Communication method, device and system for avoiding loop

A technology of communication equipment and communication methods, applied in the field of communication, can solve problems such as loop problems, and achieve the effect of avoiding transmission loop problems
CN110661701AActive Publication Date: 2020-01-07HUAWEI TECH CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
HUAWEI TECH CO LTD
Publication Date
2020-01-07

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Abstract

The invention provides a communication method, device and system for avoiding a loop. The invention discloses a communication method. The first PE device sends a first identifier to the second PE device through the first interface, then, the first PE equipment receives a data packet which is sent by the second PE equipment and comprises a first identifier through the first interface; and then thefirst PE device determines that a second interface associated with the first identifier is in a fault state, and in response to determining that the second interface is in the fault state, the first PE device avoids sending a data packet to the second PE device via the first interface, and the second interface is an interface of the first PE device for connecting the CE device. Through the schemeprovided by the invention, a loop can be avoided.
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Description

technical field

[0001] The present application relates to the communication field, and in particular to a communication method, device and system for avoiding loops. Background technique

[0002] Ethernet virtual private network (ethernet virtual private network, EVPN) provides an all-active mode. In the all-active mode, when a device is multi-homed to multiple provider edges , PE) device, the multiple PE devices can forward traffic to the device. When the multiple PE devices refer to two PE devices, the aforementioned multi-active mode may also be called a dual-active mode, and the aforementioned multi-homing may also be called dual-homed.

[0003] In the EVPN active-active mode, when the interfaces connecting the two PE devices to the customer edge (CE) device are both in a fault state, a loop problem will be caused. For example, if figure 1 As shown in the figure, CE equipment CE1 is dual-homed to PE equipment PE1 and PE2, and PE1 and PE2 are in the active-active mode....

Claims

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