Loop Avoidance Method, Device and System

摘要

A loop avoidance method, device and system. The system includes a first network device and a second network device in an internal network, a first Ethernet port and a second Ethernet port of the two network devices are of a first type, and loop avoidance priorities of the Ethernet ports are different from each other; root media access control (MAC) addresses of the two network devices are the same, and are different from respective network bridge MAC addresses; the second network device receives a loop detection frame from the first Ethernet port through the second Ethernet port, where a source address of the loop detection frame is the root MAC address, and blocks the second Ethernet port according to the loop avoidance priority. A network device blocks, according to a loop avoidance priority, an Ethernet port connected to an external network to avoid changing a topology of an internal network.

主权项

1. A loop avoidance system, comprising:
a first network device; and a second network device, wherein the first network device and the second network device are both in an internal network, wherein the internal network is a network whose topology is ensured to be loop-free, wherein a type of a first Ethernet port of the first network device is a first type, wherein a loop avoidance priority of the first Ethernet port is a first loop avoidance priority, wherein a root media access control (MAC) address of the first network device and a network bridge MAC address of the first network device are different, wherein a type of a second Ethernet port of the second network device is the first type, wherein a loop avoidance priority of the second Ethernet port is a second loop avoidance priority, wherein a root MAC address of the second network device and a network bridge MAC address of the second network device are different, wherein the root MAC address of the second network device is the same as the root MAC address of the first network device, wherein the first network device is configured to send a loop detection frame using the first Ethernet port, wherein the loop detection frame comprises the first loop avoidance priority, wherein a source address of the loop detection frame is the root MAC address of the first network device, wherein the second network device is configured to receive the loop detection frame using the second Ethernet port and block the second Ethernet port when the first loop avoidance priority is higher than the second loop avoidance priority, and wherein the second network device is further configured to discard the loop detection frame.