Usg5500 adopts double export uplink, one points to Netcom router, another points to Telecom router, Netcom router can communicate with other side equipment normally after the equipment was cut over online. But it cannot ping the Telecom router. The communication to other side recovered normally after 10 minutes.
1. Connect PC to Usg5500 interface directly, it can ping Usg5500 interface address normally, exclude the problem of interface and configuration.
2. The communication to other side recovered normally after 10 minutes without any alterability. It is doubted that the ARP aging time on other side router is too long, contact the operator to clear arp table, test again, can ping.
3. Configure gratuitous-arp send enable at interface if you cannot contact with operator, send free arp packets to other side, make other side to refresh the arp information, update the arp table on the other side equipment fast.
Usg5500 interface hardware problem
Usg5500 interface configuration problem
Other side equipment problem
ARP aging time problem