Patent ID: 10003524

Abstract:
A routing loop determining method and a device. The method includes: acquiring, by a forwarding device in a layer 3 network, a first packet, where a time to live (TTL) value of the first packet is reduced to 0 by the forwarding device; acquiring, by the forwarding device, a second packet whose destination Internet Protocol IP address is the same as that of the first packet; recording, by the forwarding device, a feature of the second packet; forwarding, by the forwarding device, the second packet; and acquiring, by the forwarding device, a third packet according to the feature of the second packet, where a feature of the third packet is the same as that of the second packet, and determining that a routing loop exists. The present disclosure resolves a problem that a loop in a layer 3 network cannot be detected, and improves accuracy of sending a packet.