IP Address Collision Detection

This feature is introduced in UMG8900 V200R008C02.

With the IP address collision detection function, the UMG8900 can detect conflict IP addresses in a LAN, thus minimizing service interruption caused by IP address conflict.

This feature can prevent a carrier from setting conflicting IP addresses during O&M, and detect IP address collision, thus avoiding service loss caused by status abnormality or unavailability of ports as a result of conflicting IP addresses.

Description: With the IP address collision detection function, the UMG8900 can detect conflict IP addresses in a LAN, thus minimizing service interruption caused by IP address conflict. An IP address conflict check can be implemented in two modes, active detection and passive monitoring, which differ in validity time. In active detection mode, an IP address is checked for possible conflicts before it is enabled,when a new IP interface and IP address are configured, or when a new IP address is added to an existing interface. If this IP address is the same as an existing IP address, this IP address

will not be enabled. If an IP address conflict is detected, an alarm is generated and the IP address is set to be invalid on the UMG8900.

In passive monitoring mode, the UMG8900 checks whether any IP address in the monitored network conflicts with an IP address locally configured. If an IP address conflict is detected, an alarm is generated, and the UMG8900 sends gratuitous Address Resolution Protocol (ARP) packets to mask the remote conflicted IP addresses. The UMG8900 stops sending gratuitousARP packets when no IP address conflict is detected. Then, the alarm is cleared.