Need I re-establish a cluster when the gateway of VCN3020 is changed?

If an AR is used as a user access device (the WAN interface of the router is connected to the Internet, and the LAN interface is connected to an intranet), you are advised to disable STP to avoid network flapping due to STP convergence.

Possible causes are: -DHCP is not enabled globally using the dhcp enable command in the system view. -The address pool is not configured using the dhcp select interface or dhcp select global command in the interface view. -The dhcp select global command in executed in the interface view, but the global address pool is incorrectly configured. -Wireless users use MAC address authentication, but no MAC address is configured for the users on the authentication server.

No. IP addresses need to be planned only for new nodes.

You can apply for a cluster license in either of the following ways: 1. Provide the ESN of the master server to apply for a cluster license. However, if the master server is faulty, cluster members cannot be added. 2. Provide ESNs of all servers, including the master and slave servers, to apply for a cluster license and import the license into each server. If the master server is faulty, cluster members can still be added.