 3. If the fault cannot be located, collect logs, alarms, and debug information that are generated when the fault occurred, and contact Huawei engineers.

To solve the problem that the OSPF status between the firewall and the peer device cannot reach the Full state, perform the following steps: 1. Check the OSPF status. Check whether the OSPF neighboring relationship can be established between the firewall and the peer device. 2. If no, check the security policy configuration. Check whether the security policy control function for unicast packets is enabled. That is, check whether the firewall packet-filter basic-protocol enable command is configured. If yes, run the undo firewall packet-filter basic-protocol enable command to disable the function. To establish an OSPF neighboring relationship, devices need to exchange DD packets. DD packets are OSPF unicast packets. By default, the forwarding of OSPF unicast packets is not controlled by security policies. However, if you run the firewall packet-filter basic-protocol enable command to enable the security policy control function for OSPF unicast packets, you need also to configure the corresponding security policy to allow the packets to be forwarded. For details, see OSPF can not step into full state caused by security policy deny.

When the MSTP status of a WLAN device is abnormal, perform the following operations to locate the fault: 1. Check whether configurations on each interface of the device are correct. The configurations of interfaces in the same MST domain must be the same. 2. Run the debugging stp [ interface interface-type interface-number ] packet { all | send | receive } command to check whether each interface properly sends and receives STP packets. 3. If the fault persists, collect log, alarm, and debugging information, and contact Huawei technical personnel.

1. Check whether the network segment of the MRS board is 168.168.0.10. 2. Run the show inner network command on the main control board to query the network segment of the board. 3. If the network segment of the MRS board is inconsistent with the internal network segment of the main control board, run the config inner network ip XXXX command to change the network segment of the MRS board to 168***, and then restart the U1900.